From b61452865bb23354a1ec33e349757f388e74f691 Mon Sep 17 00:00:00 2001
From: Gui ze yu <2970307356@qq.com>
Date: Tue, 30 May 2023 22:11:05 +0800
Subject: [PATCH 1/3] study

---
 .../2023-05-29\344\275\234\344\270\232.md"    | 378 ++++++++++++++++++
 1 file changed, 378 insertions(+)
 create mode 100644 "09 \346\241\202\346\263\275\347\205\234/2023-05-29\344\275\234\344\270\232.md"

diff --git "a/09 \346\241\202\346\263\275\347\205\234/2023-05-29\344\275\234\344\270\232.md" "b/09 \346\241\202\346\263\275\347\205\234/2023-05-29\344\275\234\344\270\232.md"
new file mode 100644
index 0000000..29f2409
--- /dev/null
+++ "b/09 \346\241\202\346\263\275\347\205\234/2023-05-29\344\275\234\344\270\232.md"	
@@ -0,0 +1,378 @@
+```mysql
+create database band_db charset=utf8;
+use band_db;
+create table band(
+ id int  primary key auto_increment,
+name varchar(30),
+enterprisename varchar(30),
+introduction varchar(50),
+state int default 1 comment'状态:0禁用1启用'
+)comment'品牌';
+insert into band 
+values 
+(1,'三只松鼠','三只松鼠','三只松鼠,好吃不上火',1),
+(2,'优衣库','优衣库','优衣库,服适人生',0),
+(3,'小米','小米科技有限公司','为发烧而生',1);
+```
+
+```java
+package com.dao;
+
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.SQLException;
+
+public class Dao {
+ private Connection conn;
+ private String driver = "com.mysql.jdbc.Driver";
+ private String url ="jdbc:mysql://localhost:3306/band_db?useSSL=false&useUnicode=true&charsetEnding=utf8";
+ private String user="root";
+ private String password="root";
+
+    public Dao() {
+        try {
+            Class.forName(driver);
+            System.out.println("驱动加载成功");
+        } catch (ClassNotFoundException e) {
+            System.out.println("驱动加载失败!");
+            throw new RuntimeException(e);
+        }
+    }
+
+    public Connection getConn() {
+        try {
+            conn = DriverManager.getConnection(url,user,password);
+            System.out.println("数据库连接成功");
+        } catch (SQLException e) {
+            System.out.println("数据库连接失败！");
+            throw new RuntimeException(e);
+        }
+        return conn;
+    }
+
+    public void setConn(Connection conn) {
+        this.conn = conn;
+    }
+}
+
+```
+
+```java
+package com.band;
+
+public class Band {
+    //序号
+    private int id;
+    //品牌名称
+    private String name;
+    //企业名称
+    private String enterprisename;
+    //品牌介绍
+    private String interoduction;
+   //状态
+    private String state;
+    public Band() {
+    }
+
+    public Band(int id, String name, String enterprisename, String interoduction, String state) {
+        this.id = id;
+        this.name = name;
+        this.enterprisename = enterprisename;
+        this.interoduction = interoduction;
+        this.state = state;
+    }
+
+    public int getId() {
+        return id;
+    }
+
+    public void setId(int id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getEnterprisename() {
+        return enterprisename;
+    }
+
+    public void setEnterprisename(String enterprisename) {
+        this.enterprisename = enterprisename;
+    }
+
+    public String getInteroduction() {
+        return interoduction;
+    }
+
+    public void setInteroduction(String interoduction) {
+        this.interoduction = interoduction;
+    }
+
+    public String getState() {
+        return state;
+    }
+
+    public void setState(String state) {
+        this.state = state;
+    }
+}
+```
+
+```java
+package com.servlet;
+
+import com.band.Band;
+import com.dao.Dao;
+
+
+import javax.servlet.ServletException;
+import javax.servlet.annotation.WebServlet;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import java.io.IOException;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+
+@WebServlet(name = "Servlet", value = "/Servlet")
+public class Servlet extends HttpServlet {
+    @Override
+    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+        response.setContentType("text/html;charset=utf-8");
+        request.setCharacterEncoding("utf-8");
+        System.out.println("你调用了get方法");
+        String mess = request.getParameter("submit");
+        if (mess.endsWith("查询")) {
+            Find(request, response);
+        }
+        if (mess.endsWith("添加")) {
+            Add(request, response);
+        }
+        if(mess.endsWith("修改")){
+            Update(request,response);
+        }
+    }
+
+    //查询
+    public void Find(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+        String id = request.getParameter("id");
+        String name = request.getParameter("name");
+        String enterprisename = request.getParameter("enterprisename");
+        String introduction = request.getParameter("introduction");
+        String state = request.getParameter("state");
+        Band band = new Band();
+        Dao dao = new Dao();
+        String sql = "select * from band where id=? and name=? and enterprisename=? and introduction=? and state=?";
+        try {
+            PreparedStatement pre = dao.getConn().prepareStatement(sql);
+            pre.setString(1, id);
+            pre.setString(2, name);
+            pre.setString(3, enterprisename);
+            pre.setString(4,introduction);
+            pre.setString(5,state);
+            ResultSet res = pre.executeQuery();
+            while (res.next()) {
+                id = res.getString("id");
+                name = res.getString("name");
+                enterprisename = res.getString("enterprisename");
+                introduction = res.getString("introduction");
+                state = res.getString("state");
+                band.setId(Integer.parseInt(id));
+                band.setName(name);
+                band.setEnterprisename(enterprisename);
+                band.setInteroduction(introduction);
+                band.setState("state");
+                response.getWriter().write(String.valueOf(band));
+            }
+            res.close();
+        } catch (SQLException e) {
+        }
+    }
+
+    //添加
+    public void Add(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+        String id = request.getParameter("id");
+        String name = request.getParameter("name");
+        String enterprisename = request.getParameter("enterprisename");
+        String introduction = request.getParameter("introduction");
+        String state = request.getParameter("state");
+        Band band = new Band();
+        Dao dao = new Dao();
+        String sql = "insert into band values(?,?,?,?,?)";
+        try {
+            PreparedStatement pre = dao.getConn().prepareStatement(sql);
+            pre.setString(1, id);
+            pre.setString(2, name);
+            pre.setString(3, enterprisename);
+            pre.setString(4,introduction);
+            pre.setString(5,state);
+            int i = pre.executeUpdate();
+            if (i > 0) {
+                band.setId(Integer.parseInt(id));
+                band.setName(name);
+                band.setEnterprisename(enterprisename);
+                band.setInteroduction(introduction);
+                band.setState(state);
+                System.out.println(band);
+                response.getWriter().write("添加成功");
+            } else response.getWriter().write("添加失败");
+            pre.close();
+        } catch (SQLException e) {
+        }
+    }
+    //修改
+public void Update(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+    String id = request.getParameter("id");
+    String name = request.getParameter("name");
+    String enterprisename = request.getParameter("enterprisename");
+    String introduction = request.getParameter("introduction");
+    String state = request.getParameter("state");
+    Band band = new Band();
+    Dao dao = new Dao();
+    String sql = "update band set name=?,enterprisename=?,introduction=?,state=?  where id=?";
+    try {
+        PreparedStatement pre = dao.getConn().prepareStatement(sql);
+        pre.setString(1, name);
+        pre.setString(2,enterprisename);
+        pre.setString(3,introduction);
+        pre.setString(4,state);
+        pre.setString(5,id);
+        int i = pre.executeUpdate();
+        if (i > 0) {
+            band.setId(Integer.parseInt(id));
+            band.setName(name);
+            band.setEnterprisename(enterprisename);
+            band.setInteroduction(introduction);
+            band.setState(state);
+            response.getWriter().write("修改成功");
+        } else response.getWriter().write("修改失败");
+        pre.close();
+    } catch (SQLException e) {
+    }
+}
+    @Override
+    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+        doGet(request, response);
+    }
+}
+
+```
+
+```java
+<%@ page import="com.dao.Dao" %>
+<%@ page import="java.sql.PreparedStatement" %>
+<%@ page import="java.sql.ResultSet" %>
+<%@ page import="java.sql.SQLException" %>
+<%@ page import="com.band.Band" %>
+<%@ page import="javax.xml.crypto.dsig.spec.XSLTTransformParameterSpec" %><%--
+  Created by IntelliJ IDEA.
+  User: MAC
+  Date: 2023/5/27
+  Time: 18:18
+  To change this template use File | Settings | File Templates.
+--%>
+<%@ page contentType="text/html;charset=UTF-8" language="java" %>
+<html>
+<head>
+  <title>主页</title>
+</head>
+<style>
+  table,tr,th{
+    border-collapse: collapse;
+    text-align: center;
+    width: 300px;
+  border: 1px dashed}
+</style>
+<body>
+<table>
+  <tr><th>序号</th><th>品牌名称</th><th></th><th>企业名称</th><th>品牌名称</th><th>状态</th><th>操作</th></tr>
+  <%
+    Band band = new Band();
+    Dao dao = new Dao();
+    String sql = "select * from band;";
+    try {
+      PreparedStatement pre = dao.getConn().prepareStatement(sql);
+      ResultSet res = pre.executeQuery();
+      while (true) {
+        try {
+          if (!res.next()) break;
+        } catch (SQLException e) {
+          throw new RuntimeException(e);
+        }
+      }
+      String id = res.getString("id");
+       String  name = res.getString("name");
+       String enterprisename = res.getString("enterprisename");
+        String introduction = res.getString("introduction");
+      String  state = res.getString("state");
+        band.setId(Integer.parseInt(id));
+        band.setName(name);
+        band.setEnterprisename(enterprisename);
+        band.setInteroduction(introduction);
+        band.setState("state");
+  %>
+  <tr>
+  <td><%=band.getId()%></td><td><%=band.getName()%></td><td><%=band.getEnterprisename()%></td>
+    <td><%=band.getInteroduction()%></td><td><%=band.getState()%></td>
+  <td><a href="update.jsp?id=<%=id%>">修改</a>&nbsp<a href="delete.jsp?id=<%=id%>">删除</a></td>
+</tr>
+  <%res.close();} catch (SQLException e) {}%>
+</table>
+</body>
+</html>
+
+```
+
+```java
+<%@ page import="com.student.Student" %>
+<%@ page import="com.dao.Dao" %>
+<%@ page import="java.sql.PreparedStatement" %>
+<%@ page import="java.sql.ResultSet" %>
+<%@ page import="java.sql.SQLException" %>
+<%@ page import="com.band.Band" %><%--
+  Created by IntelliJ IDEA.
+  User: MAC
+  Date: 2023/5/27
+  Time: 22:48
+  To change this template use File | Settings | File Templates.
+--%>
+<%@ page contentType="text/html;charset=UTF-8" language="java" %>
+<html>
+<head>
+    <title>删除学生</title>
+</head>
+<body>
+<%String id = request.getParameter("id");
+  Band band = new Band();
+  Dao dao = new Dao();
+  String sql = "delete from band where id=?";
+  try {
+    PreparedStatement pre = dao.getConn().prepareStatement(sql);
+    pre.setString(1, id);
+    int i = pre.executeUpdate();
+    if (i > 0) {
+      response.getWriter().write("<script>alert('删除成功！')</script>");
+      response.sendRedirect("index.jsp");
+      request.setAttribute("band",band);
+    } else response.getWriter().write("删除失败");
+    pre.close();
+  } catch (SQLException e) {
+  }%>
+<%  band = (Band) request.getAttribute("band");%>
+<form action="Servlet" method="post">
+  <h1>删除学生</h1>
+  <input type="hidden" name="id" value="<%=band.getId()%>"><br>
+  <input type="submit" name="submit" value="删除">
+</form>
+</body>
+</html>
+
+```
+
-- 
Gitee


From e637e94b2cd26e1c8fdd61d84faa98e92713ed86 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E6=A1=82=E6=B3=BD=E7=85=9C?=
 <11435691+islover@user.noreply.gitee.com>
Date: Tue, 30 May 2023 14:25:18 +0000
Subject: [PATCH 2/3] =?UTF-8?q?=E5=88=A0=E9=99=A4=E6=96=87=E4=BB=B6=2009?=
 =?UTF-8?q?=20=E6=A1=82=E6=B3=BD=E7=85=9C?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 ...BC\344\275\234\344\270\232\357\274\232.md" | 231 -----------
 ...41\347\220\206\347\263\273\347\273\237.md" | 177 --------
 ...3-05-22tomcat \344\275\234\344\270\232.md" | 213 ----------
 .../2023-05-24\344\275\234\344\270\232.md"    | 251 ------------
 .../2023-05-27\344\275\234\344\270\232.md"    | 360 -----------------
 .../2023-05-29\344\275\234\344\270\232.md"    | 378 ------------------
 6 files changed, 1610 deletions(-)
 delete mode 100644 "09 \346\241\202\346\263\275\347\205\234/2023-05-17JDBC\344\275\234\344\270\232\357\274\232.md"
 delete mode 100644 "09 \346\241\202\346\263\275\347\205\234/2023-05-20\345\255\246\347\224\237\347\256\241\347\220\206\347\263\273\347\273\237.md"
 delete mode 100644 "09 \346\241\202\346\263\275\347\205\234/2023-05-22tomcat \344\275\234\344\270\232.md"
 delete mode 100644 "09 \346\241\202\346\263\275\347\205\234/2023-05-24\344\275\234\344\270\232.md"
 delete mode 100644 "09 \346\241\202\346\263\275\347\205\234/2023-05-27\344\275\234\344\270\232.md"
 delete mode 100644 "09 \346\241\202\346\263\275\347\205\234/2023-05-29\344\275\234\344\270\232.md"

diff --git "a/09 \346\241\202\346\263\275\347\205\234/2023-05-17JDBC\344\275\234\344\270\232\357\274\232.md" "b/09 \346\241\202\346\263\275\347\205\234/2023-05-17JDBC\344\275\234\344\270\232\357\274\232.md"
deleted file mode 100644
index c8de46d..0000000
--- "a/09 \346\241\202\346\263\275\347\205\234/2023-05-17JDBC\344\275\234\344\270\232\357\274\232.md"	
+++ /dev/null
@@ -1,231 +0,0 @@
-### JDBC作业：
-
-1. MySQL中创建一个数据库student_db
-
-2. 库中创建student表
-
-3. 表中数据如下
-
-4. | 编号 | 姓名 | 性别 |
-   | ---- | ---- | ---- |
-   | 1    | 张三 | 男   |
-   | 2    | 李四 | 女   |
-   | 3    | 王五 | 男   |
-
-5. 编写java 4个类，分别实现以下功能
-
-   1. 查询功能，查询student中所有数据
-   2. 添加功能
-   3. 修改功能
-   4. 删除功能
-
-6. 扩展题【预习题】
-
-   1. 能否实现一个类中，用四个方法来实现上面4个类的功能
-   2. 能否实现将查询的结果，封装成java对象
-
-```java
-import com.mysql.cj.jdbc.Driver;
-
-import java.sql.Connection;
-import java.sql.DriverManager;
-import java.sql.SQLException;
-
-public class Conn {
-    Connection con;
-    public static String user;
-    public static String password;
-    public Connection getConnection(){
-        try{
-            Class.forName("com.mysql.cj.jdbc.Driver");
-            System.out.println("数据库驱动加载成功");
-        } catch (ClassNotFoundException e) {
-            e.printStackTrace();
-        }
-        user ="root";
-        password = "root";
-        try {
-            con = DriverManager.getConnection("jdbc:mysql://localhost:3306/student_db?useUnicode=true&characterEncoding=gbk",user,password);
-            System.out.println("数据库连接成功");
-        }catch (SQLException e){
-            e.printStackTrace();
-        }
-        return con;
-    }
-
-    public static void main(String[] args) {
-        Conn c = new Conn();
-        c.getConnection();
-    }
-}
-```
-
-```java
-import java.sql.*;
-
-public class JDBC {
-    static String url = "jdbc:mysql://localhost:3306/student_db?useUnicode=true&characterEncoding=utf8&useSSL=false";
-    static String username = "root";
-    static String password = "root";
-
-    public static void main(String[] args) {
-        try {
-            Class.forName("com.mysql.cj.jdbc.Driver");
-        } catch (ClassNotFoundException e) {
-            e.printStackTrace();
-        }
-        find();
-        add();
-        update();
-        delete();
-    }
-
-    static void find() {
-        Connection connection = null;
-        try {
-            connection = DriverManager.getConnection(url, username, password);
-        } catch (SQLException throwables) {
-            throwables.printStackTrace();
-        }
-        Statement statement = null;
-        try {
-            statement = connection.createStatement();
-        } catch (SQLException throwables) {
-            throwables.printStackTrace();
-        }
-        String sql = "SELECT * FROM STUDENT;";
-        ResultSet resultSet = null;
-        try {
-            resultSet = statement.executeQuery(sql);
-        } catch (SQLException throwables) {
-            throwables.printStackTrace();
-        }
-        while (true) {
-            try {
-                if (!resultSet.next()) break;
-            } catch (SQLException throwables) {
-                throwables.printStackTrace();
-            }
-            try {
-                System.out.println("id=" + resultSet.getInt("id"));
-            } catch (SQLException throwables) {
-                throwables.printStackTrace();
-            }
-            try {
-                System.out.println("name=" + resultSet.getString("name"));
-            } catch (SQLException throwables) {
-                throwables.printStackTrace();
-            }
-            try {
-                System.out.println("sex=" + resultSet.getString("sex"));
-            } catch (SQLException throwables) {
-                throwables.printStackTrace();
-            }
-        }
-        try {
-            resultSet.close();
-            connection.close();
-        } catch (SQLException throwables) {
-            throwables.printStackTrace();
-        }
-    }
-
-    static void add() {
-        Connection connection = null;
-        try {
-            connection = DriverManager.getConnection(url, username, password);
-        } catch (SQLException throwables) {
-            throwables.printStackTrace();
-        }
-        Statement statement = null;
-        try {
-            statement = connection.createStatement();
-        } catch (SQLException throwables) {
-            throwables.printStackTrace();
-        }
-        String sql2 = "INSERT INTO STUDENT VALUES (4,'柳长风','男');";
-        int i = 0;
-        try {
-            i = statement.executeUpdate(sql2);
-        } catch (SQLException throwables) {
-        }
-        System.out.println("添加了" + i + "条数据");
-        try {
-            statement.close();
-        } catch (SQLException throwables) {
-            throwables.printStackTrace();
-        }
-    }
-
-    static void update() {
-        Connection connection = null;
-        try {
-            connection = DriverManager.getConnection(url, username, password);
-        } catch (SQLException throwables) {
-            throwables.printStackTrace();
-        }
-        Statement statement = null;
-        try {
-            statement = connection.createStatement();
-        } catch (SQLException throwables) {
-            throwables.printStackTrace();
-        }
-        String sql3 = "UPDATE STUDENT SET NAME='张翰' WHERE ID =1;";
-        int s = 0;
-        try {
-            s = statement.executeUpdate(sql3);
-        } catch (SQLException throwables) {
-        }
-        System.out.println("更新了" + s + "条数据");
-        try {
-            statement.close();
-        } catch (SQLException throwables) {
-            throwables.printStackTrace();
-        }
-    }
-
-    static void delete() {
-        Connection connection = null;
-        try {
-            connection = DriverManager.getConnection(url, username, password);
-        } catch (SQLException throwables) {
-            throwables.printStackTrace();
-        }
-        Statement statement = null;
-        try {
-            statement = connection.createStatement();
-        } catch (SQLException throwables) {
-            throwables.printStackTrace();
-        }
-        String sql4 = "DELETE  FROM STUDENT WHERE ID =4";
-        int j = 0;
-        try {
-            j = statement.executeUpdate(sql4);
-        } catch (SQLException throwables) {
-        }
-        System.out.println("删除了" + j + "条数据");
-        try {
-            statement.close();
-        } catch (SQLException throwables) {
-            throwables.printStackTrace();
-        }
-    }
-}
-```
-
-```mysql
-create database student_db charset=utf8;
-use student_db;
-create table student(
-id int primary key auto_increment comment'编号',
-name varchar(20) comment'姓名',
-sex char(1) comment'性别'
-)comment'学生表';
-insert into student 
-values 
-(1,'张三','男'),
-(2,'李四','女'),
-(3,'王五','男');
-
-```
-
diff --git "a/09 \346\241\202\346\263\275\347\205\234/2023-05-20\345\255\246\347\224\237\347\256\241\347\220\206\347\263\273\347\273\237.md" "b/09 \346\241\202\346\263\275\347\205\234/2023-05-20\345\255\246\347\224\237\347\256\241\347\220\206\347\263\273\347\273\237.md"
deleted file mode 100644
index cd35f16..0000000
--- "a/09 \346\241\202\346\263\275\347\205\234/2023-05-20\345\255\246\347\224\237\347\256\241\347\220\206\347\263\273\347\273\237.md"	
+++ /dev/null
@@ -1,177 +0,0 @@
-```mysql
-create database student_db charset=utf8;
-use student_db;
-create table student(
-id int primary key auto_increment comment'编号',
-name varchar(20) comment'姓名',
-sex char(1) comment'性别'
-)comment'学生表';
-insert into student 
-values 
-(1,'张三','男'),
-(2,'李四','女'),
-(3,'王五','男');
-```
-
-```java
-import java.sql.*;
-import java.util.Scanner;
-
-public class studentmanagementsystem {
-    static Scanner scanner = new Scanner(System.in);
-
-    {
-        try {
-            Class.forName("com.mysql.cj.jdbc.Driver");
-        } catch (ClassNotFoundException e) {
-            throw new RuntimeException(e);
-        }
-        Connection connection = null;
-        try {
-            connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/student_db?useSSl=false&useUnicode=true&characterEncoding=utf8", "root", "root");
-        } catch (SQLException e) {
-            throw new RuntimeException(e);
-        }
-    }
-
-    public static void main(String[] args) {
-        studentmanagementsystem studentmanagementsystem = new studentmanagementsystem();
-        while (true) {
-            System.out.println("---学生管理系统---" +
-                    "\n---1.查询所有数据" +
-                    "\n---2.添加数据" +
-                    "\n---3.删除数据" +
-                    "\n---4.更新数据" +
-                    "\n---5.退出" +
-                    "\n请输入对应的数字");
-            int i = scanner.nextInt();
-            switch (i) {
-                case 1:
-                    find();
-                    break;
-                case 2:
-                    add();
-                    break;
-                case 3:
-                    delete();
-                    break;
-                case 4:
-                    update();
-                    break;
-                case 5:
-                    System.exit(0);
-            }
-        }
-
-    }
-
-    static void find() {
-        Connection connection = null;
-        String sql = "SELECT * FROM STUDENT;";
-        Statement statement = null;
-        ResultSet resultSet = null;
-        try {
-            connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/student_db?useSSl=false&useUnicode=true&characterEncoding=utf8", "root", "root");
-            statement = connection.prepareStatement(sql);
-            resultSet = statement.executeQuery(sql);
-        } catch (SQLException e) {
-            throw new RuntimeException(e);
-        }
-        while (true) {
-            try {
-                if (!resultSet.next()) break;
-                System.out.println("编号:" + resultSet.getString("id"));
-                System.out.println("姓名:" + resultSet.getString("name"));
-                System.out.println("性别:" + resultSet.getString("sex"));
-            } catch (SQLException e) {
-                throw new RuntimeException(e);
-            }
-        }
-        try {
-            resultSet.close();
-        } catch (SQLException e) {
-            throw new RuntimeException(e);
-        }
-    }
-
-    static void add() {
-        Connection connection = null;
-        System.out.println("请输入编号:");
-        String number = scanner.next();
-        System.out.println("请输入姓名:");
-        String name = scanner.next();
-        System.out.println("请输入性别:");
-        String sex = scanner.next();
-        String sql = "INSERT INTO student VALUES (?,?,?);";
-        int i = 0;
-        PreparedStatement statement=null;
-        try {
-            connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/student_db?useSSl=false&useUnicode=true&characterEncoding=utf8", "root", "root");
-            statement = connection.prepareStatement(sql);
-            statement.setString(1,number);
-            statement.setString(2,name);
-            statement.setString(3,sex);
-            i = statement.executeUpdate();
-        } catch (SQLException e) {
-            throw new RuntimeException(e);
-        }
-        System.out.println("添加了" + i + "条数据");
-        try {
-            statement.close();
-        } catch (SQLException e) {
-            throw new RuntimeException(e);
-        }
-    }
-
-    static void delete() {
-        Connection connection = null;
-        System.out.println("请输入你要删除的编号:");
-        String number = scanner.next();
-        String sql = "DELETE FROM STUDENT  WHERE id=?;";
-        PreparedStatement statement = null;
-        int i = 0;
-        try {
-            connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/student_db?useSSl=false&useUnicode=true&characterEncoding=utf8", "root", "root");
-            statement = connection.prepareStatement(sql);
-            statement.setString(1,number);
-            i = statement.executeUpdate();
-        } catch (SQLException e) {
-            throw new RuntimeException(e);
-        }
-        System.out.println("删除了" + i + "条数据");
-        try {
-            statement.close();
-        } catch (SQLException throwables) {
-            throwables.printStackTrace();
-        }
-    }
-
-    static void update() {
-        Connection connection = null;
-        System.out.println("请输入修改的姓名:");
-        String name = scanner.next();
-        System.out.println("请输入它的编号");
-        String number = scanner.next();
-        String sql = "UPDATE student set name=? where id = ?;";
-        PreparedStatement statement = null;
-        int i = 0;
-        try {
-            connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/student_db?useSSl=false&useUnicode=true&characterEncoding=utf8", "root", "root");
-            statement = connection.prepareStatement(sql);
-            statement.setString(1,name);
-            statement.setString(2,number);
-            i = statement.executeUpdate();
-        } catch (SQLException e) {
-            throw new RuntimeException(e);
-        }
-        System.out.println("更新了" + i + "条数据");
-        try {
-            statement.close();
-        } catch (SQLException throwables) {
-            throwables.printStackTrace();
-        }
-    }
-}
-
-```
-
diff --git "a/09 \346\241\202\346\263\275\347\205\234/2023-05-22tomcat \344\275\234\344\270\232.md" "b/09 \346\241\202\346\263\275\347\205\234/2023-05-22tomcat \344\275\234\344\270\232.md"
deleted file mode 100644
index 98527dc..0000000
--- "a/09 \346\241\202\346\263\275\347\205\234/2023-05-22tomcat \344\275\234\344\270\232.md"	
+++ /dev/null
@@ -1,213 +0,0 @@
-```markdown
-# 作业，
- * 1 数据库相关的操作，使用封装的工具类
- * 2 编写四个servlet，使用注解指定相关的访问路径，分别对应查询，修改，删除，添加的操作
- * 3 从浏览器中，访问这中个路径，显示响应的信息，查询显示结果，其它的显示成功或是失败
- * 4 预习题：如何通过浏览器传送请求参数给servlet，servlet如何接收这些参数，并使用这些参数，去影响数据库的操作？
-
-```
-
-```java
-package com.min.xin.Servlet;
-
-import javax.servlet.ServletException;
-import javax.servlet.annotation.WebServlet;
-import javax.servlet.http.HttpServlet;
-import javax.servlet.http.HttpServletRequest;
-import javax.servlet.http.HttpServletResponse;
-import javax.servlet.http.HttpSession;
-import java.io.IOException;
-import java.sql.*;
-
-@WebServlet("/Find")
-public class Find extends HttpServlet {
-    @Override
-    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
-    req.setCharacterEncoding("utf-8");
-    resp.setContentType("text/html;charset=utf-8");
-        {
-            try {
-                Class.forName("com.mysql.jdbc.Driver");
-                Connection connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/student_db?useSSL=false&useUnicode=true&charsetEnding=utf8", "root", "root");
-                int id = Integer.parseInt(req.getParameter("id"));
-                String name = req.getParameter("name");
-                String sex = req.getParameter("sex");
-                String sql = "select * from student where id=? and name=? and sex=?;";
-                PreparedStatement preparedStatement = connection.prepareStatement(sql);
-                ResultSet resultSet = preparedStatement.executeQuery(sql);
-                resp.getWriter().write("编号&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp姓名&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp性别" + "<br />");
-                while (resultSet.next()) {
-                     id = resultSet.getInt("id");
-                     name = resultSet.getString("name");
-                     sex = resultSet.getString("sex");
-                    resp.getWriter().write(id + "&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp" + name + "&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp" + sex + "<br />");
-                }
-                resultSet.close();
-            } catch (ClassNotFoundException | SQLException e) {
-                e.printStackTrace();
-            }
-        }
-    }
-
-    @Override
-    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
-doGet(req,resp);
-    }
-}
-
-```
-
-```java
-package com.min.xin.Servlet;
-
-import javax.servlet.ServletException;
-import javax.servlet.annotation.WebServlet;
-import javax.servlet.http.HttpServlet;
-import javax.servlet.http.HttpServletRequest;
-import javax.servlet.http.HttpServletResponse;
-import javax.servlet.http.HttpSession;
-import java.io.IOException;
-import java.sql.*;
-
-@WebServlet("/Update")
-public class Update extends HttpServlet {
-    @Override
-    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
-        {
-            try {
-                Class.forName("com.mysql.jdbc.Driver");
-                Connection connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/student_db?useSSL=false&useUnicode=true&charsetEnding=utf8", "root","root");
-                HttpSession httpSession = req.getSession(true);
-                String name = req.getParameter("name");
-                String id = req.getParameter("id");
-                String sql ="update student set name=? where id=?;";
-                PreparedStatement preparedStatement = connection.prepareStatement(sql);
-                preparedStatement.setString(1,name);
-                preparedStatement.setString(2,id);
-                int i = preparedStatement.executeUpdate(sql);
-                if(i >0){
-                    resp.getWriter().write("更新成功");
-                }else{
-                    resp.getWriter().write("更新失败");
-                }
-            } catch (ClassNotFoundException e) {
-                e.printStackTrace();
-            } catch (SQLException throwables) {
-                throwables.printStackTrace();
-            }
-        }
-    }
-
-    @Override
-    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
-doGet(req,resp);
-    }
-}
-
-```
-
-```java
-package com.min.xin.Servlet;
-
-import javax.servlet.ServletException;
-import javax.servlet.annotation.WebServlet;
-import javax.servlet.http.HttpServlet;
-import javax.servlet.http.HttpServletRequest;
-import javax.servlet.http.HttpServletResponse;
-import javax.servlet.http.HttpSession;
-import java.io.IOException;
-import java.sql.Connection;
-import java.sql.DriverManager;
-import java.sql.PreparedStatement;
-import java.sql.SQLException;
-
-@WebServlet("/Delete")
-public class Delete extends HttpServlet {
-    @Override
-    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
-        {
-            try {
-                Class.forName("com.mysql.jdbc.Driver");
-                Connection connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/student_db?useSSL=false&useUnicode=true&charsetEnding=utf8", "root","root");
-                HttpSession httpSession = req.getSession(true);
-                String id = req.getParameter("id");
-                String sql ="DELETE FROM STUDENT ID=?";
-                PreparedStatement preparedStatement = connection.prepareStatement(sql);
-                preparedStatement.setString(1,id);
-                int i = preparedStatement.executeUpdate(sql);
-                if(i >0){
-                    resp.getWriter().write("删除成功");
-                }else{
-                    resp.getWriter().write("删除失败");
-                }
-            } catch (ClassNotFoundException e) {
-                e.printStackTrace();
-            } catch (SQLException throwables) {
-                throwables.printStackTrace();
-            }
-        }
-
-    }
-
-    @Override
-    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
-doGet(req,resp);
-    }
-}
-
-```
-
-```java
-package com.min.xin.Servlet;
-
-import javax.servlet.ServletException;
-import javax.servlet.annotation.WebServlet;
-import javax.servlet.http.HttpServlet;
-import javax.servlet.http.HttpServletRequest;
-import javax.servlet.http.HttpServletResponse;
-import javax.servlet.http.HttpSession;
-import java.io.IOException;
-import java.sql.Connection;
-import java.sql.DriverManager;
-import java.sql.PreparedStatement;
-import java.sql.SQLException;
-
-@WebServlet("/Add")
-public class Add extends HttpServlet {
-    @Override
-    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
-        {
-            try {
-                Class.forName("com.mysql.jdbc.Driver");
-                Connection connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/student_db?useSSL=false&useUnicode=true&charsetEnding=utf8", "root","root");
-                HttpSession httpSession = req.getSession(true);
-                String id = req.getParameter("id");
-                String name = req.getParameter("name");
-                String sex = req.getParameter("sex");
-                String sql ="insert into student values(?,?,?);";
-                PreparedStatement preparedStatement = connection.prepareStatement(sql);
-                preparedStatement.setString(1,id);
-                preparedStatement.setString(2,name);
-                preparedStatement.setString(3,sex);
-                int i = preparedStatement.executeUpdate(sql);
-                if(i >0){
-                    resp.getWriter().write("添加成功");
-                }else{
-                    resp.getWriter().write("添加失败");
-                }
-            } catch (ClassNotFoundException e) {
-                e.printStackTrace();
-            } catch (SQLException throwables) {
-                throwables.printStackTrace();
-            }
-        }
-    }
-
-    @Override
-    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
-doGet(req,resp);
-    }
-}
-
-```
-
diff --git "a/09 \346\241\202\346\263\275\347\205\234/2023-05-24\344\275\234\344\270\232.md" "b/09 \346\241\202\346\263\275\347\205\234/2023-05-24\344\275\234\344\270\232.md"
deleted file mode 100644
index 53a6715..0000000
--- "a/09 \346\241\202\346\263\275\347\205\234/2023-05-24\344\275\234\344\270\232.md"	
+++ /dev/null
@@ -1,251 +0,0 @@
-```html
-<!DOCTYPE html>
-<html lang="en">
-<head>
-    <meta charset="UTF-8">
-    <title>学生管理系统</title>
-</head>
-<body>
-<form action="Servlet" method="post">
-    <h1>查询学生</h1>
-    输入你要查询的学生编号:<input type="text" name="id"><br>
-    输入你要查询的学生姓名:<input type="text" name="name"><br>
-    输入你要查询的学生性别:<input type="text" name="sex"><br>
-    <input type="submit" name="submit" value="查询">
-</form>
-<form action="Servlet" method="post">
-    <h1>添加学生</h1>
-    输入你要添加的学生编号:<input type="text" name="id"><br>
-    输入你要添加的学生姓名:<input type="text" name="name"><br>
-    输入你要添加的学生性别:<input type="text" name="sex"><br>
-    <input type="submit" name="submit" value="添加">
-</form>
-<form action="Servlet" method="post">
-    <h1>删除学生</h1>
-    输入你要删除的学生编号:<input type="text" name="id"><br>
-    <input type="submit" name="submit" value="删除">
-</form>
-<form action="Servlet" method="post">
-    <h1>修改学生</h1>
-    输入你要修改的学生编号:<input type="text" name="id"><br>
-    输入你要修改的学生姓名:<input type="text" name="name"><br>
-    <input type="submit" name="submit" value="修改">
-</form>
-</body>
-</html>
-```
-
-```java
-package com.dao;
-
-import java.sql.*;
-
-public class Dao {
- private Connection conn;
- private String driver = "com.mysql.jdbc.Driver";
- private String url ="jdbc:mysql://localhost:3306/student_db?useSSL=false&useUnicode=true&charsetEnding=utf8";
- private String user="root";
- private String password="root";
-
-    public Dao() {
-        try {
-            Class.forName(driver);
-            System.out.println("驱动加载成功");
-        } catch (ClassNotFoundException e) {
-            System.out.println("驱动加载失败!");
-            throw new RuntimeException(e);
-        }
-    }
-
-    public Connection getConn() {
-        try {
-            conn = DriverManager.getConnection(url,user,password);
-            System.out.println("数据库连接成功");
-        } catch (SQLException e) {
-            System.out.println("数据库连接失败！");
-            throw new RuntimeException(e);
-        }
-        return conn;
-    }
-
-    public void setConn(Connection conn) {
-        this.conn = conn;
-    }
-}
-
-```
-
-```java
-package com.student;
-
-public class Student {
-    private int id;
-    private String name;
-    private String sex;
-
-    public Student() {
-    }
-
-    public Student(int id, String name, String sex) {
-        this.id = id;
-        this.name = name;
-        this.sex = sex;
-    }
-
-    public void setId(int id) {
-        this.id = id;
-    }
-
-
-    public void setName(String name) {
-        this.name = name;
-    }
-
-    public void setSex(String sex) {
-        this.sex = sex;
-    }
-
-    @Override
-    public String toString() {
-        return "id= "+ id +" name= "+name+" sex= "+sex;
-    }
-}
-
-```
-
-```java
-package com.servlet;
-
-import com.dao.Dao;
-import com.student.Student;
-
-import javax.servlet.*;
-import javax.servlet.http.*;
-import javax.servlet.annotation.*;
-import java.io.IOException;
-import java.sql.PreparedStatement;
-import java.sql.ResultSet;
-import java.sql.SQLException;
-
-@WebServlet(name = "Servlet", value = "/Servlet")
-public class Servlet extends HttpServlet {
-    @Override
-    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
-        response.setContentType("text/html;charset=utf-8");
-        request.setCharacterEncoding("utf-8");
-        System.out.println("你调用了get方法");
-        String mess = request.getParameter("submit");
-        if (mess.endsWith("查询")) {
-            Find(request, response);
-        }
-        if (mess.endsWith("添加")) {
-            Add(request, response);
-        }
-        if (mess.endsWith("删除")) {
-            Delete(request, response);
-        }
-        if(mess.endsWith("修改")){
-            Update(request,response);
-        }
-    }
-
-    //查询
-    public void Find(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
-        String id = request.getParameter("id");
-        String name = request.getParameter("name");
-        String sex = request.getParameter("sex");
-        Student st = new Student();
-        Dao dao = new Dao();
-        String sql = "select * from student where id=? and name=? and sex=?";
-        try {
-            PreparedStatement pre = dao.getConn().prepareStatement(sql);
-            pre.setString(1, id);
-            pre.setString(2, name);
-            pre.setString(3, sex);
-            ResultSet res = pre.executeQuery();
-            while (res.next()) {
-                id = res.getString("id");
-                name = res.getString("name");
-                sex = res.getString("sex");
-                st.setId(Integer.parseInt(id));
-                st.setName(name);
-                st.setSex(sex);
-                response.getWriter().write(String.valueOf(st));
-            }
-            res.close();
-        } catch (SQLException e) {
-        }
-    }
-
-    //添加
-    public void Add(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
-        String id = request.getParameter("id");
-        String name = request.getParameter("name");
-        String sex = request.getParameter("sex");
-        Student st = new Student();
-        Dao dao = new Dao();
-        String sql = "insert into student values(?,?,?)";
-        try {
-            PreparedStatement pre = dao.getConn().prepareStatement(sql);
-            pre.setString(1, id);
-            pre.setString(2, name);
-            pre.setString(3, sex);
-            int i = pre.executeUpdate();
-            if (i > 0) {
-                st.setId(Integer.parseInt(id));
-                st.setName(name);
-                st.setSex(sex);
-                System.out.println(st);
-                response.getWriter().write("添加成功");
-            } else response.getWriter().write("添加失败");
-            pre.close();
-        } catch (SQLException e) {
-        }
-    }
-//删除
-    public void Delete(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
-        String id = request.getParameter("id");
-        Student st = new Student();
-        Dao dao = new Dao();
-        String sql = "delete from student where id=?";
-        try {
-            PreparedStatement pre = dao.getConn().prepareStatement(sql);
-            pre.setString(1, id);
-            int i = pre.executeUpdate();
-            if (i > 0) {
-                st.setId(Integer.parseInt(id));
-                response.getWriter().write("删除成功");
-            } else response.getWriter().write("删除失败");
-            pre.close();
-        } catch (SQLException e) {
-        }
-    }
-    //修改
-public void Update(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
-    String id = request.getParameter("id");
-    String name = request.getParameter("name");
-    Student st = new Student();
-    Dao dao = new Dao();
-    String sql = "update student set name=?  where id=?";
-    try {
-        PreparedStatement pre = dao.getConn().prepareStatement(sql);
-        pre.setString(2, id);
-        pre.setString(1,name);
-        int i = pre.executeUpdate();
-        if (i > 0) {
-            st.setId(Integer.parseInt(id));
-            st.setName(name);
-            response.getWriter().write("修改成功");
-        } else response.getWriter().write("修改失败");
-        pre.close();
-    } catch (SQLException e) {
-    }
-}
-    @Override
-    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
-        doGet(request, response);
-    }
-}
-
-```
-
diff --git "a/09 \346\241\202\346\263\275\347\205\234/2023-05-27\344\275\234\344\270\232.md" "b/09 \346\241\202\346\263\275\347\205\234/2023-05-27\344\275\234\344\270\232.md"
deleted file mode 100644
index aa307a9..0000000
--- "a/09 \346\241\202\346\263\275\347\205\234/2023-05-27\344\275\234\344\270\232.md"	
+++ /dev/null
@@ -1,360 +0,0 @@
-```jsp
-
-<%@ page import="com.student.Student" %>
-<%@ page import="com.dao.Dao" %>
-<%@ page import="java.sql.PreparedStatement" %>
-<%@ page import="java.sql.ResultSet" %>
-<%@ page import="java.sql.SQLException" %><%--
-  Created by IntelliJ IDEA.
-  User: MAC
-  Date: 2023/5/27
-  Time: 18:18
-  To change this template use File | Settings | File Templates.
---%>
-<%@ page contentType="text/html;charset=UTF-8" language="java" %>
-<html>
-<head>
-  <title>主页</title>
-</head>
-<style>
-  table{
-    border-collapse: collapse;
-    text-align: center;
-    width: 300px;}
-</style>
-<body>
-<table border="1">
-  <tr><th>编号</th><th>姓名</th><th>性别</th><th>操作</th></tr>
-  <%
-    Student st = new Student();
-    Dao dao = new Dao();
-    String sql = "select * from student;";
-    try {
-      PreparedStatement pre = dao.getConn().prepareStatement(sql);
-      ResultSet res = pre.executeQuery();
-      while (res.next()) {
-        String id = res.getString("id");
-        String name = res.getString("name");
-        String sex = res.getString("sex");
-        st.setId(Integer.parseInt(id));
-        st.setName(name);
-        st.setSex(sex);
-  %>
-  <tr>
-  <td><%=st.getId()%></td><td><%=st.getName()%></td><td><%=st.getSex()%></td>
-  <td><a href="update.jsp?id=<%=id%>">修改</a>&nbsp<a href="delete.jsp?id=<%=id%>">删除</a></td>
-</tr>
-  <%}res.close();} catch (SQLException e) {}%>
-</table>
-</body>
-</html>
-
-```
-
-```jsp
-<%@ page import="com.student.Student" %>
-<%@ page import="com.dao.Dao" %>
-<%@ page import="java.sql.PreparedStatement" %>
-<%@ page import="java.sql.ResultSet" %>
-<%@ page import="java.sql.SQLException" %><%--
-  Created by IntelliJ IDEA.
-  User: MAC
-  Date: 2023/5/27
-  Time: 22:48
-  To change this template use File | Settings | File Templates.
---%>
-<%@ page contentType="text/html;charset=UTF-8" language="java" %>
-<html>
-<head>
-    <title>删除学生</title>
-</head>
-<body>
-<%String id = request.getParameter("id");
-  Student st = new Student();
-  Dao dao = new Dao();
-  String sql = "delete from student where id=?";
-  try {
-    PreparedStatement pre = dao.getConn().prepareStatement(sql);
-    pre.setString(1, id);
-    int i = pre.executeUpdate();
-    if (i > 0) {
-      response.getWriter().write("<script>alert('删除成功！')</script>");
-      response.sendRedirect("index.jsp");
-      request.setAttribute("st",st);
-    } else response.getWriter().write("删除失败");
-    pre.close();
-  } catch (SQLException e) {
-  }%>
-<%  st = (Student) request.getAttribute("st");%>
-<form action="Servlet" method="post">
-  <h1>删除学生</h1>
-  <input type="hidden" name="id" value="<%=st.getId()%>"><br>
-  <input type="submit" name="submit" value="删除">
-</form>
-</body>
-</html>
-
-```
-
-```jsp
-<%@ page import="com.student.Student" %>
-<%@ page import="com.dao.Dao" %>
-<%@ page import="java.sql.PreparedStatement" %>
-<%@ page import="java.sql.SQLException" %>
-<%@ page import="java.sql.ResultSet" %><%--
-  Created by IntelliJ IDEA.
-  User: MAC
-  Date: 2023/5/27
-  Time: 19:08
-  To change this template use File | Settings | File Templates.
---%>
-<%@ page contentType="text/html;charset=UTF-8" language="java" %>
-<html>
-<head>
-    <title>修改学生信息</title>
-</head>
-<body>
-<%String id = request.getParameter("id");
-    Student st = new Student();
-    Dao dao = new Dao();
-    String sql = "select * from student where id=?;";
-    try {
-        PreparedStatement pre = dao.getConn().prepareStatement(sql);
-        pre.setString(1,id);
-        ResultSet res = pre.executeQuery();
-        res.next();
-        int id2= res.getInt("id");
-        String name = res.getString("name");
-        String sex = res.getString("sex");
-        st.setId(id2);
-        st.setName(name);
-        st.setSex(sex);
-        request.setAttribute("st",st);
-        res.close();
-    } catch (SQLException e) {
-    }%>
-<% st = (Student) request.getAttribute("st");%>
-<form action="Servlet" method="post">
-    <h1>修改学生</h1>
-    输入你要修改的学生姓名:<input type="text" name="name" value="<%=st.getName()%>"><br>
-    输入你要修改的学生性别:<input type="text" name="sex" value="<%=st.getSex()%>"><br>
-    <input type="hidden" name="id" value="<%=st.getId()%>"><br>
-    <input type="submit" name="submit" value="修改">
-</form>
-</body>
-</html>
-
-```
-
-```java
-package com.servlet;
-
-import com.dao.Dao;
-import com.student.Student;
-
-import javax.servlet.ServletException;
-import javax.servlet.annotation.WebServlet;
-import javax.servlet.http.HttpServlet;
-import javax.servlet.http.HttpServletRequest;
-import javax.servlet.http.HttpServletResponse;
-import java.io.IOException;
-import java.sql.PreparedStatement;
-import java.sql.ResultSet;
-import java.sql.SQLException;
-
-@WebServlet(name = "Servlet", value = "/Servlet")
-public class Servlet extends HttpServlet {
-    @Override
-    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
-        response.setContentType("text/html;charset=utf-8");
-        request.setCharacterEncoding("utf-8");
-        System.out.println("你调用了get方法");
-        String mess = request.getParameter("submit");
-        if (mess.endsWith("查询")) {
-            Find(request, response);
-        }
-        if (mess.endsWith("添加")) {
-            Add(request, response);
-        }
-        if(mess.endsWith("修改")){
-            Update(request,response);
-        }
-    }
-
-    //查询
-    public void Find(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
-        String id = request.getParameter("id");
-        String name = request.getParameter("name");
-        String sex = request.getParameter("sex");
-        Student st = new Student();
-        Dao dao = new Dao();
-        String sql = "select * from student where id=? and name=? and sex=?";
-        try {
-            PreparedStatement pre = dao.getConn().prepareStatement(sql);
-            pre.setString(1, id);
-            pre.setString(2, name);
-            pre.setString(3, sex);
-            ResultSet res = pre.executeQuery();
-            while (res.next()) {
-                id = res.getString("id");
-                name = res.getString("name");
-                sex = res.getString("sex");
-                st.setId(Integer.parseInt(id));
-                st.setName(name);
-                st.setSex(sex);
-                response.getWriter().write(String.valueOf(st));
-            }
-            res.close();
-        } catch (SQLException e) {
-        }
-    }
-
-    //添加
-    public void Add(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
-        String id = request.getParameter("id");
-        String name = request.getParameter("name");
-        String sex = request.getParameter("sex");
-        Student st = new Student();
-        Dao dao = new Dao();
-        String sql = "insert into student values(?,?,?)";
-        try {
-            PreparedStatement pre = dao.getConn().prepareStatement(sql);
-            pre.setString(1, id);
-            pre.setString(2, name);
-            pre.setString(3, sex);
-            int i = pre.executeUpdate();
-            if (i > 0) {
-                st.setId(Integer.parseInt(id));
-                st.setName(name);
-                st.setSex(sex);
-                System.out.println(st);
-                response.getWriter().write("添加成功");
-            } else response.getWriter().write("添加失败");
-            pre.close();
-        } catch (SQLException e) {
-        }
-    }
-    //修改
-public void Update(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
-    String id = request.getParameter("id");
-    String name = request.getParameter("name");
-    String sex = request.getParameter("sex");
-    Student st = new Student();
-    Dao dao = new Dao();
-    String sql = "update student set name=?,sex=?  where id=?";
-    try {
-        PreparedStatement pre = dao.getConn().prepareStatement(sql);
-        pre.setString(1, name);
-        pre.setString(2,sex);
-        pre.setString(3,id);
-        int i = pre.executeUpdate();
-        if (i > 0) {
-            st.setId(Integer.parseInt(id));
-            st.setName(name);
-            st.setSex(sex);
-            response.getWriter().write("修改成功");
-        } else response.getWriter().write("修改失败");
-        pre.close();
-    } catch (SQLException e) {
-    }
-}
-    @Override
-    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
-        doGet(request, response);
-    }
-}
-
-```
-
-```java
-package com.student;
-
-public class Student {
-    private int id;
-    private String name;
-    private String sex;
-
-    public Student() {
-    }
-
-    public Student(int id, String name, String sex) {
-        this.id = id;
-        this.name = name;
-        this.sex = sex;
-    }
-
-    public void setId(int id) {
-        this.id = id;
-    }
-
-
-    public void setName(String name) {
-        this.name = name;
-    }
-
-    public void setSex(String sex) {
-        this.sex = sex;
-    }
-
-    public int getId() {
-        return id;
-    }
-
-    public String getName() {
-        return name;
-    }
-
-    public String getSex() {
-        return sex;
-    }
-
-    @Override
-    public String toString() {
-        return "id= "+ id +" name= "+name+" sex= "+sex;
-    }
-}
-
-```
-
-```java
-package com.dao;
-
-import java.sql.Connection;
-import java.sql.DriverManager;
-import java.sql.SQLException;
-
-public class Dao {
- private Connection conn;
- private String driver = "com.mysql.jdbc.Driver";
- private String url ="jdbc:mysql://localhost:3306/student_db?useSSL=false&useUnicode=true&charsetEnding=utf8";
- private String user="root";
- private String password="root";
-
-    public Dao() {
-        try {
-            Class.forName(driver);
-            System.out.println("驱动加载成功");
-        } catch (ClassNotFoundException e) {
-            System.out.println("驱动加载失败!");
-            throw new RuntimeException(e);
-        }
-    }
-
-    public Connection getConn() {
-        try {
-            conn = DriverManager.getConnection(url,user,password);
-            System.out.println("数据库连接成功");
-        } catch (SQLException e) {
-            System.out.println("数据库连接失败！");
-            throw new RuntimeException(e);
-        }
-        return conn;
-    }
-
-    public void setConn(Connection conn) {
-        this.conn = conn;
-    }
-}
-
-```
-
diff --git "a/09 \346\241\202\346\263\275\347\205\234/2023-05-29\344\275\234\344\270\232.md" "b/09 \346\241\202\346\263\275\347\205\234/2023-05-29\344\275\234\344\270\232.md"
deleted file mode 100644
index 29f2409..0000000
--- "a/09 \346\241\202\346\263\275\347\205\234/2023-05-29\344\275\234\344\270\232.md"	
+++ /dev/null
@@ -1,378 +0,0 @@
-```mysql
-create database band_db charset=utf8;
-use band_db;
-create table band(
- id int  primary key auto_increment,
-name varchar(30),
-enterprisename varchar(30),
-introduction varchar(50),
-state int default 1 comment'状态:0禁用1启用'
-)comment'品牌';
-insert into band 
-values 
-(1,'三只松鼠','三只松鼠','三只松鼠,好吃不上火',1),
-(2,'优衣库','优衣库','优衣库,服适人生',0),
-(3,'小米','小米科技有限公司','为发烧而生',1);
-```
-
-```java
-package com.dao;
-
-import java.sql.Connection;
-import java.sql.DriverManager;
-import java.sql.SQLException;
-
-public class Dao {
- private Connection conn;
- private String driver = "com.mysql.jdbc.Driver";
- private String url ="jdbc:mysql://localhost:3306/band_db?useSSL=false&useUnicode=true&charsetEnding=utf8";
- private String user="root";
- private String password="root";
-
-    public Dao() {
-        try {
-            Class.forName(driver);
-            System.out.println("驱动加载成功");
-        } catch (ClassNotFoundException e) {
-            System.out.println("驱动加载失败!");
-            throw new RuntimeException(e);
-        }
-    }
-
-    public Connection getConn() {
-        try {
-            conn = DriverManager.getConnection(url,user,password);
-            System.out.println("数据库连接成功");
-        } catch (SQLException e) {
-            System.out.println("数据库连接失败！");
-            throw new RuntimeException(e);
-        }
-        return conn;
-    }
-
-    public void setConn(Connection conn) {
-        this.conn = conn;
-    }
-}
-
-```
-
-```java
-package com.band;
-
-public class Band {
-    //序号
-    private int id;
-    //品牌名称
-    private String name;
-    //企业名称
-    private String enterprisename;
-    //品牌介绍
-    private String interoduction;
-   //状态
-    private String state;
-    public Band() {
-    }
-
-    public Band(int id, String name, String enterprisename, String interoduction, String state) {
-        this.id = id;
-        this.name = name;
-        this.enterprisename = enterprisename;
-        this.interoduction = interoduction;
-        this.state = state;
-    }
-
-    public int getId() {
-        return id;
-    }
-
-    public void setId(int id) {
-        this.id = id;
-    }
-
-    public String getName() {
-        return name;
-    }
-
-    public void setName(String name) {
-        this.name = name;
-    }
-
-    public String getEnterprisename() {
-        return enterprisename;
-    }
-
-    public void setEnterprisename(String enterprisename) {
-        this.enterprisename = enterprisename;
-    }
-
-    public String getInteroduction() {
-        return interoduction;
-    }
-
-    public void setInteroduction(String interoduction) {
-        this.interoduction = interoduction;
-    }
-
-    public String getState() {
-        return state;
-    }
-
-    public void setState(String state) {
-        this.state = state;
-    }
-}
-```
-
-```java
-package com.servlet;
-
-import com.band.Band;
-import com.dao.Dao;
-
-
-import javax.servlet.ServletException;
-import javax.servlet.annotation.WebServlet;
-import javax.servlet.http.HttpServlet;
-import javax.servlet.http.HttpServletRequest;
-import javax.servlet.http.HttpServletResponse;
-import java.io.IOException;
-import java.sql.PreparedStatement;
-import java.sql.ResultSet;
-import java.sql.SQLException;
-
-@WebServlet(name = "Servlet", value = "/Servlet")
-public class Servlet extends HttpServlet {
-    @Override
-    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
-        response.setContentType("text/html;charset=utf-8");
-        request.setCharacterEncoding("utf-8");
-        System.out.println("你调用了get方法");
-        String mess = request.getParameter("submit");
-        if (mess.endsWith("查询")) {
-            Find(request, response);
-        }
-        if (mess.endsWith("添加")) {
-            Add(request, response);
-        }
-        if(mess.endsWith("修改")){
-            Update(request,response);
-        }
-    }
-
-    //查询
-    public void Find(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
-        String id = request.getParameter("id");
-        String name = request.getParameter("name");
-        String enterprisename = request.getParameter("enterprisename");
-        String introduction = request.getParameter("introduction");
-        String state = request.getParameter("state");
-        Band band = new Band();
-        Dao dao = new Dao();
-        String sql = "select * from band where id=? and name=? and enterprisename=? and introduction=? and state=?";
-        try {
-            PreparedStatement pre = dao.getConn().prepareStatement(sql);
-            pre.setString(1, id);
-            pre.setString(2, name);
-            pre.setString(3, enterprisename);
-            pre.setString(4,introduction);
-            pre.setString(5,state);
-            ResultSet res = pre.executeQuery();
-            while (res.next()) {
-                id = res.getString("id");
-                name = res.getString("name");
-                enterprisename = res.getString("enterprisename");
-                introduction = res.getString("introduction");
-                state = res.getString("state");
-                band.setId(Integer.parseInt(id));
-                band.setName(name);
-                band.setEnterprisename(enterprisename);
-                band.setInteroduction(introduction);
-                band.setState("state");
-                response.getWriter().write(String.valueOf(band));
-            }
-            res.close();
-        } catch (SQLException e) {
-        }
-    }
-
-    //添加
-    public void Add(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
-        String id = request.getParameter("id");
-        String name = request.getParameter("name");
-        String enterprisename = request.getParameter("enterprisename");
-        String introduction = request.getParameter("introduction");
-        String state = request.getParameter("state");
-        Band band = new Band();
-        Dao dao = new Dao();
-        String sql = "insert into band values(?,?,?,?,?)";
-        try {
-            PreparedStatement pre = dao.getConn().prepareStatement(sql);
-            pre.setString(1, id);
-            pre.setString(2, name);
-            pre.setString(3, enterprisename);
-            pre.setString(4,introduction);
-            pre.setString(5,state);
-            int i = pre.executeUpdate();
-            if (i > 0) {
-                band.setId(Integer.parseInt(id));
-                band.setName(name);
-                band.setEnterprisename(enterprisename);
-                band.setInteroduction(introduction);
-                band.setState(state);
-                System.out.println(band);
-                response.getWriter().write("添加成功");
-            } else response.getWriter().write("添加失败");
-            pre.close();
-        } catch (SQLException e) {
-        }
-    }
-    //修改
-public void Update(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
-    String id = request.getParameter("id");
-    String name = request.getParameter("name");
-    String enterprisename = request.getParameter("enterprisename");
-    String introduction = request.getParameter("introduction");
-    String state = request.getParameter("state");
-    Band band = new Band();
-    Dao dao = new Dao();
-    String sql = "update band set name=?,enterprisename=?,introduction=?,state=?  where id=?";
-    try {
-        PreparedStatement pre = dao.getConn().prepareStatement(sql);
-        pre.setString(1, name);
-        pre.setString(2,enterprisename);
-        pre.setString(3,introduction);
-        pre.setString(4,state);
-        pre.setString(5,id);
-        int i = pre.executeUpdate();
-        if (i > 0) {
-            band.setId(Integer.parseInt(id));
-            band.setName(name);
-            band.setEnterprisename(enterprisename);
-            band.setInteroduction(introduction);
-            band.setState(state);
-            response.getWriter().write("修改成功");
-        } else response.getWriter().write("修改失败");
-        pre.close();
-    } catch (SQLException e) {
-    }
-}
-    @Override
-    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
-        doGet(request, response);
-    }
-}
-
-```
-
-```java
-<%@ page import="com.dao.Dao" %>
-<%@ page import="java.sql.PreparedStatement" %>
-<%@ page import="java.sql.ResultSet" %>
-<%@ page import="java.sql.SQLException" %>
-<%@ page import="com.band.Band" %>
-<%@ page import="javax.xml.crypto.dsig.spec.XSLTTransformParameterSpec" %><%--
-  Created by IntelliJ IDEA.
-  User: MAC
-  Date: 2023/5/27
-  Time: 18:18
-  To change this template use File | Settings | File Templates.
---%>
-<%@ page contentType="text/html;charset=UTF-8" language="java" %>
-<html>
-<head>
-  <title>主页</title>
-</head>
-<style>
-  table,tr,th{
-    border-collapse: collapse;
-    text-align: center;
-    width: 300px;
-  border: 1px dashed}
-</style>
-<body>
-<table>
-  <tr><th>序号</th><th>品牌名称</th><th></th><th>企业名称</th><th>品牌名称</th><th>状态</th><th>操作</th></tr>
-  <%
-    Band band = new Band();
-    Dao dao = new Dao();
-    String sql = "select * from band;";
-    try {
-      PreparedStatement pre = dao.getConn().prepareStatement(sql);
-      ResultSet res = pre.executeQuery();
-      while (true) {
-        try {
-          if (!res.next()) break;
-        } catch (SQLException e) {
-          throw new RuntimeException(e);
-        }
-      }
-      String id = res.getString("id");
-       String  name = res.getString("name");
-       String enterprisename = res.getString("enterprisename");
-        String introduction = res.getString("introduction");
-      String  state = res.getString("state");
-        band.setId(Integer.parseInt(id));
-        band.setName(name);
-        band.setEnterprisename(enterprisename);
-        band.setInteroduction(introduction);
-        band.setState("state");
-  %>
-  <tr>
-  <td><%=band.getId()%></td><td><%=band.getName()%></td><td><%=band.getEnterprisename()%></td>
-    <td><%=band.getInteroduction()%></td><td><%=band.getState()%></td>
-  <td><a href="update.jsp?id=<%=id%>">修改</a>&nbsp<a href="delete.jsp?id=<%=id%>">删除</a></td>
-</tr>
-  <%res.close();} catch (SQLException e) {}%>
-</table>
-</body>
-</html>
-
-```
-
-```java
-<%@ page import="com.student.Student" %>
-<%@ page import="com.dao.Dao" %>
-<%@ page import="java.sql.PreparedStatement" %>
-<%@ page import="java.sql.ResultSet" %>
-<%@ page import="java.sql.SQLException" %>
-<%@ page import="com.band.Band" %><%--
-  Created by IntelliJ IDEA.
-  User: MAC
-  Date: 2023/5/27
-  Time: 22:48
-  To change this template use File | Settings | File Templates.
---%>
-<%@ page contentType="text/html;charset=UTF-8" language="java" %>
-<html>
-<head>
-    <title>删除学生</title>
-</head>
-<body>
-<%String id = request.getParameter("id");
-  Band band = new Band();
-  Dao dao = new Dao();
-  String sql = "delete from band where id=?";
-  try {
-    PreparedStatement pre = dao.getConn().prepareStatement(sql);
-    pre.setString(1, id);
-    int i = pre.executeUpdate();
-    if (i > 0) {
-      response.getWriter().write("<script>alert('删除成功！')</script>");
-      response.sendRedirect("index.jsp");
-      request.setAttribute("band",band);
-    } else response.getWriter().write("删除失败");
-    pre.close();
-  } catch (SQLException e) {
-  }%>
-<%  band = (Band) request.getAttribute("band");%>
-<form action="Servlet" method="post">
-  <h1>删除学生</h1>
-  <input type="hidden" name="id" value="<%=band.getId()%>"><br>
-  <input type="submit" name="submit" value="删除">
-</form>
-</body>
-</html>
-
-```
-
-- 
Gitee


From f54f07a6c524cf598abcbea92341fbf2c52f5a3f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E6=A1=82=E6=B3=BD=E7=85=9C?=
 <11435691+islover@user.noreply.gitee.com>
Date: Tue, 30 May 2023 14:25:36 +0000
Subject: [PATCH 3/3] study
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Signed-off-by: 桂泽煜 <11435691+islover@user.noreply.gitee.com>
---
 ...BC\344\275\234\344\270\232\357\274\232.md" | 231 +++++++++++
 ...41\347\220\206\347\263\273\347\273\237.md" | 177 ++++++++
 ...3-05-22tomcat \344\275\234\344\270\232.md" | 213 ++++++++++
 .../2023-05-24\344\275\234\344\270\232.md"    | 251 ++++++++++++
 .../2023-05-27\344\275\234\344\270\232.md"    | 360 +++++++++++++++++
 .../2023-05-29\344\275\234\344\270\232.md"    | 377 ++++++++++++++++++
 6 files changed, 1609 insertions(+)
 create mode 100644 "09 \346\241\202\346\263\275\347\205\234/2023-05-17JDBC\344\275\234\344\270\232\357\274\232.md"
 create mode 100644 "09 \346\241\202\346\263\275\347\205\234/2023-05-20\345\255\246\347\224\237\347\256\241\347\220\206\347\263\273\347\273\237.md"
 create mode 100644 "09 \346\241\202\346\263\275\347\205\234/2023-05-22tomcat \344\275\234\344\270\232.md"
 create mode 100644 "09 \346\241\202\346\263\275\347\205\234/2023-05-24\344\275\234\344\270\232.md"
 create mode 100644 "09 \346\241\202\346\263\275\347\205\234/2023-05-27\344\275\234\344\270\232.md"
 create mode 100644 "09 \346\241\202\346\263\275\347\205\234/2023-05-29\344\275\234\344\270\232.md"

diff --git "a/09 \346\241\202\346\263\275\347\205\234/2023-05-17JDBC\344\275\234\344\270\232\357\274\232.md" "b/09 \346\241\202\346\263\275\347\205\234/2023-05-17JDBC\344\275\234\344\270\232\357\274\232.md"
new file mode 100644
index 0000000..6ff81ce
--- /dev/null
+++ "b/09 \346\241\202\346\263\275\347\205\234/2023-05-17JDBC\344\275\234\344\270\232\357\274\232.md"	
@@ -0,0 +1,231 @@
+### JDBC作业：
+
+1. MySQL中创建一个数据库student_db
+
+2. 库中创建student表
+
+3. 表中数据如下
+
+4. | 编号 | 姓名 | 性别 |
+   | ---- | ---- | ---- |
+   | 1    | 张三 | 男   |
+   | 2    | 李四 | 女   |
+   | 3    | 王五 | 男   |
+
+5. 编写java 4个类，分别实现以下功能
+
+   1. 查询功能，查询student中所有数据
+   2. 添加功能
+   3. 修改功能
+   4. 删除功能
+
+6. 扩展题【预习题】
+
+   1. 能否实现一个类中，用四个方法来实现上面4个类的功能
+   2. 能否实现将查询的结果，封装成java对象
+
+```java
+import com.mysql.cj.jdbc.Driver;
+
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.SQLException;
+
+public class Conn {
+    Connection con;
+    public static String user;
+    public static String password;
+    public Connection getConnection(){
+        try{
+            Class.forName("com.mysql.cj.jdbc.Driver");
+            System.out.println("数据库驱动加载成功");
+        } catch (ClassNotFoundException e) {
+            e.printStackTrace();
+        }
+        user ="root";
+        password = "root";
+        try {
+            con = DriverManager.getConnection("jdbc:mysql://localhost:3306/student_db?useUnicode=true&characterEncoding=gbk",user,password);
+            System.out.println("数据库连接成功");
+        }catch (SQLException e){
+            e.printStackTrace();
+        }
+        return con;
+    }
+
+    public static void main(String[] args) {
+        Conn c = new Conn();
+        c.getConnection();
+    }
+}
+```
+
+```java
+import java.sql.*;
+
+public class JDBC {
+    static String url = "jdbc:mysql://localhost:3306/student_db?useUnicode=true&characterEncoding=utf8&useSSL=false";
+    static String username = "root";
+    static String password = "root";
+
+    public static void main(String[] args) {
+        try {
+            Class.forName("com.mysql.cj.jdbc.Driver");
+        } catch (ClassNotFoundException e) {
+            e.printStackTrace();
+        }
+        find();
+        add();
+        update();
+        delete();
+    }
+
+    static void find() {
+        Connection connection = null;
+        try {
+            connection = DriverManager.getConnection(url, username, password);
+        } catch (SQLException throwables) {
+            throwables.printStackTrace();
+        }
+        Statement statement = null;
+        try {
+            statement = connection.createStatement();
+        } catch (SQLException throwables) {
+            throwables.printStackTrace();
+        }
+        String sql = "SELECT * FROM STUDENT;";
+        ResultSet resultSet = null;
+        try {
+            resultSet = statement.executeQuery(sql);
+        } catch (SQLException throwables) {
+            throwables.printStackTrace();
+        }
+        while (true) {
+            try {
+                if (!resultSet.next()) break;
+            } catch (SQLException throwables) {
+                throwables.printStackTrace();
+            }
+            try {
+                System.out.println("id=" + resultSet.getInt("id"));
+            } catch (SQLException throwables) {
+                throwables.printStackTrace();
+            }
+            try {
+                System.out.println("name=" + resultSet.getString("name"));
+            } catch (SQLException throwables) {
+                throwables.printStackTrace();
+            }
+            try {
+                System.out.println("sex=" + resultSet.getString("sex"));
+            } catch (SQLException throwables) {
+                throwables.printStackTrace();
+            }
+        }
+        try {
+            resultSet.close();
+            connection.close();
+        } catch (SQLException throwables) {
+            throwables.printStackTrace();
+        }
+    }
+
+    static void add() {
+        Connection connection = null;
+        try {
+            connection = DriverManager.getConnection(url, username, password);
+        } catch (SQLException throwables) {
+            throwables.printStackTrace();
+        }
+        Statement statement = null;
+        try {
+            statement = connection.createStatement();
+        } catch (SQLException throwables) {
+            throwables.printStackTrace();
+        }
+        String sql2 = "INSERT INTO STUDENT VALUES (4,'柳长风','男');";
+        int i = 0;
+        try {
+            i = statement.executeUpdate(sql2);
+        } catch (SQLException throwables) {
+        }
+        System.out.println("添加了" + i + "条数据");
+        try {
+            statement.close();
+        } catch (SQLException throwables) {
+            throwables.printStackTrace();
+        }
+    }
+
+    static void update() {
+        Connection connection = null;
+        try {
+            connection = DriverManager.getConnection(url, username, password);
+        } catch (SQLException throwables) {
+            throwables.printStackTrace();
+        }
+        Statement statement = null;
+        try {
+            statement = connection.createStatement();
+        } catch (SQLException throwables) {
+            throwables.printStackTrace();
+        }
+        String sql3 = "UPDATE STUDENT SET NAME='张翰' WHERE ID =1;";
+        int s = 0;
+        try {
+            s = statement.executeUpdate(sql3);
+        } catch (SQLException throwables) {
+        }
+        System.out.println("更新了" + s + "条数据");
+        try {
+            statement.close();
+        } catch (SQLException throwables) {
+            throwables.printStackTrace();
+        }
+    }
+
+    static void delete() {
+        Connection connection = null;
+        try {
+            connection = DriverManager.getConnection(url, username, password);
+        } catch (SQLException throwables) {
+            throwables.printStackTrace();
+        }
+        Statement statement = null;
+        try {
+            statement = connection.createStatement();
+        } catch (SQLException throwables) {
+            throwables.printStackTrace();
+        }
+        String sql4 = "DELETE  FROM STUDENT WHERE ID =4";
+        int j = 0;
+        try {
+            j = statement.executeUpdate(sql4);
+        } catch (SQLException throwables) {
+        }
+        System.out.println("删除了" + j + "条数据");
+        try {
+            statement.close();
+        } catch (SQLException throwables) {
+            throwables.printStackTrace();
+        }
+    }
+}
+```
+
+```mysql
+create database student_db charset=utf8;
+use student_db;
+create table student(
+id int primary key auto_increment comment'编号',
+name varchar(20) comment'姓名',
+sex char(1) comment'性别'
+)comment'学生表';
+insert into student 
+values 
+(1,'张三','男'),
+(2,'李四','女'),
+(3,'王五','男');
+
+```
+
diff --git "a/09 \346\241\202\346\263\275\347\205\234/2023-05-20\345\255\246\347\224\237\347\256\241\347\220\206\347\263\273\347\273\237.md" "b/09 \346\241\202\346\263\275\347\205\234/2023-05-20\345\255\246\347\224\237\347\256\241\347\220\206\347\263\273\347\273\237.md"
new file mode 100644
index 0000000..aa480ea
--- /dev/null
+++ "b/09 \346\241\202\346\263\275\347\205\234/2023-05-20\345\255\246\347\224\237\347\256\241\347\220\206\347\263\273\347\273\237.md"	
@@ -0,0 +1,177 @@
+```mysql
+create database student_db charset=utf8;
+use student_db;
+create table student(
+id int primary key auto_increment comment'编号',
+name varchar(20) comment'姓名',
+sex char(1) comment'性别'
+)comment'学生表';
+insert into student 
+values 
+(1,'张三','男'),
+(2,'李四','女'),
+(3,'王五','男');
+```
+
+```java
+import java.sql.*;
+import java.util.Scanner;
+
+public class studentmanagementsystem {
+    static Scanner scanner = new Scanner(System.in);
+
+    {
+        try {
+            Class.forName("com.mysql.cj.jdbc.Driver");
+        } catch (ClassNotFoundException e) {
+            throw new RuntimeException(e);
+        }
+        Connection connection = null;
+        try {
+            connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/student_db?useSSl=false&useUnicode=true&characterEncoding=utf8", "root", "root");
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    public static void main(String[] args) {
+        studentmanagementsystem studentmanagementsystem = new studentmanagementsystem();
+        while (true) {
+            System.out.println("---学生管理系统---" +
+                    "\n---1.查询所有数据" +
+                    "\n---2.添加数据" +
+                    "\n---3.删除数据" +
+                    "\n---4.更新数据" +
+                    "\n---5.退出" +
+                    "\n请输入对应的数字");
+            int i = scanner.nextInt();
+            switch (i) {
+                case 1:
+                    find();
+                    break;
+                case 2:
+                    add();
+                    break;
+                case 3:
+                    delete();
+                    break;
+                case 4:
+                    update();
+                    break;
+                case 5:
+                    System.exit(0);
+            }
+        }
+
+    }
+
+    static void find() {
+        Connection connection = null;
+        String sql = "SELECT * FROM STUDENT;";
+        Statement statement = null;
+        ResultSet resultSet = null;
+        try {
+            connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/student_db?useSSl=false&useUnicode=true&characterEncoding=utf8", "root", "root");
+            statement = connection.prepareStatement(sql);
+            resultSet = statement.executeQuery(sql);
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+        while (true) {
+            try {
+                if (!resultSet.next()) break;
+                System.out.println("编号:" + resultSet.getString("id"));
+                System.out.println("姓名:" + resultSet.getString("name"));
+                System.out.println("性别:" + resultSet.getString("sex"));
+            } catch (SQLException e) {
+                throw new RuntimeException(e);
+            }
+        }
+        try {
+            resultSet.close();
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    static void add() {
+        Connection connection = null;
+        System.out.println("请输入编号:");
+        String number = scanner.next();
+        System.out.println("请输入姓名:");
+        String name = scanner.next();
+        System.out.println("请输入性别:");
+        String sex = scanner.next();
+        String sql = "INSERT INTO student VALUES (?,?,?);";
+        int i = 0;
+        PreparedStatement statement=null;
+        try {
+            connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/student_db?useSSl=false&useUnicode=true&characterEncoding=utf8", "root", "root");
+            statement = connection.prepareStatement(sql);
+            statement.setString(1,number);
+            statement.setString(2,name);
+            statement.setString(3,sex);
+            i = statement.executeUpdate();
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+        System.out.println("添加了" + i + "条数据");
+        try {
+            statement.close();
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    static void delete() {
+        Connection connection = null;
+        System.out.println("请输入你要删除的编号:");
+        String number = scanner.next();
+        String sql = "DELETE FROM STUDENT  WHERE id=?;";
+        PreparedStatement statement = null;
+        int i = 0;
+        try {
+            connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/student_db?useSSl=false&useUnicode=true&characterEncoding=utf8", "root", "root");
+            statement = connection.prepareStatement(sql);
+            statement.setString(1,number);
+            i = statement.executeUpdate();
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+        System.out.println("删除了" + i + "条数据");
+        try {
+            statement.close();
+        } catch (SQLException throwables) {
+            throwables.printStackTrace();
+        }
+    }
+
+    static void update() {
+        Connection connection = null;
+        System.out.println("请输入修改的姓名:");
+        String name = scanner.next();
+        System.out.println("请输入它的编号");
+        String number = scanner.next();
+        String sql = "UPDATE student set name=? where id = ?;";
+        PreparedStatement statement = null;
+        int i = 0;
+        try {
+            connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/student_db?useSSl=false&useUnicode=true&characterEncoding=utf8", "root", "root");
+            statement = connection.prepareStatement(sql);
+            statement.setString(1,name);
+            statement.setString(2,number);
+            i = statement.executeUpdate();
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+        System.out.println("更新了" + i + "条数据");
+        try {
+            statement.close();
+        } catch (SQLException throwables) {
+            throwables.printStackTrace();
+        }
+    }
+}
+
+```
+
diff --git "a/09 \346\241\202\346\263\275\347\205\234/2023-05-22tomcat \344\275\234\344\270\232.md" "b/09 \346\241\202\346\263\275\347\205\234/2023-05-22tomcat \344\275\234\344\270\232.md"
new file mode 100644
index 0000000..ab8ffd9
--- /dev/null
+++ "b/09 \346\241\202\346\263\275\347\205\234/2023-05-22tomcat \344\275\234\344\270\232.md"	
@@ -0,0 +1,213 @@
+```markdown
+# 作业，
+ * 1 数据库相关的操作，使用封装的工具类
+ * 2 编写四个servlet，使用注解指定相关的访问路径，分别对应查询，修改，删除，添加的操作
+ * 3 从浏览器中，访问这中个路径，显示响应的信息，查询显示结果，其它的显示成功或是失败
+ * 4 预习题：如何通过浏览器传送请求参数给servlet，servlet如何接收这些参数，并使用这些参数，去影响数据库的操作？
+
+```
+
+```java
+package com.min.xin.Servlet;
+
+import javax.servlet.ServletException;
+import javax.servlet.annotation.WebServlet;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import javax.servlet.http.HttpSession;
+import java.io.IOException;
+import java.sql.*;
+
+@WebServlet("/Find")
+public class Find extends HttpServlet {
+    @Override
+    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+    req.setCharacterEncoding("utf-8");
+    resp.setContentType("text/html;charset=utf-8");
+        {
+            try {
+                Class.forName("com.mysql.jdbc.Driver");
+                Connection connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/student_db?useSSL=false&useUnicode=true&charsetEnding=utf8", "root", "root");
+                int id = Integer.parseInt(req.getParameter("id"));
+                String name = req.getParameter("name");
+                String sex = req.getParameter("sex");
+                String sql = "select * from student where id=? and name=? and sex=?;";
+                PreparedStatement preparedStatement = connection.prepareStatement(sql);
+                ResultSet resultSet = preparedStatement.executeQuery(sql);
+                resp.getWriter().write("编号&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp姓名&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp性别" + "<br />");
+                while (resultSet.next()) {
+                     id = resultSet.getInt("id");
+                     name = resultSet.getString("name");
+                     sex = resultSet.getString("sex");
+                    resp.getWriter().write(id + "&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp" + name + "&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp" + sex + "<br />");
+                }
+                resultSet.close();
+            } catch (ClassNotFoundException | SQLException e) {
+                e.printStackTrace();
+            }
+        }
+    }
+
+    @Override
+    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+doGet(req,resp);
+    }
+}
+
+```
+
+```java
+package com.min.xin.Servlet;
+
+import javax.servlet.ServletException;
+import javax.servlet.annotation.WebServlet;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import javax.servlet.http.HttpSession;
+import java.io.IOException;
+import java.sql.*;
+
+@WebServlet("/Update")
+public class Update extends HttpServlet {
+    @Override
+    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        {
+            try {
+                Class.forName("com.mysql.jdbc.Driver");
+                Connection connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/student_db?useSSL=false&useUnicode=true&charsetEnding=utf8", "root","root");
+                HttpSession httpSession = req.getSession(true);
+                String name = req.getParameter("name");
+                String id = req.getParameter("id");
+                String sql ="update student set name=? where id=?;";
+                PreparedStatement preparedStatement = connection.prepareStatement(sql);
+                preparedStatement.setString(1,name);
+                preparedStatement.setString(2,id);
+                int i = preparedStatement.executeUpdate(sql);
+                if(i >0){
+                    resp.getWriter().write("更新成功");
+                }else{
+                    resp.getWriter().write("更新失败");
+                }
+            } catch (ClassNotFoundException e) {
+                e.printStackTrace();
+            } catch (SQLException throwables) {
+                throwables.printStackTrace();
+            }
+        }
+    }
+
+    @Override
+    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+doGet(req,resp);
+    }
+}
+
+```
+
+```java
+package com.min.xin.Servlet;
+
+import javax.servlet.ServletException;
+import javax.servlet.annotation.WebServlet;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import javax.servlet.http.HttpSession;
+import java.io.IOException;
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.PreparedStatement;
+import java.sql.SQLException;
+
+@WebServlet("/Delete")
+public class Delete extends HttpServlet {
+    @Override
+    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        {
+            try {
+                Class.forName("com.mysql.jdbc.Driver");
+                Connection connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/student_db?useSSL=false&useUnicode=true&charsetEnding=utf8", "root","root");
+                HttpSession httpSession = req.getSession(true);
+                String id = req.getParameter("id");
+                String sql ="DELETE FROM STUDENT ID=?";
+                PreparedStatement preparedStatement = connection.prepareStatement(sql);
+                preparedStatement.setString(1,id);
+                int i = preparedStatement.executeUpdate(sql);
+                if(i >0){
+                    resp.getWriter().write("删除成功");
+                }else{
+                    resp.getWriter().write("删除失败");
+                }
+            } catch (ClassNotFoundException e) {
+                e.printStackTrace();
+            } catch (SQLException throwables) {
+                throwables.printStackTrace();
+            }
+        }
+
+    }
+
+    @Override
+    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+doGet(req,resp);
+    }
+}
+
+```
+
+```java
+package com.min.xin.Servlet;
+
+import javax.servlet.ServletException;
+import javax.servlet.annotation.WebServlet;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import javax.servlet.http.HttpSession;
+import java.io.IOException;
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.PreparedStatement;
+import java.sql.SQLException;
+
+@WebServlet("/Add")
+public class Add extends HttpServlet {
+    @Override
+    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        {
+            try {
+                Class.forName("com.mysql.jdbc.Driver");
+                Connection connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/student_db?useSSL=false&useUnicode=true&charsetEnding=utf8", "root","root");
+                HttpSession httpSession = req.getSession(true);
+                String id = req.getParameter("id");
+                String name = req.getParameter("name");
+                String sex = req.getParameter("sex");
+                String sql ="insert into student values(?,?,?);";
+                PreparedStatement preparedStatement = connection.prepareStatement(sql);
+                preparedStatement.setString(1,id);
+                preparedStatement.setString(2,name);
+                preparedStatement.setString(3,sex);
+                int i = preparedStatement.executeUpdate(sql);
+                if(i >0){
+                    resp.getWriter().write("添加成功");
+                }else{
+                    resp.getWriter().write("添加失败");
+                }
+            } catch (ClassNotFoundException e) {
+                e.printStackTrace();
+            } catch (SQLException throwables) {
+                throwables.printStackTrace();
+            }
+        }
+    }
+
+    @Override
+    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+doGet(req,resp);
+    }
+}
+
+```
+
diff --git "a/09 \346\241\202\346\263\275\347\205\234/2023-05-24\344\275\234\344\270\232.md" "b/09 \346\241\202\346\263\275\347\205\234/2023-05-24\344\275\234\344\270\232.md"
new file mode 100644
index 0000000..6956eb0
--- /dev/null
+++ "b/09 \346\241\202\346\263\275\347\205\234/2023-05-24\344\275\234\344\270\232.md"	
@@ -0,0 +1,251 @@
+```html
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <title>学生管理系统</title>
+</head>
+<body>
+<form action="Servlet" method="post">
+    <h1>查询学生</h1>
+    输入你要查询的学生编号:<input type="text" name="id"><br>
+    输入你要查询的学生姓名:<input type="text" name="name"><br>
+    输入你要查询的学生性别:<input type="text" name="sex"><br>
+    <input type="submit" name="submit" value="查询">
+</form>
+<form action="Servlet" method="post">
+    <h1>添加学生</h1>
+    输入你要添加的学生编号:<input type="text" name="id"><br>
+    输入你要添加的学生姓名:<input type="text" name="name"><br>
+    输入你要添加的学生性别:<input type="text" name="sex"><br>
+    <input type="submit" name="submit" value="添加">
+</form>
+<form action="Servlet" method="post">
+    <h1>删除学生</h1>
+    输入你要删除的学生编号:<input type="text" name="id"><br>
+    <input type="submit" name="submit" value="删除">
+</form>
+<form action="Servlet" method="post">
+    <h1>修改学生</h1>
+    输入你要修改的学生编号:<input type="text" name="id"><br>
+    输入你要修改的学生姓名:<input type="text" name="name"><br>
+    <input type="submit" name="submit" value="修改">
+</form>
+</body>
+</html>
+```
+
+```java
+package com.dao;
+
+import java.sql.*;
+
+public class Dao {
+ private Connection conn;
+ private String driver = "com.mysql.jdbc.Driver";
+ private String url ="jdbc:mysql://localhost:3306/student_db?useSSL=false&useUnicode=true&charsetEnding=utf8";
+ private String user="root";
+ private String password="root";
+
+    public Dao() {
+        try {
+            Class.forName(driver);
+            System.out.println("驱动加载成功");
+        } catch (ClassNotFoundException e) {
+            System.out.println("驱动加载失败!");
+            throw new RuntimeException(e);
+        }
+    }
+
+    public Connection getConn() {
+        try {
+            conn = DriverManager.getConnection(url,user,password);
+            System.out.println("数据库连接成功");
+        } catch (SQLException e) {
+            System.out.println("数据库连接失败！");
+            throw new RuntimeException(e);
+        }
+        return conn;
+    }
+
+    public void setConn(Connection conn) {
+        this.conn = conn;
+    }
+}
+
+```
+
+```java
+package com.student;
+
+public class Student {
+    private int id;
+    private String name;
+    private String sex;
+
+    public Student() {
+    }
+
+    public Student(int id, String name, String sex) {
+        this.id = id;
+        this.name = name;
+        this.sex = sex;
+    }
+
+    public void setId(int id) {
+        this.id = id;
+    }
+
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public void setSex(String sex) {
+        this.sex = sex;
+    }
+
+    @Override
+    public String toString() {
+        return "id= "+ id +" name= "+name+" sex= "+sex;
+    }
+}
+
+```
+
+```java
+package com.servlet;
+
+import com.dao.Dao;
+import com.student.Student;
+
+import javax.servlet.*;
+import javax.servlet.http.*;
+import javax.servlet.annotation.*;
+import java.io.IOException;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+
+@WebServlet(name = "Servlet", value = "/Servlet")
+public class Servlet extends HttpServlet {
+    @Override
+    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+        response.setContentType("text/html;charset=utf-8");
+        request.setCharacterEncoding("utf-8");
+        System.out.println("你调用了get方法");
+        String mess = request.getParameter("submit");
+        if (mess.endsWith("查询")) {
+            Find(request, response);
+        }
+        if (mess.endsWith("添加")) {
+            Add(request, response);
+        }
+        if (mess.endsWith("删除")) {
+            Delete(request, response);
+        }
+        if(mess.endsWith("修改")){
+            Update(request,response);
+        }
+    }
+
+    //查询
+    public void Find(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+        String id = request.getParameter("id");
+        String name = request.getParameter("name");
+        String sex = request.getParameter("sex");
+        Student st = new Student();
+        Dao dao = new Dao();
+        String sql = "select * from student where id=? and name=? and sex=?";
+        try {
+            PreparedStatement pre = dao.getConn().prepareStatement(sql);
+            pre.setString(1, id);
+            pre.setString(2, name);
+            pre.setString(3, sex);
+            ResultSet res = pre.executeQuery();
+            while (res.next()) {
+                id = res.getString("id");
+                name = res.getString("name");
+                sex = res.getString("sex");
+                st.setId(Integer.parseInt(id));
+                st.setName(name);
+                st.setSex(sex);
+                response.getWriter().write(String.valueOf(st));
+            }
+            res.close();
+        } catch (SQLException e) {
+        }
+    }
+
+    //添加
+    public void Add(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+        String id = request.getParameter("id");
+        String name = request.getParameter("name");
+        String sex = request.getParameter("sex");
+        Student st = new Student();
+        Dao dao = new Dao();
+        String sql = "insert into student values(?,?,?)";
+        try {
+            PreparedStatement pre = dao.getConn().prepareStatement(sql);
+            pre.setString(1, id);
+            pre.setString(2, name);
+            pre.setString(3, sex);
+            int i = pre.executeUpdate();
+            if (i > 0) {
+                st.setId(Integer.parseInt(id));
+                st.setName(name);
+                st.setSex(sex);
+                System.out.println(st);
+                response.getWriter().write("添加成功");
+            } else response.getWriter().write("添加失败");
+            pre.close();
+        } catch (SQLException e) {
+        }
+    }
+//删除
+    public void Delete(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+        String id = request.getParameter("id");
+        Student st = new Student();
+        Dao dao = new Dao();
+        String sql = "delete from student where id=?";
+        try {
+            PreparedStatement pre = dao.getConn().prepareStatement(sql);
+            pre.setString(1, id);
+            int i = pre.executeUpdate();
+            if (i > 0) {
+                st.setId(Integer.parseInt(id));
+                response.getWriter().write("删除成功");
+            } else response.getWriter().write("删除失败");
+            pre.close();
+        } catch (SQLException e) {
+        }
+    }
+    //修改
+public void Update(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+    String id = request.getParameter("id");
+    String name = request.getParameter("name");
+    Student st = new Student();
+    Dao dao = new Dao();
+    String sql = "update student set name=?  where id=?";
+    try {
+        PreparedStatement pre = dao.getConn().prepareStatement(sql);
+        pre.setString(2, id);
+        pre.setString(1,name);
+        int i = pre.executeUpdate();
+        if (i > 0) {
+            st.setId(Integer.parseInt(id));
+            st.setName(name);
+            response.getWriter().write("修改成功");
+        } else response.getWriter().write("修改失败");
+        pre.close();
+    } catch (SQLException e) {
+    }
+}
+    @Override
+    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+        doGet(request, response);
+    }
+}
+
+```
+
diff --git "a/09 \346\241\202\346\263\275\347\205\234/2023-05-27\344\275\234\344\270\232.md" "b/09 \346\241\202\346\263\275\347\205\234/2023-05-27\344\275\234\344\270\232.md"
new file mode 100644
index 0000000..c49b490
--- /dev/null
+++ "b/09 \346\241\202\346\263\275\347\205\234/2023-05-27\344\275\234\344\270\232.md"	
@@ -0,0 +1,360 @@
+```jsp
+
+<%@ page import="com.student.Student" %>
+<%@ page import="com.dao.Dao" %>
+<%@ page import="java.sql.PreparedStatement" %>
+<%@ page import="java.sql.ResultSet" %>
+<%@ page import="java.sql.SQLException" %><%--
+  Created by IntelliJ IDEA.
+  User: MAC
+  Date: 2023/5/27
+  Time: 18:18
+  To change this template use File | Settings | File Templates.
+--%>
+<%@ page contentType="text/html;charset=UTF-8" language="java" %>
+<html>
+<head>
+  <title>主页</title>
+</head>
+<style>
+  table{
+    border-collapse: collapse;
+    text-align: center;
+    width: 300px;}
+</style>
+<body>
+<table border="1">
+  <tr><th>编号</th><th>姓名</th><th>性别</th><th>操作</th></tr>
+  <%
+    Student st = new Student();
+    Dao dao = new Dao();
+    String sql = "select * from student;";
+    try {
+      PreparedStatement pre = dao.getConn().prepareStatement(sql);
+      ResultSet res = pre.executeQuery();
+      while (res.next()) {
+        String id = res.getString("id");
+        String name = res.getString("name");
+        String sex = res.getString("sex");
+        st.setId(Integer.parseInt(id));
+        st.setName(name);
+        st.setSex(sex);
+  %>
+  <tr>
+  <td><%=st.getId()%></td><td><%=st.getName()%></td><td><%=st.getSex()%></td>
+  <td><a href="update.jsp?id=<%=id%>">修改</a>&nbsp<a href="delete.jsp?id=<%=id%>">删除</a></td>
+</tr>
+  <%}res.close();} catch (SQLException e) {}%>
+</table>
+</body>
+</html>
+
+```
+
+```jsp
+<%@ page import="com.student.Student" %>
+<%@ page import="com.dao.Dao" %>
+<%@ page import="java.sql.PreparedStatement" %>
+<%@ page import="java.sql.ResultSet" %>
+<%@ page import="java.sql.SQLException" %><%--
+  Created by IntelliJ IDEA.
+  User: MAC
+  Date: 2023/5/27
+  Time: 22:48
+  To change this template use File | Settings | File Templates.
+--%>
+<%@ page contentType="text/html;charset=UTF-8" language="java" %>
+<html>
+<head>
+    <title>删除学生</title>
+</head>
+<body>
+<%String id = request.getParameter("id");
+  Student st = new Student();
+  Dao dao = new Dao();
+  String sql = "delete from student where id=?";
+  try {
+    PreparedStatement pre = dao.getConn().prepareStatement(sql);
+    pre.setString(1, id);
+    int i = pre.executeUpdate();
+    if (i > 0) {
+      response.getWriter().write("<script>alert('删除成功！')</script>");
+      response.sendRedirect("index.jsp");
+      request.setAttribute("st",st);
+    } else response.getWriter().write("删除失败");
+    pre.close();
+  } catch (SQLException e) {
+  }%>
+<%  st = (Student) request.getAttribute("st");%>
+<form action="Servlet" method="post">
+  <h1>删除学生</h1>
+  <input type="hidden" name="id" value="<%=st.getId()%>"><br>
+  <input type="submit" name="submit" value="删除">
+</form>
+</body>
+</html>
+
+```
+
+```jsp
+<%@ page import="com.student.Student" %>
+<%@ page import="com.dao.Dao" %>
+<%@ page import="java.sql.PreparedStatement" %>
+<%@ page import="java.sql.SQLException" %>
+<%@ page import="java.sql.ResultSet" %><%--
+  Created by IntelliJ IDEA.
+  User: MAC
+  Date: 2023/5/27
+  Time: 19:08
+  To change this template use File | Settings | File Templates.
+--%>
+<%@ page contentType="text/html;charset=UTF-8" language="java" %>
+<html>
+<head>
+    <title>修改学生信息</title>
+</head>
+<body>
+<%String id = request.getParameter("id");
+    Student st = new Student();
+    Dao dao = new Dao();
+    String sql = "select * from student where id=?;";
+    try {
+        PreparedStatement pre = dao.getConn().prepareStatement(sql);
+        pre.setString(1,id);
+        ResultSet res = pre.executeQuery();
+        res.next();
+        int id2= res.getInt("id");
+        String name = res.getString("name");
+        String sex = res.getString("sex");
+        st.setId(id2);
+        st.setName(name);
+        st.setSex(sex);
+        request.setAttribute("st",st);
+        res.close();
+    } catch (SQLException e) {
+    }%>
+<% st = (Student) request.getAttribute("st");%>
+<form action="Servlet" method="post">
+    <h1>修改学生</h1>
+    输入你要修改的学生姓名:<input type="text" name="name" value="<%=st.getName()%>"><br>
+    输入你要修改的学生性别:<input type="text" name="sex" value="<%=st.getSex()%>"><br>
+    <input type="hidden" name="id" value="<%=st.getId()%>"><br>
+    <input type="submit" name="submit" value="修改">
+</form>
+</body>
+</html>
+
+```
+
+```java
+package com.servlet;
+
+import com.dao.Dao;
+import com.student.Student;
+
+import javax.servlet.ServletException;
+import javax.servlet.annotation.WebServlet;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import java.io.IOException;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+
+@WebServlet(name = "Servlet", value = "/Servlet")
+public class Servlet extends HttpServlet {
+    @Override
+    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+        response.setContentType("text/html;charset=utf-8");
+        request.setCharacterEncoding("utf-8");
+        System.out.println("你调用了get方法");
+        String mess = request.getParameter("submit");
+        if (mess.endsWith("查询")) {
+            Find(request, response);
+        }
+        if (mess.endsWith("添加")) {
+            Add(request, response);
+        }
+        if(mess.endsWith("修改")){
+            Update(request,response);
+        }
+    }
+
+    //查询
+    public void Find(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+        String id = request.getParameter("id");
+        String name = request.getParameter("name");
+        String sex = request.getParameter("sex");
+        Student st = new Student();
+        Dao dao = new Dao();
+        String sql = "select * from student where id=? and name=? and sex=?";
+        try {
+            PreparedStatement pre = dao.getConn().prepareStatement(sql);
+            pre.setString(1, id);
+            pre.setString(2, name);
+            pre.setString(3, sex);
+            ResultSet res = pre.executeQuery();
+            while (res.next()) {
+                id = res.getString("id");
+                name = res.getString("name");
+                sex = res.getString("sex");
+                st.setId(Integer.parseInt(id));
+                st.setName(name);
+                st.setSex(sex);
+                response.getWriter().write(String.valueOf(st));
+            }
+            res.close();
+        } catch (SQLException e) {
+        }
+    }
+
+    //添加
+    public void Add(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+        String id = request.getParameter("id");
+        String name = request.getParameter("name");
+        String sex = request.getParameter("sex");
+        Student st = new Student();
+        Dao dao = new Dao();
+        String sql = "insert into student values(?,?,?)";
+        try {
+            PreparedStatement pre = dao.getConn().prepareStatement(sql);
+            pre.setString(1, id);
+            pre.setString(2, name);
+            pre.setString(3, sex);
+            int i = pre.executeUpdate();
+            if (i > 0) {
+                st.setId(Integer.parseInt(id));
+                st.setName(name);
+                st.setSex(sex);
+                System.out.println(st);
+                response.getWriter().write("添加成功");
+            } else response.getWriter().write("添加失败");
+            pre.close();
+        } catch (SQLException e) {
+        }
+    }
+    //修改
+public void Update(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+    String id = request.getParameter("id");
+    String name = request.getParameter("name");
+    String sex = request.getParameter("sex");
+    Student st = new Student();
+    Dao dao = new Dao();
+    String sql = "update student set name=?,sex=?  where id=?";
+    try {
+        PreparedStatement pre = dao.getConn().prepareStatement(sql);
+        pre.setString(1, name);
+        pre.setString(2,sex);
+        pre.setString(3,id);
+        int i = pre.executeUpdate();
+        if (i > 0) {
+            st.setId(Integer.parseInt(id));
+            st.setName(name);
+            st.setSex(sex);
+            response.getWriter().write("修改成功");
+        } else response.getWriter().write("修改失败");
+        pre.close();
+    } catch (SQLException e) {
+    }
+}
+    @Override
+    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+        doGet(request, response);
+    }
+}
+
+```
+
+```java
+package com.student;
+
+public class Student {
+    private int id;
+    private String name;
+    private String sex;
+
+    public Student() {
+    }
+
+    public Student(int id, String name, String sex) {
+        this.id = id;
+        this.name = name;
+        this.sex = sex;
+    }
+
+    public void setId(int id) {
+        this.id = id;
+    }
+
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public void setSex(String sex) {
+        this.sex = sex;
+    }
+
+    public int getId() {
+        return id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public String getSex() {
+        return sex;
+    }
+
+    @Override
+    public String toString() {
+        return "id= "+ id +" name= "+name+" sex= "+sex;
+    }
+}
+
+```
+
+```java
+package com.dao;
+
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.SQLException;
+
+public class Dao {
+ private Connection conn;
+ private String driver = "com.mysql.jdbc.Driver";
+ private String url ="jdbc:mysql://localhost:3306/student_db?useSSL=false&useUnicode=true&charsetEnding=utf8";
+ private String user="root";
+ private String password="root";
+
+    public Dao() {
+        try {
+            Class.forName(driver);
+            System.out.println("驱动加载成功");
+        } catch (ClassNotFoundException e) {
+            System.out.println("驱动加载失败!");
+            throw new RuntimeException(e);
+        }
+    }
+
+    public Connection getConn() {
+        try {
+            conn = DriverManager.getConnection(url,user,password);
+            System.out.println("数据库连接成功");
+        } catch (SQLException e) {
+            System.out.println("数据库连接失败！");
+            throw new RuntimeException(e);
+        }
+        return conn;
+    }
+
+    public void setConn(Connection conn) {
+        this.conn = conn;
+    }
+}
+
+```
+
diff --git "a/09 \346\241\202\346\263\275\347\205\234/2023-05-29\344\275\234\344\270\232.md" "b/09 \346\241\202\346\263\275\347\205\234/2023-05-29\344\275\234\344\270\232.md"
new file mode 100644
index 0000000..1f5f97e
--- /dev/null
+++ "b/09 \346\241\202\346\263\275\347\205\234/2023-05-29\344\275\234\344\270\232.md"	
@@ -0,0 +1,377 @@
+```mysql
+create database band_db charset=utf8;
+use band_db;
+create table band(
+ id int  primary key auto_increment,
+name varchar(30),
+enterprisename varchar(30),
+introduction varchar(50),
+state int default 1 comment'状态:0禁用1启用'
+)comment'品牌';
+insert into band 
+values 
+(1,'三只松鼠','三只松鼠','三只松鼠,好吃不上火',1),
+(2,'优衣库','优衣库','优衣库,服适人生',0),
+(3,'小米','小米科技有限公司','为发烧而生',1);
+```
+
+```java
+package com.dao;
+
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.SQLException;
+
+public class Dao {
+ private Connection conn;
+ private String driver = "com.mysql.jdbc.Driver";
+ private String url ="jdbc:mysql://localhost:3306/band_db?useSSL=false&useUnicode=true&charsetEnding=utf8";
+ private String user="root";
+ private String password="root";
+
+    public Dao() {
+        try {
+            Class.forName(driver);
+            System.out.println("驱动加载成功");
+        } catch (ClassNotFoundException e) {
+            System.out.println("驱动加载失败!");
+            throw new RuntimeException(e);
+        }
+    }
+
+    public Connection getConn() {
+        try {
+            conn = DriverManager.getConnection(url,user,password);
+            System.out.println("数据库连接成功");
+        } catch (SQLException e) {
+            System.out.println("数据库连接失败！");
+            throw new RuntimeException(e);
+        }
+        return conn;
+    }
+
+    public void setConn(Connection conn) {
+        this.conn = conn;
+    }
+}
+
+```
+
+```java
+package com.band;
+
+public class Band {
+    //序号
+    private int id;
+    //品牌名称
+    private String name;
+    //企业名称
+    private String enterprisename;
+    //品牌介绍
+    private String interoduction;
+   //状态
+    private String state;
+    public Band() {
+    }
+
+    public Band(int id, String name, String enterprisename, String interoduction, String state) {
+        this.id = id;
+        this.name = name;
+        this.enterprisename = enterprisename;
+        this.interoduction = interoduction;
+        this.state = state;
+    }
+
+    public int getId() {
+        return id;
+    }
+
+    public void setId(int id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getEnterprisename() {
+        return enterprisename;
+    }
+
+    public void setEnterprisename(String enterprisename) {
+        this.enterprisename = enterprisename;
+    }
+
+    public String getInteroduction() {
+        return interoduction;
+    }
+
+    public void setInteroduction(String interoduction) {
+        this.interoduction = interoduction;
+    }
+
+    public String getState() {
+        return state;
+    }
+
+    public void setState(String state) {
+        this.state = state;
+    }
+}
+```
+
+```java
+package com.servlet;
+
+import com.band.Band;
+import com.dao.Dao;
+
+
+import javax.servlet.ServletException;
+import javax.servlet.annotation.WebServlet;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import java.io.IOException;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+
+@WebServlet(name = "Servlet", value = "/Servlet")
+public class Servlet extends HttpServlet {
+    @Override
+    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+        response.setContentType("text/html;charset=utf-8");
+        request.setCharacterEncoding("utf-8");
+        System.out.println("你调用了get方法");
+        String mess = request.getParameter("submit");
+        if (mess.endsWith("查询")) {
+            Find(request, response);
+        }
+        if (mess.endsWith("添加")) {
+            Add(request, response);
+        }
+        if(mess.endsWith("修改")){
+            Update(request,response);
+        }
+    }
+
+    //查询
+    public void Find(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+        String id = request.getParameter("id");
+        String name = request.getParameter("name");
+        String enterprisename = request.getParameter("enterprisename");
+        String introduction = request.getParameter("introduction");
+        String state = request.getParameter("state");
+        Band band = new Band();
+        Dao dao = new Dao();
+        String sql = "select * from band where id=? and name=? and enterprisename=? and introduction=? and state=?";
+        try {
+            PreparedStatement pre = dao.getConn().prepareStatement(sql);
+            pre.setString(1, id);
+            pre.setString(2, name);
+            pre.setString(3, enterprisename);
+            pre.setString(4,introduction);
+            pre.setString(5,state);
+            ResultSet res = pre.executeQuery();
+            while (res.next()) {
+                id = res.getString("id");
+                name = res.getString("name");
+                enterprisename = res.getString("enterprisename");
+                introduction = res.getString("introduction");
+                state = res.getString("state");
+                band.setId(Integer.parseInt(id));
+                band.setName(name);
+                band.setEnterprisename(enterprisename);
+                band.setInteroduction(introduction);
+                band.setState("state");
+                response.getWriter().write(String.valueOf(band));
+            }
+            res.close();
+        } catch (SQLException e) {
+        }
+    }
+
+    //添加
+    public void Add(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+        String id = request.getParameter("id");
+        String name = request.getParameter("name");
+        String enterprisename = request.getParameter("enterprisename");
+        String introduction = request.getParameter("introduction");
+        String state = request.getParameter("state");
+        Band band = new Band();
+        Dao dao = new Dao();
+        String sql = "insert into band values(?,?,?,?,?)";
+        try {
+            PreparedStatement pre = dao.getConn().prepareStatement(sql);
+            pre.setString(1, id);
+            pre.setString(2, name);
+            pre.setString(3, enterprisename);
+            pre.setString(4,introduction);
+            pre.setString(5,state);
+            int i = pre.executeUpdate();
+            if (i > 0) {
+                band.setId(Integer.parseInt(id));
+                band.setName(name);
+                band.setEnterprisename(enterprisename);
+                band.setInteroduction(introduction);
+                band.setState(state);
+                System.out.println(band);
+                response.getWriter().write("添加成功");
+            } else response.getWriter().write("添加失败");
+            pre.close();
+        } catch (SQLException e) {
+        }
+    }
+    //修改
+public void Update(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+    String id = request.getParameter("id");
+    String name = request.getParameter("name");
+    String enterprisename = request.getParameter("enterprisename");
+    String introduction = request.getParameter("introduction");
+    String state = request.getParameter("state");
+    Band band = new Band();
+    Dao dao = new Dao();
+    String sql = "update band set name=?,enterprisename=?,introduction=?,state=?  where id=?";
+    try {
+        PreparedStatement pre = dao.getConn().prepareStatement(sql);
+        pre.setString(1, name);
+        pre.setString(2,enterprisename);
+        pre.setString(3,introduction);
+        pre.setString(4,state);
+        pre.setString(5,id);
+        int i = pre.executeUpdate();
+        if (i > 0) {
+            band.setId(Integer.parseInt(id));
+            band.setName(name);
+            band.setEnterprisename(enterprisename);
+            band.setInteroduction(introduction);
+            band.setState(state);
+            response.getWriter().write("修改成功");
+        } else response.getWriter().write("修改失败");
+        pre.close();
+    } catch (SQLException e) {
+    }
+}
+    @Override
+    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+        doGet(request, response);
+    }
+}
+
+```
+
+```java
+<%@ page import="com.dao.Dao" %>
+<%@ page import="java.sql.PreparedStatement" %>
+<%@ page import="java.sql.ResultSet" %>
+<%@ page import="java.sql.SQLException" %>
+<%@ page import="com.band.Band" %>
+<%@ page import="javax.xml.crypto.dsig.spec.XSLTTransformParameterSpec" %><%--
+  Created by IntelliJ IDEA.
+  User: MAC
+  Date: 2023/5/27
+  Time: 18:18
+  To change this template use File | Settings | File Templates.
+--%>
+<%@ page contentType="text/html;charset=UTF-8" language="java" %>
+<html>
+<head>
+  <title>主页</title>
+</head>
+<style>
+  table,tr,th,td{
+    border-collapse: collapse;
+    text-align: center;
+    width: 500px;
+  border: 1px dashed}
+</style>
+<body>
+<table>
+  <tr><th>序号</th><th>品牌名称</th><th>企业名称</th><th>品牌名称</th><th>状态</th><th>操作</th></tr>
+  <%
+    Band band = new Band();
+    Dao dao = new Dao();
+    String sql = "select * from band;";
+      PreparedStatement pre = dao.getConn().prepareStatement(sql);
+      ResultSet res = pre.executeQuery();
+      while (res.next()) {
+        String id = res.getString("id");
+        String name = res.getString("name");
+        String enterprisename = res.getString("enterprisename");
+        String introduction = res.getString("introduction");
+        int state = res.getInt("state");
+        band.setId(Integer.parseInt(id));
+        band.setName(name);
+        band.setEnterprisename(enterprisename);
+        band.setInteroduction(introduction);
+        band.setState("state");
+  %>
+  <tr>
+  <td><%=band.getId()%></td><td><%=band.getName()%></td><td><%=band.getEnterprisename()%></td>
+    <td><%=band.getInteroduction()%></td><td><%=band.getState()%></td>
+  <td><a href="update.jsp?id=<%=id%>">修改</a>&nbsp<a href="delete.jsp?id=<%=id%>">删除</a></td>
+</tr>
+  <%}
+    try {
+      res.close();
+    } catch (SQLException e) {
+      throw new RuntimeException(e);
+    }
+  %>
+</table>
+</body>
+</html>
+
+```
+
+```java
+<%@ page import="com.student.Student" %>
+<%@ page import="com.dao.Dao" %>
+<%@ page import="java.sql.PreparedStatement" %>
+<%@ page import="java.sql.ResultSet" %>
+<%@ page import="java.sql.SQLException" %>
+<%@ page import="com.band.Band" %><%--
+  Created by IntelliJ IDEA.
+  User: MAC
+  Date: 2023/5/27
+  Time: 22:48
+  To change this template use File | Settings | File Templates.
+--%>
+<%@ page contentType="text/html;charset=UTF-8" language="java" %>
+<html>
+<head>
+    <title>删除学生</title>
+</head>
+<body>
+<%String id = request.getParameter("id");
+  Band band = new Band();
+  Dao dao = new Dao();
+  String sql = "delete from band where id=?";
+  try {
+    PreparedStatement pre = dao.getConn().prepareStatement(sql);
+    pre.setString(1, id);
+    int i = pre.executeUpdate();
+    if (i > 0) {
+      response.getWriter().write("<script>alert('删除成功！')</script>");
+      response.sendRedirect("index.jsp");
+      request.setAttribute("band",band);
+    } else response.getWriter().write("删除失败");
+    pre.close();
+  } catch (SQLException e) {
+  }%>
+<%  band = (Band) request.getAttribute("band");%>
+<form action="Servlet" method="post">
+  <h1>删除学生</h1>
+  <input type="hidden" name="id" value="<%=band.getId()%>"><br>
+  <input type="submit" name="submit" value="删除">
+</form>
+</body>
+</html>
+
+```
+
-- 
Gitee