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+++ "b/15 \346\262\210\347\206\231\347\245\245/20230611 \344\275\234\344\270\232.md"	
@@ -0,0 +1,268 @@
+### bean
+
+```java
+package bean;
+
+public class Emp {
+    private int empID;
+    private String empName;
+    private String sex;
+    private int age;
+    private String tel;
+    private String deptID;
+
+    @Override
+    public String toString() {
+        return "Emp{" +
+                "empID=" + empID +
+                ", empName='" + empName + '\'' +
+                ", sex='" + sex + '\'' +
+                ", age=" + age +
+                ", tel='" + tel + '\'' +
+                ", deptID='" + deptID + '\'' +
+                '}';
+    }
+
+    public int getEmpID() {
+        return empID;
+    }
+
+    public void setEmpID(int empID) {
+        this.empID = empID;
+    }
+
+    public String getEmpName() {
+        return empName;
+    }
+
+    public void setEmpName(String empName) {
+        this.empName = empName;
+    }
+
+    public String getSex() {
+        return sex;
+    }
+
+    public void setSex(String sex) {
+        this.sex = sex;
+    }
+
+    public int getAge() {
+        return age;
+    }
+
+    public void setAge(int age) {
+        this.age = age;
+    }
+
+    public String getTel() {
+        return tel;
+    }
+
+    public void setTel(String tel) {
+        this.tel = tel;
+    }
+
+    public String getDeptID() {
+        return deptID;
+    }
+
+    public void setDeptID(String deptID) {
+        this.deptID = deptID;
+    }
+
+    public Emp(int empID, String empName, String sex, int age, String tel, String deptID) {
+        this.empID = empID;
+        this.empName = empName;
+        this.sex = sex;
+        this.age = age;
+        this.tel = tel;
+        this.deptID = deptID;
+    }
+
+    public Emp() {
+    }
+}
+
+```
+
+
+
+### servlet
+
+```java
+package servlet;
+
+import Util.Jdbc;
+import bean.Emp;
+
+import javax.servlet.*;
+import javax.servlet.http.*;
+import javax.servlet.annotation.*;
+import java.io.IOException;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.ArrayList;
+
+@WebServlet(name = "select", value = "/select")
+public class select extends HttpServlet {
+    @Override
+    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+        ResultSet re = Jdbc.select("select * from Dept a,emp b where a.DeptID=b.DeptID");
+        ArrayList<Emp> list = new ArrayList<>();
+        try {
+            while (re.next()) {
+                list.add(new Emp(
+                        re.getInt(1),
+                        re.getString(4),
+                        re.getString(5),
+                        re.getInt(6),
+                        re.getString(7),
+                        re.getString(2)
+                ));
+            }
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+        request.setAttribute("list", list);
+        request.getRequestDispatcher("WEB-INF/index.jsp").forward(request, response);
+    }
+
+    @Override
+    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+        request.setCharacterEncoding("utf-8");
+        String name = request.getParameter("name");
+        ResultSet re = Jdbc.select("select * from Dept a,emp b where a.DeptID=b.DeptID and EmpName like ?", "%"+name+"%");
+        ArrayList<Emp> list = new ArrayList<>();
+        try {
+            while (re.next()) {
+                list.add(new Emp(
+                        re.getInt(1),
+                        re.getString(4),
+                        re.getString(5),
+                        re.getInt(6),
+                        re.getString(7),
+                        re.getString(2)
+                ));
+            }
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+        request.setAttribute("list", list);
+        request.getRequestDispatcher("WEB-INF/index.jsp").forward(request, response);
+    }
+}
+
+
+```
+
+
+
+### util
+
+```java
+package Util;
+
+import java.sql.*;
+
+public class Jdbc {
+    static
+    {
+        try {
+            Class.forName("com.mysql.jdbc.Driver");
+        } catch (ClassNotFoundException e) {
+            throw new RuntimeException(e);
+        }
+    }
+    private static Connection getConn(){
+        String url = "jdbc:mysql://localhost:3306/test?characterEncoding=utf8";
+        try {
+            return DriverManager.getConnection(url,"root","sxxddytdn");
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+    }
+    public static ResultSet select(String sql ,String...arr){
+        try {
+            PreparedStatement pst = getConn().prepareStatement(sql);
+            for (int i = 0; i < arr.length; i++) {
+                pst.setString((i+1),arr[i]);
+            }
+            return pst.executeQuery();
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+    }
+    public static int update(String sql ,String...arr){
+        try {
+            PreparedStatement pst = getConn().prepareStatement(sql);
+            for (int i = 0; i < arr.length; i++) {
+                pst.setString((i+1),arr[i]);
+            }
+            return pst.executeUpdate();
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+    }
+}
+
+```
+
+
+
+### jsp
+
+```jsp
+<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
+
+<%--
+  Created by IntelliJ IDEA.
+  User: Administrator
+  Date: 2023-06-10
+  Time: 15:07
+  To change this template use File | Settings | File Templates.
+--%>
+<%@ page contentType="text/html;charset=UTF-8" language="java" %>
+<html>
+<head>
+    <title>$Title$</title>
+</head>
+<style>
+    td,th{
+        width: 100px;
+    }
+</style>
+<body>
+<form action="/select" method="post">
+    姓名：<input type="text" name="name">
+    <input type="submit" value="查询">
+</form>
+<table border="1" cellspacing="0">
+    <tr>
+        <th>编号</th>
+        <th>姓名</th>
+        <th>性别</th>
+        <th>年龄</th>
+        <th>电话</th>
+        <th>所属部门</th>
+    </tr>
+<c:forEach items="${list}" var="e">
+    <tr>
+        <td>${e.empID}</td>
+        <td>${e.empName}</td>
+        <td>${e.sex}</td>
+        <td>${e.age}</td>
+        <td>${e.tel}</td>
+        <td>${e.deptID}</td>
+    </tr>
+</c:forEach>
+</table>
+</body>
+</html>
+
+```
+
+
+
+
+