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@@ -0,0 +1,283 @@
+## MySQL
+
+~~~java
+create database student_db character set utf8;
+use student_db;
+create table student(
+    id int primary key auto_increment,
+    name varchar(20),
+    sex varchar(20)
+);
+insert into student values
+(null,'蔡泽钦','女'),
+(null,'菜则亲','男'),
+(null,'菜择沁','女');
+~~~
+
+## DButil
+
+~~~java
+package com.sonyang.servlet;
+
+import java.sql.*;
+
+public class DBUtil {
+    private static final String url= "jdbc:mysql://localhost:3306/student_db?useSSL=false&useUnicode=true&characterEncoding=utf8";
+    private static final String username="root";
+    private static final String password="root";
+    static {
+        try {
+            Class.forName("com.mysql.jdbc.Driver");
+        } catch (ClassNotFoundException e) {
+            throw new RuntimeException(e);
+        }
+
+    }
+    public static Connection getConn() throws SQLException {
+        Connection conn = DriverManager.getConnection(url,username,password);
+        return conn;
+    }
+    //查询
+    public static ResultSet query(String sql,String ...keys) throws SQLException {
+        Connection conn = getConn();
+        PreparedStatement pst = conn.prepareStatement(sql);
+        for (int i = 0; i < keys.length ; i++) {
+            pst.setString((i+1),keys[i]);
+        }
+        ResultSet rs = pst.executeQuery();
+        return rs;
+    }
+    //更新
+    public static int update(String sql,String ...keys) throws SQLException {
+        Connection conn = getConn();
+        PreparedStatement pst = conn.prepareStatement(sql);
+        for (int i = 0; i < keys.length ; i++) {
+            pst.setString((i+1),keys[i]);
+        }
+        int i = pst.executeUpdate();
+        return i;
+
+    }
+    //释放资源
+    public static void close(Connection conn,PreparedStatement pst,ResultSet rs) throws SQLException {
+        if (rs!=null){
+            rs.close();
+        }
+        if (pst!=null){
+            pst.close();
+        }
+        if (conn!=null){
+            conn.close();
+        }
+    }
+}
+
+~~~
+
+## 测试类
+
+查询
+
+~~~java
+package com.sonyang.servlet;
+
+import javax.servlet.*;
+import javax.servlet.http.*;
+import javax.servlet.annotation.*;
+import java.io.IOException;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+
+@WebServlet("/select")
+public class Select extends HttpServlet {
+    @Override
+    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+    }
+
+    @Override
+    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+        request.setCharacterEncoding("utf-8");
+        response.setContentType("text/html;charset=utf-8");
+        String sql = "select * from student where id=?";
+        String id = request.getParameter("id");
+        try {
+            ResultSet rs = DBUtil.query(sql,id);
+            while (rs.next()){
+                int id1 = rs.getInt("id");
+                String name2 = rs.getString("name");
+                String sex3 = rs.getString("sex");
+                response.getWriter().write(id1+"\t"+name2+"\t"+sex3+"<br/>");
+            }
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+    }
+}
+
+~~~
+
+修改
+
+~~~java
+package com.sonyang.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 java.io.IOException;
+import java.sql.SQLException;
+
+@WebServlet("/update")
+public class Update extends HttpServlet {
+    @Override
+    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+
+    }
+
+    @Override
+    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        req.setCharacterEncoding("utf8");
+        resp.setContentType("text/html;charset=utf-8");
+        String sql = "update student set name=?,sex=? where id=?";
+        String id = req.getParameter("id");
+        String name = req.getParameter("name");
+        String sex = req.getParameter("sex");
+        try {
+            int i = DBUtil.update(sql, name, sex,id);
+            if (i > 0) {
+                resp.getWriter().write("修改成功");
+            } else {
+                resp.getWriter().write("修改失败");
+            }
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+
+    }
+}
+~~~
+
+删除
+
+~~~java
+package com.sonyang.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 java.io.IOException;
+import java.sql.SQLException;
+
+@WebServlet("/delete")
+public class Delete extends HttpServlet {
+    @Override
+    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        super.doGet(req, resp);
+    }
+
+    @Override
+    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        req.setCharacterEncoding("utf-8");
+        resp.setContentType("text/html;charset=utf-8");
+        String sql = "delete  from student  where id=?";
+        String id = req.getParameter("id");
+        try {
+            int i = DBUtil.update(sql, id);
+            if(i>0){
+                resp.getWriter().write("删除成功");
+            }else {
+                resp.getWriter().write("删除失败");
+            }
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+    }
+}
+
+~~~
+
+增加
+
+~~~java
+package com.sonyang.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 java.io.IOException;
+import java.sql.SQLException;
+
+@WebServlet("/add")
+public class Add extends HttpServlet {
+    @Override
+    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+
+    }
+
+    @Override
+    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        req.setCharacterEncoding("utf-8");
+        resp.setContentType("text/html;charset=utf-8");
+        String sql = "insert into student values (?,?,?)";
+        String id = req.getParameter("id");
+        String name = req.getParameter("name");
+        String sex = req.getParameter("sex");
+        try {
+            int i = DBUtil.update(sql,id,name,sex);
+            if(i>0){
+                resp.getWriter().write("添加成功");
+            }else {
+                resp.getWriter().write("添加失败");
+            }
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+    }
+}
+
+~~~
+
+HTML
+
+~~~jsp
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <title>学生管理系统</title>
+</head>
+<body>
+<h2>查询学生信息</h2>
+<form action="./select" method="post">
+    查询的学生编号 <input type="text" name="id"><br>
+    <input type="submit" value="查询">
+</form>
+<h2>添加学生信息</h2>
+<form action="./add" method="post">
+    添加的学生编号 <input type="text" name="id"><br>
+    添加的学生名字 <input type="text" name="name"><br>
+    添加的学生性别 <input type="text" name="sex"><br>
+    <input type="submit" value="添加">
+</form>
+<h2>删除学生信息</h2>
+<form action="./delete" method="post">
+    删除的学生编号 <input type="text" name="id"><br>
+    <input type="submit" value="删除">
+</form>
+<h2>输入学生编号修改信息</h2>
+<form action="./update" method="post">
+    修改的学生编号<input type="text" name="id"><br>
+    修改后的学生名字 <input type="text" name="name"><br>
+    修改后的学生性别 <input type="text" name="sex"><br>
+    <input type="submit" value="修改">
+</form>
+</body>
+</html>
+~~~
+