Spring boot+mybatis+thymeleaf 实现登录注册增删改查功能的示例代码

本文重在实现理解，过滤器，业务，逻辑需求，样式请无视。。

项目结构如下

1.idea新建Spring boot项目，在pom中加上thymeleaf和mybatis支持。pom.xml代码如下

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 <modelVersion>4.0.0</modelVersion>
 <parent>
 <groupId>org.springframework.boot</groupId>
 <artifactId>spring-boot-starter-parent</artifactId>
 <version>2.1.3.RELEASE</version>
 <relativePath/> <!-- lookup parent from repository -->
 </parent>
 <groupId>com.jz</groupId>
 <artifactId>table</artifactId>
 <version>0.0.1-SNAPSHOT</version>
 <name>table</name>
 <description>Demo project for Spring Boot</description>

 <properties>
 <java.version>1.8</java.version>
 </properties>

 <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>

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

 <dependency>
 <groupId>org.mybatis.spring.boot</groupId>
 <artifactId>mybatis-spring-boot-starter</artifactId>
 <version>1.3.1</version>
 </dependency>
 <dependency>
 <groupId>mysql</groupId>
 <artifactId>mysql-connector-java</artifactId>
 <scope>runtime</scope>
 </dependency>

 </dependencies>

 <build>
 <plugins>
 <plugin>
 <groupId>org.springframework.boot</groupId>
 <artifactId>spring-boot-maven-plugin</artifactId>
 </plugin>
 </plugins>
 </build>

</project>

2. 在项目resources目录下新建mybatis文件夹，用于存放mybatis配置文件。 在 application.properties 中配置本地数据源和mybatis配置文件地址, application.properties代码如下

spring.datasource.driverClassName=com.mysql.cj.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/student?useUnicode=true&characterEncoding=utf-8&useSSL=false&serverTimezone=UTC
spring.datasource.username=用户名
spring.datasource.password=密码
spring.jpa.showSql=true

mybatis:
mybatis.type-aliases-package=com.jz.table.entity
mybatis.mapper-locations=mybatis/*.xml

com.mysql.cj.jdbc.Driver 是 mysql-connector-java 6中的，需要指定时区serverTimezone

2.2在启动类上加上扫描的Dao包

package com.jz.table;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
@MapperScan("com.jz.table.dao")
public class TableApplication {

 public static void main(String[] args) {
 SpringApplication.run(TableApplication.class, args);
 }

}

3.数据库建两个表admin和userinfo用于登录和操作用

2019.10.3 现在mysql不能用admin作为表名了，请注意一下

4.开始写代码

entity:实体代码

1.Admin实体类

package com.jz.table.entity;

public class Admin {
 private Integer id;
 private String name;
 private Integer password;
 private String job;

 public Admin() {
 }

 public Admin(Integer id, String name, Integer password, String job) {
 this.id = id;
 this.name = name;
 this.password = password;
 this.job = job;
 }

 public Integer getId() {
 return id;
 }

 public void setId(Integer id) {
 this.id = id;
 }

 public String getName() {
 return name;
 }

 public void setName(String name) {
 this.name = name;
 }

 public Integer getPassword() {
 return password;
 }

 public void setPassword(Integer password) {
 this.password = password;
 }

 public String getJob() {
 return job;
 }

 public void setJob(String job) {
 this.job = job;
 }
}

2.UserInfo实体类

package com.jz.table.entity;

public class UserInfo {
 private Integer id;
 private String name;
 private Integer age;
 private String sex;
 public UserInfo() {
 }
 public UserInfo(Integer id, String name, Integer age, String sex) {
 this.id = id;
 this.name = name;
 this.age = age;
 this.sex = sex;
 }
 public Integer getId() {
 return id;
 }

 public void setId(Integer id) {
 this.id = id;
 }

 public String getName() {
 return name;
 }

 public void setName(String name) {
 this.name = name;
 }

 public Integer getAge() {
 return age;
 }

 public void setAge(Integer age) {
 this.age = age;
 }

 public String getSex() {
 return sex;
 }

 public void setSex(String sex) {
 this.sex = sex;
 }
}

Dao层代码
1.AdminDao

package com.jz.table.dao;

import com.jz.table.entity.Admin;

public interface AdminDao {
 //登录判断
 Admin login(Admin admin);
 //注册
 int addAdmin(Admin admin);
}

2.UserDao

package com.jz.table.dao;

import com.jz.table.entity.UserInfo;

import java.util.List;

public interface UserDao {
 //查
 List<UserInfo> findall();
 //增
 int adduser(UserInfo user);
 //根据Id查，用于修改时页面回显数据
 UserInfo findByid(Integer id);
 //修改
 int updateUser(UserInfo user);
 //删除
 int delUser(Integer id);
}

3.XML文件，因为没有业务逻辑，service省了，controller中直接引入dao
1.AdminMapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="com.jz.table.dao.AdminDao">
 <select id="login" parameterType="com.jz.table.entity.Admin" resultType="com.jz.table.entity.Admin">
 select name,job FROM admin WHERE name = #{name} AND password = #{password}
 </select>

 <insert id="addAdmin" parameterType="com.jz.table.entity.Admin">
 INSERT INTO admin (name,password,job) VALUES (#{name},#{password},#{job});
 </insert>
</mapper>

2.UserMapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="com.jz.table.dao.UserDao">
 <select id="findall" resultType="com.jz.table.entity.UserInfo">
 select * from userinfo
 </select>

 <insert id="adduser" parameterType="com.jz.table.entity.UserInfo">
 INSERT INTO userinfo(name,age,sex) VALUES (#{name},#{age},#{sex})
 </insert>

 <select id="findByid" parameterType="java.lang.Integer" resultType="com.jz.table.entity.UserInfo">
 SELECT * FROM userinfo where id = #{id}
 </select>

 <update id="updateUser" parameterType="com.jz.table.entity.UserInfo">
 update userinfo SET name=#{name },age =#{age},sex=#{sex} WHERE id = #{id}
 </update>

 <delete id="delUser" parameterType="java.lang.Integer">
 DELETE from userinfo WHERE id = #{id}
 </delete>
</mapper>

4.页面,在templates文件夹下新建public和user文件夹用来存放公共页面和user操作页面
public文件夹下新建成功、失败提示页
1.success.html

<!DOCTYPE html>
<!--引入thymeleaf-->
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
 <meta charset="UTF-8">
 <title>操作成功提示页</title>

</head>
<body>
<h1>操作成功</h1>

<a href="/index" rel="external nofollow" rel="external nofollow" > 返回首页</a>
</body>
</html>

2.false.html

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
 <meta charset="UTF-8">
 <title>操作失败提示页</title>
 <script th:src="@{/js/jquery-1.8.0.min.js}"></script>

</head>
<body>
<h1>操作失败，请检查数据重试</h1>
<input onclick="history.go(-1)" type="button" value="返回">

</body>
</html>

4.2在templates文件夹下新建login和register页面作为登录和注册页面
1.login.html

<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <title>首页</title>

 <style>
 /*a标签去下划线和点击不变色，div内容居中*/
 a{
 text-decoration: none;
 color: #333333;
 }
 #idiv{text-align: center;border-radius: 20px;
 width: 300px;
 height: 350px;
 margin: auto;
 position: absolute;
 top: 0;
 left: 0;
 right: 0;
 bottom: 0;}
 </style>
</head>
<body>
<div id="idiv">
 <form action="/gologin" method="post">
 请输入姓名<input id="name" name="name" required="required"><br><br>
 请输入密码<input id="password" name="password" type="password" placeholder="仅支持正整数" required="required"><br><br>
 <input type="submit" value="登录"> <button> <a href="/goregister" rel="external nofollow" >注册</a></button>
 </form>
</div>
</body>
</html>

2.register.html

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
 <meta charset="UTF-8">
 <title>账号注册</title>
 <script th:src="@{/js/jquery-1.8.0.min.js}"></script>
</head>
<body>
<h2>账号注册</h2>
请输入姓名：<input type="text" id="name"/><br><br>
请输入密码：<input type="password" id="password" placeholder="仅支持整数" /><br><br>
请确认密码：<input type="password" id="passwordTwo" placeholder="仅支持整数"/><br><br>
请选择角色：<select id="job" style="width: 173px">
 <option value="管理员">管理员</option>
 </select><br><br>
<button onclick="register()">注册</button>
</body>
<script>
 function register() {
 var name = $("#name").val();
 var password1 = $("#password").val();
 var password2 = $("#passwordTwo").val();
 var job = $("#job").val();
 if (Number(password1) == Number(password2)){
 $.post("/register",{name:name,password:password1,job:job},function (res) {
 if (res ==true){
  alert("注册成功");
  window.location.href ="/login";
 } else {
  alert("注册失败，请检查数据重试");
 }
 })
 }else {
 alert("两次密码不一致！");
 }
 }
</script>
</html>

3.controller中代码

@Controller
public class TestController {
 @Resource
 private AdminDao ad;
 @Resource
 private UserDao ud;

 @RequestMapping("/login")//主页
 public String index(){
 return "login";
 }

 @RequestMapping("/goregister")//去注册页面
 public String goregister(){
 return "register";
 }
 @RequestMapping("/register")//注册
 @ResponseBody
 public boolean register(Admin admin){
 int i = ad.addAdmin(admin);
 if (i>0){
 return true;
 }else {
 return false;
 }
 }

 @RequestMapping("/gologin")//登录获取用户信息存到seccion
 public String gologin(Admin admin,HttpServletRequest request,Model model){
 Admin aa = ad.login(admin);
 if (aa==null){
 return "public/false";
 }
 HttpSession session = request.getSession();
 session.setAttribute("aname",admin.getName());
 session.setAttribute("apassword",admin.getPassword());
 List<UserInfo> userlist = ud.findall();
 model.addAttribute("admin",aa);
 model.addAttribute("alist",userlist);
 return "user/index";
 }

 @RequestMapping("/index")//从其他页面操作后返回列表页面（重复登录）
 public String login(Admin admin,Model model,HttpServletRequest request){
 HttpSession session = request.getSession();
 admin.setName((String) session.getAttribute("aname"));
 admin.setPassword((Integer) session.getAttribute("apassword"));
 Admin aa = ad.login(admin);
 List<UserInfo> userlist = ud.findall();
 model.addAttribute("admin",aa);
 model.addAttribute("alist",userlist);
 return "user/index";
 }
}

4.3user文件夹下新建index,addUser,updateUser页面，作为主页，添加，修改页面

1.index.html

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
 <meta charset="UTF-8">
 <title>首页</title>
 <style>a{text-decoration:none}</style>
 <script th:src="@{/js/jquery-1.8.0.min.js}"></script>
</head>
<body>
欢迎你 ：<input th:value="${admin.name}" style="border: none; outline: none"/><br><br><br><br>
<h2>人员信息维护</h2>
<table width="888" border="1">
 <thead>
 <tr>
 <th>id</th>
 <th>姓名</th>
 <th>年龄</th>
 <th>性别</th>
 <th>操作</th>
 </tr>
 <tr th:each="user:${alist}">
 <td align="center" th:text="${user.id}"></td>
 <td align="center" th:text="${user.name}"></td>
 <td align="center" th:text="${user.age}"></td>
 <td align="center" th:text="${user.sex}"></td>
 <td align="center"><a th:href="@{'/goupdate/'+${user.id}}" rel="external nofollow" >修改</a>
  <a th:href="@{'/godel/'+${user.id}}" rel="external nofollow" >删除</a>
 </td>
 </tr>
 </thead>
</table>
<button><a href="/goadd" rel="external nofollow" >添加</a></button>
</body>
</html>

2.addUser.html

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
 <meta charset="UTF-8">
 <title>添加用户</title>
 <script th:src="@{/js/jquery-1.8.0.min.js}"></script>
</head>
<body>
<h2>我是添加页面</h2>

请输入姓名：<input id="name" name="name" type="text" /><br><br>
请输入年龄：<input id="age" name="age" type="text" /><br><br>
请选择性别：<select id="sex" name="sex" style="width: 173px">
 <option value="男">男</option>
 <option value="女">女</option>
 </select><br><br>
<button onclick="goadd()" name="sub" id="sub">添加</button>
<button name="button" onclick="javascript:history.back(-1);">返回</button>
</body>
<script>
 function goadd() {
 var name = $("#name").val();
 var age = $("#age").val();
 var sex = $("#sex").val();
 $.post("/addUser",{name:name,age:age,sex:sex},function (res) {
 if (res==true){
 alert("添加成功")
 window.location.href ="/index";
 }else {
 alert("添加失败，请检查数据重试！");
 }
 })
 }
</script>
</html>

3.updateUser.html

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
 <meta charset="UTF-8">
 <title>修改用户</title>
 <script th:src="@{/js/jquery-1.8.0.min.js}"></script>
</head>
<body>
<h2>这是修改页面</h2>
<input type="hidden" id="id" th:value="${user.id}"><br><br>
请输入姓名：<input id="name" th:value="${user.name}"/><br><br>
请输入年龄：<input id="age" th:value="${user.age}"/><br><br>
请选择性别：<select id="sex" style="width: 173px">
 <option value="男">男</option>
 <option value="女">女</option>
 </select><br><br>
<button onclick="goupdate()">修改</button>
<button name="button" onclick="javascript:history.back(-1);">返回</button>
</body>
<script>
 function goupdate() {
 var id=$("#id").val();
 var name = $("#name").val();
 var age = $("#age").val();
 var sex = $("#sex").val();
 $.post("/update",{id:id,name:name,age:age,sex:sex},function (res) {
 if (res==true) {
 alert("修改成功");
 window.location.href="/index" rel="external nofollow" rel="external nofollow" ;
 }else {
 alert("修改失败，请检查数据重试！");
 }
 })
 }
</script>
</html>

4.controller中代码

@RequestMapping("/goadd")//去添加页面
public String goadd(){
 return "user/addUser";
}
@RequestMapping("/addUser")//添加信息
@ResponseBody
public boolean addUser(UserInfo user){
 int i = ud.adduser(user);
 if (i>0){
 return true;
 }else {
 return false;
 }
}
@RequestMapping("/goupdate/{id}")//去修改页面，回显数据
public String goupdate(@PathVariable("id") int id,Model model){
 UserInfo user = ud.findByid(id);
 model.addAttribute("user",user);
 return "user/updateUser";
}
@RequestMapping("/update")//修改
@ResponseBody
public boolean updateUser(UserInfo user){
 int i = ud.updateUser(user);
 if (i>0){
 return true;
 }else {
 return false;
 }
}
@RequestMapping("/godel/{id}")//删除
public String delUser(@PathVariable("id") Integer id){
 ud.delUser(id);
 return "public/success";
}

5.完整controller代码

package com.jz.table.controller;
import com.jz.table.dao.AdminDao;
import com.jz.table.dao.UserDao;
import com.jz.table.entity.Admin;
import com.jz.table.entity.UserInfo;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import java.util.List;

@Controller
public class TestController {
 @Resource
 private AdminDao ad;
 @Resource
 private UserDao ud;

 @RequestMapping("/login")//主页
 public String index(){
 return "login";
 }

 @RequestMapping("/goregister")//去注册页面
 public String goregister(){
 return "register";
 }
 @RequestMapping("/register")//注册
 @ResponseBody
 public boolean register(Admin admin){
 int i = ad.addAdmin(admin);
 if (i>0){
 return true;
 }else {
 return false;
 }
 }

 @RequestMapping("/gologin")//登录获取用户信息存到seccion
 public String gologin(Admin admin,HttpServletRequest request,Model model){
 Admin aa = ad.login(admin);
 if (aa==null){
 return "public/false";
 }
 HttpSession session = request.getSession();
 session.setAttribute("aname",admin.getName());
 session.setAttribute("apassword",admin.getPassword());
 List<UserInfo> userlist = ud.findall();
 model.addAttribute("admin",aa);
 model.addAttribute("alist",userlist);
 return "user/index";
 }

 @RequestMapping("/index")//从其他页面操作后返回列表页面（重复登录）
 public String login(Admin admin,Model model,HttpServletRequest request){
 HttpSession session = request.getSession();
 admin.setName((String) session.getAttribute("aname"));
 admin.setPassword((Integer) session.getAttribute("apassword"));
 Admin aa = ad.login(admin);
 List<UserInfo> userlist = ud.findall();
 model.addAttribute("admin",aa);
 model.addAttribute("alist",userlist);
 return "user/index";
 }

 @RequestMapping("/goadd")//去添加页面
 public String goadd(){
 return "user/addUser";
 }
 @RequestMapping("/addUser")//添加信息
 @ResponseBody
 public boolean addUser(UserInfo user){
 int i = ud.adduser(user);
 if (i>0){
 return true;
 }else {
 return false;
 }
 }
 @RequestMapping("/goupdate/{id}")//去修改页面，回显数据
 public String goupdate(@PathVariable("id") int id,Model model){
 UserInfo user = ud.findByid(id);
 model.addAttribute("user",user);
 return "user/updateUser";
 }
 @RequestMapping("/update")//修改
 @ResponseBody
 public boolean updateUser(UserInfo user){
 int i = ud.updateUser(user);
 if (i>0){
 return true;
 }else {
 return false;
 }
 }
 @RequestMapping("/godel/{id}")//删除
 public String delUser(@PathVariable("id") Integer id){
 ud.delUser(id);
 return "public/success";
 }

}

效果如图

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