Spring Boot学习随笔- JSP小项目-员工管理系统（验证码生成、增删改查）

2023-12-18 15:31 由扬眉剑出鞘发表于 #后端开发

学习视频：【编程不良人】2021年SpringBoot最新最全教程

第十章、项目开发

实现一个登录注册，增删改查功能的系统

10.1 项目开发流程

需求分析

分析用户主要需求提取项目核心功能，根据核心功能构建页面原型
库表设计：
1. 分析系统有哪些表
2. 分析表之间关联关系
3. 确定字段
详细设计（流程图、伪代码）：

验证库表准确性
功能实现（编码）

环境搭建，具体功能实现
功能测试，部署，上线，运维，维护

全栈式开发：前端+后端+运维

10.2 需求分析

系统有哪些模块？
每个模块功能有哪些？
1. 用户模块：登录、注册、验证码生成
2. 员工模块：查询、删除、更新、添加

10.3 库表设计

用户表：user

员工表：employee

表与表关系：user，employee 独立两张表

创建库表

create database ems;
use ems;
create TABLE user(
id int auto_increment  ,username VARCHAR(40) COMMENT '用户名' ,
realname VARCHAR(40) COMMENT '真实姓名' ,
`password` VARCHAR(50) COMMENT '密码',gender TINYINT(3) COMMENT '性别',
 PRIMARY KEY (`id`) 
);

create TABLE employee(
id int auto_increment,
name VARCHAR(40) COMMENT '姓名',
birthday datetime COMMENT '生日',
salary DOUBLE COMMENT '薪资',
gender TINYINT(3) COMMENT '性别',
PRIMARY KEY(id)
)

10.5 编码环节

技术选型：SpringBoot + MyBatis + JSP + MySQL

环境搭建：Spring Boot + JSP + MyBatis

创建名为ems-jsp的项目，并引入web支持依赖，创建完成

环境搭建

pom.xml依赖导入

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
    <!--jsp解析依赖-->
    <dependency>
        <groupId>org.apache.tomcat.embed</groupId>
        <artifactId>tomcat-embed-jasper</artifactId>
    </dependency>

    <!--引入和MyBatis整合相关的依赖-->
    <!--druid-->
    <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>druid</artifactId>
        <version>1.1.19</version>
    </dependency>
    <!--mysql-->
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
    </dependency>
    <!--mybatis-spring-boot-stater-->
    <dependency>
        <groupId>org.mybatis.spring.boot</groupId>
        <artifactId>mybatis-spring-boot-starter</artifactId>
        <version>3.0.0</version>
    </dependency>

    <!--开启热部署-->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-devtools</artifactId>
    </dependency>
</dependencies>

application.yml:

# 应用服务 WEB 访问端口
server:
  port: 8989
  servlet:
    context-path: /ems-jsp
    jsp:
      init-parameters:
        development: true # 开启jsp模板开发模式

# 配置jsp展示
spring:
  mvc:
    view:
      prefix: /
      suffix: .jsp
  datasource:
    type: com.alibaba.druid.pool.DruidDataSource
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://localhost:3306/ems?characterEncoding=UTF-8
    username: root
    password: 123456

# 配置mybatis
mybatis:
  mapper-locations: classpath:com.baizhi/mapper/*.xml
  type-aliases-package: com.baizhi.entity

# 配置日志
logging:
  level:
    com.baizhi: debug

添加dao包扫描

@SpringBootApplication
@MapperScan("com.baizhi.dao")
public class EmsJspApplication {
    public static void main(String[] args) {
        SpringApplication.run(EmsJspApplication.class, args);
    }

}

10.6 验证码实现

业务逻辑
1. 生成随机字符（依靠工具类VerifyCode）
2. 放入session（与前端传过来的验证码进行比对），放进map（传给前端）
3. 生成图片响应

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>Registration Page</title>
    <link rel="stylesheet" type="text/css" href="css/register.css">
</head>
<body>

<h2>用户注册</h2>
<div class="container">
    <h3 style="color: red">${param.msg}</h3>
    <form action="${pageContext.request.contextPath}/user/register" method="post">
        用户名: <input type="text"  name="username"><br>
        真实姓名: <input type="text" name="realname" ><br>
        密码: <input type="password" name="password" ><br>
<%--        确认密码： <input type="password" name="confirmPassword"><br>--%>
        性别:
        <select name="gender" >
            <option value="1">男</option>
            <option value="0">女</option>
        </select><br>
        <!-- 验证码展示 -->
        <label for="verifyCode">验证码:</label><br>
        <img id="verifyCode" src="" alt="Captcha Image">
        <a href="javascript:" id="refresh">换一张</a>
        <input type="text"  name="code"><br>
        <input type="submit" value="注册">
    </form>
</div>

<script src="js/jquery.js"></script>
<script>
    // jQuery代码
    $(document).ready(function() {
        $('#registerForm').submit(function() {
            return validateRegisterForm();
        });
    });

    // 表单验证
    function validateRegisterForm() {
        var username = $('#username').val(),
            password = $('#password').val(),
        // confirmPassword = $('#confirmPassword').val(),
            realname = $('#realname').val(),
            code = $('#code').val();
        console.log(backCode,code)
        if (username === "" || password === ""  || realname === "" ||  code === "") {
            alert("请填写所有字段和验证码");
            return false;
        }
        if (backCode.toLowerCase() === code.toLowerCase()) {
            alert("验证码填写不正确")
            refreshVerifyCode();// 刷新验证码
            return false;
        }

        // if (password !== confirmPassword) {
        //     alert("密码不匹配");
        //     return false;
        // }
        alert("注册成功，请登录")
        return true;
    }
    var backCode = "";
    // 验证码刷新
    function refreshVerifyCode() {
        $.ajax({
            url: '${pageContext.request.contextPath}/user/verifyCode',
            method: 'GET',
            dataType: 'json',
            success: function(data) {
                console.log(data)
                backCode = data.code;
                $('#verifyCode').attr('src', data.image);
            },
            error: function(error) {
                console.error('error:', error);
            }
        });
    }

    // 初始化页面加载时显示验证码
    refreshVerifyCode();

    // 点击“换一张”按钮时刷新验证码
    $('#refresh').click(function() {
        refreshVerifyCode();
    });
</script>

</body>
</html>

css

body {
    font-family: 'Arial', sans-serif;
    margin: auto;
    justify-content: center;
    align-items: center;
    width: 500px;
    height: 800px;
    /*border: 1px solid red;*/
}

.container {
    padding: 30px;
    background-color: #ffffff;
    border-radius: 8px;
    box-shadow: 0 0 15px rgba(0, 0, 0, 0.1);
    /*border: 1px solid red;*/
}

h2 {
    text-align: center;
}

input[type="text"],
input[type="password"],
input[type="submit"],
select {
    width: calc(100% - 20px);
    margin-bottom: 15px;
    padding: 10px;
    border: 1px solid #dddddd;
    border-radius: 5px;
    transition: border-color 0.3s ease-in-out;
}

input[type="text"]:focus,
input[type="password"]:focus,
select:focus {
    outline: none;
    border-color: #66afe9;
}

input[type="submit"] {
    background-color: #4CAF50;
    color: white;
    border: none;
    cursor: pointer;
    transition: background-color 0.3s ease-in-out;
}

input[type="submit"]:hover {
    background-color: seagreen;
}

验证码实现类

package com.baizhi.utils;
import javax.imageio.ImageIO;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Random;

public class VerifyCode {
    private int width = 100;// 定义图片的width
    private int height = 40;// 定义图片的height
    private int codeCount = 4;// 定义图片上显示验证码的个数
    private int lineCount = 20;// 定义图片上显示干扰线的条数
    private String code = null;// 定义用于保存验证码的字符串
    private BufferedImage buffImg = null;// 定义图片Buffer

    private char[] codeSequence = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'P', 'Q', 'R',
            'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', '1', '2', '3', '4', '5', '6', '7', '8', '9' };

    public VerifyCode() {
        this.createCode();
    }

    /**
     * @param width
     *            图片宽
     * @param height
     *            图片高
     */
    public VerifyCode(int width, int height) {
        this.width = width;
        this.height = height;
        this.createCode();
    }

    /**
     * @param width
     *            图片宽
     * @param height
     *            图片高
     * @param codeCount
     *            字符个数
     * @param lineCount
     *            干扰线条数
     */
    public VerifyCode(int width, int height, int codeCount, int lineCount) {
        this.width = width;
        this.height = height;
        this.codeCount = codeCount;
        this.lineCount = lineCount;
        this.createCode();
    }

    public void createCode() {
        int x = 0, fontHeight = 0, codeY = 0;
        int red = 0, green = 0, blue = 0;

        x = width / (codeCount + 2);// 每个字符的宽度
        fontHeight = height - 2;// 字体的高度
        codeY = height - 4;

        // 图像buffer
        buffImg = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        Graphics g = buffImg.createGraphics();
        // 创建一个随机数生成器类
        Random random = new Random();
        // 将图像填充为白色
        g.setColor(Color.WHITE);
        g.fillRect(0, 0, width, height);
        // 创建字体，字体的大小应该根据图片的高度来定。
        Font font = new Font("Fixedsys", Font.PLAIN, fontHeight);
        // 设置字体。
        g.setFont(font);

        for (int i = 0; i < lineCount; i++) {
            // 设置随机开始和结束坐标
            int xs = random.nextInt(width);// x坐标开始
            int ys = random.nextInt(height);// y坐标开始
            int xe = xs + random.nextInt(width / 8);// x坐标结束
            int ye = ys + random.nextInt(height / 8);// y坐标结束

            // 生成随机颜色
            red = random.nextInt(255);
            green = random.nextInt(255);
            blue = random.nextInt(255);
            g.setColor(new Color(red, green, blue));
            g.drawLine(xs, ys, xe, ye);
        }

        // randomCode记录随机产生的验证码
        StringBuffer randomCode = new StringBuffer();
        // 随机产生codeCount个字符的验证码。
        for (int i = 0; i < codeCount; i++) {
            // 得到随机产生的验证码数字。
            String strRand = String.valueOf(codeSequence[random.nextInt(codeSequence.length)]);
            // 用随机产生的颜色将验证码绘制到图像中。
            red = random.nextInt(255);
            green = random.nextInt(255);
            blue = random.nextInt(255);
            g.setColor(new Color(red, green, blue));
            g.drawString(strRand, (i + 1) * x, codeY);
            // 将产生的四个随机数组合在一起。
            randomCode.append(strRand);
        }
        // 将四位数字的验证码保存到Session中。
        code = randomCode.toString();
    }

    public void write(String path) throws IOException {
        OutputStream sos = new FileOutputStream(path);
        this.write(sos);
    }

    public void write(OutputStream sos) throws IOException {
        ImageIO.write(buffImg, "png", sos);
        sos.close();
    }

    public BufferedImage getBuffImg() {
        return buffImg;
    }

    public String getCode() {
        return code;
    }
}

验证码生成请求

@Controller
@RequestMapping("user")
public class UserController {

    /**
     * 生成验证码
     */
		@ResponseBody
    @RequestMapping("verifyCode")
    public Map<String, String> verifyCode(HttpServletRequest request) throws IOException {
        Map<String,String> map = new HashMap<>();
        // 1.使用工具类生成验证码
        VerifyCode vc = new VerifyCode(120, 40, 4, 100);
        String code = vc.getCode();
        map.put("code", code);
        // 2. 获取验证码的BufferedImage对象
        BufferedImage captchaImage = vc.getBuffImg();
        //4.将图片转为base64 [放入src,可以直接显示图片]
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        ImageIO.write(captchaImage, "png", outputStream);
        byte[] imageBytes = outputStream.toByteArray();
        String image = "data:image/png;base64," + Base64Utils.encodeToString(imageBytes);
        map.put("image", image);
        return map;
    }
}

10.7 注册实现

业务逻辑

Service

@Service
@Transactional
public class UserServiceImpl implements UserService {

    @Autowired
    private UserDao userDao;

    @Override
    public void register(User user) {
        User userDB = userDao.findByUserName(user.getUsername());
        if (!ObjectUtils.isEmpty(userDB)) {
            throw new RuntimeException("用户名已存在");
        }
        // 注册之前给密码进行加密
        String passwordSecret = DigestUtils.md5DigestAsHex(user.getPassword().getBytes(StandardCharsets.UTF_8));
        user.setPassword(passwordSecret);
        userDao.save(user);

    }
}

mapper语句

<select id="findByUserName" resultType="com.baizhi.entity.User">
    select id,username,realname,password,gender from `user`
    where username = #{username}
</select>

api

@Autowired
private UserService userService;

@RequestMapping("register")
public String register(User user, String code, HttpSession session) {
    log.debug("接受的验证码：{}", code);
    log.debug("User：{}", user);
    // 比较验证
    try {
        String sessionCode = session.getAttribute("code").toString();
        if (!sessionCode.equalsIgnoreCase(code)) {
            throw new RuntimeException("验证码输入错误！！！");
        }
        userService.register(user);
    } catch (RuntimeException e) {
        e.printStackTrace();
        return "redirect:/register.jsp?msg=" + UriEncoder.encode(e.getMessage());
    }
    return "redirect:/login.jsp";
}

10.8用户登录

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>Login Page</title>
    <link rel="stylesheet" href="css/register.css">
</head>
<body>
<h2>用户登录</h2>
<h3 style="color: red">${param.msg}</h3>
<form action="${pageContext.request.contextPath}/employee/list" method="post">
    <label for="username">用户名:</label><br>
    <input type="text" id="username" name="username"><br>
    <label for="password">密码:</label><br>
    <input type="password" id="password" name="password"><br>
    <input type="submit" value="登录">
    <input type="button" onclick="window.location.href='register.jsp'"  value="注册">
</form>
</body>
</html>

ServiceImpl

@Override
public User login(String username, String password) {
    //1. 根据用户名查询数据库是否存在
    User user = userDao.findByUserName(username);
    //2.判断对象是否存在
    if (ObjectUtils.isEmpty(user)) {
        throw new RuntimeException("用户名输入错误！");
    }
    //3.判断密码正确性
    String digestPassword = DigestUtils.md5DigestAsHex(password.getBytes(StandardCharsets.UTF_8));
    if (!user.getPassword().equals(digestPassword)) {
        throw new RuntimeException("密码错误！");
    }
    return user;
}

UserController

@RequestMapping("login")
public String login(String username, String password,HttpSession session) throws UnsupportedEncodingException {
    log.debug("接受到的用户名：{},接收到的密码：{}", username, password);
    try {
        // 1.执行登录业务逻辑
        User user = userService.login(username, password);
        // 2.登录成功，保存用户信息
        session.setAttribute("user", user);
    } catch (Exception e) {
        e.printStackTrace();
        return "redirect:/login.jsp?msg=" + UriEncoder.encode(e.getMessage());
    }
    return "redirect:/emplist.jsp";
}

10.9 员工列表展示

在数据库查询所有员工信息
在页面中进行展示

emplist.jsp

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %>
<%@ page language="java" contentType="text/html; charset=UTF-8"
         pageEncoding="UTF-8" %>
<!DOCTYPE html>
<html>
<head>
    <title>用户列表</title>
    <link rel="stylesheet" href="${pageContext.request.contextPath}/css/emplist.css">
</head>
<body>
    <div id="container">
        <h2>用户列表</h2>
        <table>
            <tr>
                <th>ID</th>
                <th>姓名</th>
                <th>性别</th>
                <th>薪水</th>
                <th>生日</th>
                <th>操作</th>
            </tr>
            <c:forEach var="employee" items="${requestScope.employees}">
                <tr>
                    <td>${employee.id}</td>
                    <td>${employee.name}</td>
                    <td>${employee.gender?'男':'女'}</td>
                    <td>${employee.salary}</td>
                    <td><fmt:formatDate value="${employee.birthday}" pattern="yyyy-MM-dd"/></td>
                     <td>
                        <a href="javascript:;">删除</a>
                        <a href="javascript:;">修改</a>
                    </td>
                </tr>
            </c:forEach>
        </table>
        <a href="javascript:;">添加员工信息</a>
    </div>

</body>
</html>

emplist.css

body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
}

#container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

h2 {
    text-align: center;
}
table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 20px;
}

th, td {
    padding: 10px;
    text-align: left;
    border: 1px solid #ccc;
}

thead {
    background-color: #f2f2f2;
}

div > button {
    margin: 5px;
    padding: 5px 10px;
    border: none;
    background-color: #007bff;
    color: #fff;
    cursor: pointer;
}

div > button:hover {
    background-color: #0056b3;
}

select, button {
    padding: 5px;
}

div > span {
    margin: 0 10px;
    font-weight: bold;
}

label {
    font-weight: bold;
}

Service

@Service
@Transactional
public class EmployeeServiceImpl implements EmployeeService {

    private final EmployeeDao employeeDao;

    @Autowired
    public EmployeeServiceImpl(EmployeeDao employeeDao) {
        this.employeeDao = employeeDao;
    }

    @Override
    public List<Employee> list() {
        return employeeDao.list();
    }
}

EmployeeController

@Controller
@RequestMapping("employee")
public class EmployeeController {

    private EmployeeService employeeService;

    @Autowired
    public EmployeeController(EmployeeService employeeService) {
        this.employeeService = employeeService;
    }

    /**
     * 员工列表
     *
     * @return
     */
    @RequestMapping("list")
    public String listEmployee(HttpServletRequest request, Model model) {
        //1. 获取员工列表
        List<Employee> employees = employeeService.list();
//        request.setAttribute("employees", employees);
        model.addAttribute("employees", employees);
        return "emplist";
    }
}

10.10 添加员工信息

在EmplyeeController开发一个添加方法
接收员工信息
将员工信息保存到数据库
跳转到员工列表展示数据

addEmp.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
         pageEncoding="UTF-8" %>
<!DOCTYPE html>
<html>
<head>
    <title>添加员工</title>
    <link rel="stylesheet" href="css/addEmp.css">
</head>
<body>
    <h2>添加员工</h2>
    <div id="container">
        <form action="${pageContext.request.contextPath}/employee/add" method="post">
            <table>
                <tr>
                    <td>姓名:</td>
                    <td><input type="text" id="name" name="name"></td>
                </tr>
                <tr>
                    <td>薪水:</td>
                    <td><input type="text" id="salary" name="salary"></td>
                </tr>
                <tr>
                    <td>生日:</td>
                    <td><input type="text" id="birthday" name="birthday"></td>
                </tr>
                <tr>
                    <td>性别:</td>
                    <td>
                        <select name="gender" >
                            <option value="1">男</option>
                            <option value="0">女</option>
                        </select>
                    </td>
                </tr>
                <tr>
                    <td colspan="2"><input type="submit" value="添加"></td>
                </tr>
            </table>
        </form>
    </div>

</body>
</html>

addEmp.css

body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
}
#container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

h2 {
    text-align: center;
}
table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 20px;
    color: #212529;
}
td, th {
    vertical-align: top;
    padding: 10px;
    text-align: left;
    border: 1px solid #ccc;
}
input[type="text"], input[type="date"], select {
    width: 60%;
    padding: .375rem .75rem;
    border: 1px solid #ced4da;
    border-radius: .25rem;
}
input[type="submit"] {
    color: #fff;
    background-color: #007bff;
    border-color: #007bff;
    padding: .375rem .75rem;
    border-radius: .25rem;
}

EmployeeDaomapper.xml

<insert id="add" parameterType="Employee" useGeneratedKeys="true" keyProperty="id">
    INSERT INTO `ems`.`employee`(`id`, `name`, `birthday`, `salary`, `gender`) VALUES (#{id},#{name},#{birthday},#{salary},#{gender});
</insert>

EmployeeServiceImpl

public void addEmployee(Employee employee) {
    employeeDao.add(employee);
}

Controller

@RequestMapping("add")
public String addEmployee(Employee employee) {
    log.debug("员工信息：{}", employee);
    //1. 保存员工信息
    employeeService.addEmployee(employee);
    return "redirect:/employee/list";
}

10.11 更新员工信息

显示员工信息
1. 根据id查询员工信息
2. 将对象放进作用域
3. 跳转到更新页面

UpdateEmp.jsp

<%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %>
<%@ page language="java" contentType="text/html; charset=UTF-8"
         pageEncoding="UTF-8" %>
<!DOCTYPE html>
<html>
<head>
    <title>修改员工信息</title>
    <link rel="stylesheet" href="${pageContext.request.contextPath}/css/updateEmp.css">
</head>
<body>
    <div id="container">
        <h2>修改员工信息</h2>
        <form action="${pageContext.request.contextPath}/employee/update" method="post">
            <input type="text" id="id" name="id" value="${employee.id}" style="display: none">
            <label for="name">姓名:</label><br> 
            <input type="text" id="name" name="name" value="${employee.name}"><br>
            <label for="gender">性别:</label><br>
            <select id="gender" name="gender">
                <option value="1" ${employee.gender?'selected':''}>男</option>
                <option value="0" ${!employee.gender?'selected':''}>女</option>
            </select><br>
            <label for="salary">薪水:</label><br>
            <input type="text" id="salary" name="salary" value="${employee.salary}"><br>
            <label for="birthday">生日:</label><br>
            <input type="text" id="birthday" name="birthday" value="<fmt:formatDate value='${employee.birthday}' pattern='yyyy/MM/dd'/>"/><br>
            <input type="submit" value="提交">
        </form>
    </div>
</body>
</html>

UpdateEmp.css

body {
    font-family: Arial, sans-serif;
}

#container {
    width: 300px;
    margin: 0 auto;
    padding: 20px;
    border: 1px solid #ccc;
    border-radius: 5px;
    background-color: #f8f8f8;
}

h2 {
    text-align: center;
    color: #333;
}

label {
    font-weight: bold;
    color: #555;
}

input[type="text"], input[type="date"],select {
    width: 70%;
    padding: 10px;
    margin: 5px 0 15px;
    border: 1px solid #ccc;
    border-radius: 3px;
}

input[type="submit"] {
    width: 100%;
    padding: 10px;
    color: white;
    background-color: #007BFF;
    border: none;
    border-radius: 3px;
    cursor: pointer;
}

input[type="submit"]:hover {
    background-color: #0056b3;
}

Controller

@RequestMapping("detail")
public String detailEmployee(Integer id, Model model) {
    log.debug("接收的id:{}",id);
    Employee employee = employeeService.idByEmployee(id);
    model.addAttribute("employee", employee);
    return "updateEmp";
}

更改员工信息
1. 获取更新后的员工信息
2. 更新数据库

Controller

@RequestMapping("update")
public String updateEmployee(Employee employee) {
    log.debug("修改的员工信息：{}", employee);
    employeeService.updateEmployee(employee);
    return "redirect:/employee/list";
}

10.12 删除员工

传递id给后端进行数据库删除
返回employee/list重新查数据库刷新

emplist.jsp

<a href="javascript:;" onclick="deleteEmployee()">删除</a>
 <script>
     function deleteEmployee(){
         if (window.confirm('确定删除这条记录吗')) {
             location.href= '${pageContext.request.contextPath}/employee/delete?id=${employee.id}'
         }
     }
 </script>

Controller

@RequestMapping("delete")
public String deleteEmployee(Integer id) {
    log.debug("接收的id：{}", id);
    employeeService.deleteEmployee(id);
    return "redirect:/employee/list";
}

mapper

<delete id="deleteEmployee">
    delete from `employee`where id =#{id}
</delete>

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