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+写一个数据库
+
+```mysql
+# 数据库名称：CompanyManager
+create database CompanyManager charset utf8;
+use CompanyManager;
+
+# 表： Dept (部门信息表)x`z0.0
+create table Dept
+(
+# 字段显示 字段名 数据类型 默认值 备注和说明
+ DeptID int primary key auto_increment, # 部门编号 主键,自动增长列
+ DeptName varchar(20) not null # 部门名称 不允许为空
+);
+#添加数据
+insert into Dept values
+(null,'宣传部'),
+(null,'组织部'),
+(null,'学习部'),
+(null,'学生会');
+
+# 表：Emp (员工信息表)
+create table Emp
+(
+# 字段显示 字段名 数据类型 默认值 备注和说明
+ EmpID int primary key auto_increment, # 员工编号 主键,自动增长列
+ EmpName varchar(20) not null, # 员工姓名 不允许为空
+ Sex char(2) not null, # 性别 不允许为空
+ Age int not null, # 员工年龄 不允许为空
+ Tel varchar(20) unicode not null, # 联系电话 不允许为空（唯一约束）
+ PassWord varchar(12) not null, # 密码 不允许为空
+ DeptID int, # 部门编号 关联部门表DeptID字段
+ foreign key (DeptID) references Dept (DeptID) #外键
+);
+#添加数据
+insert into Emp values
+ (null,'友利奈绪','女',18,'185326','10086',4),
+ (null,'符玄','女',20,'155326','10086',1),
+ (null,'张三','男',18,'1595326','10086',3),
+ (null,'李四','男',18,'185123326','10086',2),
+ (null,'王五','男',18,'18515326','10086',2);
+```
+
+创建dept包
+
+```java
+package dept;
+
+public class Emp {
+ int empId;
+ String empName;
+ String sex;
+ int age;
+ String tel;
+ String password;
+ int deptId;
+ String deptName;
+
+ 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 getPassword() {
+ return password;
+ }
+
+ public void setPassword(String password) {
+ this.password = password;
+ }
+
+ public int getDeptId() {
+ return deptId;
+ }
+
+ public void setDeptId(int deptId) {
+ this.deptId = deptId;
+ }
+
+ public String getDeptName() {
+ return deptName;
+ }
+
+ public void setDeptName(String deptName) {
+ this.deptName = deptName;
+ }
+
+ public Emp(int empId, String empName, String sex, int age, String tel, String password, int deptId, String deptName) {
+ this.empId = empId;
+ this.empName = empName;
+ this.sex = sex;
+ this.age = age;
+ this.tel = tel;
+ this.password = password;
+ this.deptId = deptId;
+ this.deptName = deptName;
+ }
+
+ public Emp() {
+ }
+}
+package dept;
+
+public class Dept {
+ int deptId;
+ String deptName;
+
+ public int getDeptId() {
+ return deptId;
+ }
+
+ public void setDeptId(int deptId) {
+ this.deptId = deptId;
+ }
+
+ public String getDeptName() {
+ return deptName;
+ }
+
+ public void setDeptName(String deptName) {
+ this.deptName = deptName;
+ }
+
+ public Dept(int deptId, String deptName) {
+ this.deptId = deptId;
+ this.deptName = deptName;
+ }
+
+ public Dept() {
+ }
+}
+
+
+```
+
+写一个工具类
+
+```java
+package utils;
+
+import java.sql.*;
+
+public class DBUtil {
+ //定义好数据库主机，库名，字符集，用户名，密码
+ static String URL = "jdbc:mysql:///companymanager?characterEncoding=utf8";
+ static String user = "root";
+ static String pwd = "root";
+
+ static {
+ try {
+ Class.forName("com.mysql.jdbc.Driver");
+ } catch (ClassNotFoundException e) {
+ e.printStackTrace();
+ }
+
+ }
+
+ public static Connection getconn() throws SQLException {
+ Connection conn = DriverManager.getConnection(URL, user, pwd);
+ return conn;
+ }
+
+ public static ResultSet query(String sql, Object... keys) {
+ ResultSet re = null;
+ try {
+ Connection conn = getconn();
+ PreparedStatement pst = conn.prepareStatement(sql);
+ for (int i = 0; i < keys.length; i++) {
+ pst.setObject((i + 1), keys[i]);
+ }
+ re = pst.executeQuery();
+ } catch (SQLException e) {
+ e.printStackTrace();
+ }
+ return re;
+ }
+
+ public static int s(String sql, Object... keys) {
+ int re = 0;
+ try {
+ Connection conn = getconn();
+ PreparedStatement pst = conn.prepareStatement(sql);
+ for (int i = 0; i < keys.length; i++) {
+ pst.setObject((i + 1), keys[i]);
+ }
+ re = pst.executeUpdate();
+ } catch (SQLException e) {
+ e.printStackTrace();
+ }
+ return re;
+ }
+}
+
+```
+
+写一个网页
+
+```html
+<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
+<%--
+ Created by IntelliJ IDEA.
+ User: Administrator
+ Date: 2023-06-08
+ Time: 16:39
+ To change this template use File | Settings | File Templates.
+--%>
+<%@ page contentType="text/html;charset=UTF-8" language="java" %>
+
+
+ Title
+
+
+
+添加
+
+
+
+ | 编号 |
+ 姓名 |
+ 性别 |
+ 年龄 |
+ 电话 |
+ 密码 |
+ 部门 |
+
+
+
+ | ${charloot.deptId} |
+ ${charloot.empName} |
+ ${charloot.sex} |
+ ${charloot.age} |
+ ${charloot.tel} |
+ ${charloot.password} |
+ ${charloot.deptName} |
+
+
+
+
+
+
+
+
+```
+
+写一个Servlet获取
+
+```java
+package sevet;
+
+import dept.Emp;
+import utils.DBUtil;
+
+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("/mi")
+public class a extends HttpServlet {
+ @Override
+ protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+ String sql = "select * from Emp e,dept d where e.DeptID=d.DeptID";
+ ResultSet query = DBUtil.query(sql);
+ ArrayList list = new ArrayList<>();
+ try {
+ while (query.next()) {
+ int id = query.getInt(1);
+ String name = query.getString(2);
+ String sex = query.getString(3);
+ int age = query.getInt(4);
+ String tel = query.getString(5);
+ String password = query.getString(6);
+ int deptid = query.getInt(7);
+ String deptname = query.getString(9);
+ Emp emp = new Emp(id, name, sex, age, tel, password, deptid, deptname);
+ list.add(emp);
+ }
+ } catch (SQLException e) {
+ e.printStackTrace();
+ }
+ request.setAttribute("list", list);
+ request.getRequestDispatcher("/WEB-INF/mi.jsp").forward(request, response);
+ }
+
+ @Override
+ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+
+ }
+}
+
+```
+
+写一个回应类
+
+```java
+package sevet;
+
+import dept.Emp;
+import utils.DBUtil;
+
+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("/search")
+public class Servlet 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");
+ String sql = "select * from Emp e,dept d where e.DeptID=d.DeptID and empName like ?";
+ String username = request.getParameter("username");
+ ResultSet query = DBUtil.query(sql, "%" + username + "%");
+ System.out.println(username);
+ ArrayList list = new ArrayList<>();
+ try {
+ while (query.next()) {
+ int id = query.getInt(1);
+ String name = query.getString(2);
+ String sex = query.getString(3);
+ int age = query.getInt(4);
+ String tel = query.getString(5);
+ String password = query.getString(6);
+ int deptid = query.getInt(7);
+ String deptname = query.getString(9);
+ Emp emp = new Emp(id, name, sex, age, tel, password, deptid, deptname);
+ list.add(emp);
+ }
+ } catch (SQLException e) {
+ e.printStackTrace();
+ }
+ request.setAttribute("list", list);
+ request.getRequestDispatcher("/WEB-INF/mi.jsp").forward(request, response);
+
+ }
+}
+
+
+```
+
+
+