Spring boot+mybatis+thymeleaf 实现登录注册，增删改查

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"> 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;
             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"> &nbsp;<button> <a href="/goregister">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=" 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/'+${user.id}}">修改</a>
                              <a th:href="@{'/godel/'+${user.id}}">删除</a>
        </td>
    </tr>
    </thead>
</table>
<button><a href="/goadd">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=" 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="${user.age}"/><br><br>
请选择性别：<select id="sex" style=" 173px">
            <option value="男">男</option>
            <option value="女">女</option>
            </select><br><br>
<button onclick="goupdate()">修改</button>&nbsp;
<button  name="button"  onclick="javascript:history.back(-1);">返回</button>
</body>
<script>
    function goupdate() {
        var id=$("#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";
            }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