SpringBoot teaching material 6-SpringBoot login and registration function implementation (with a simple front end)

Item style:

SQL:

CREATE TABLE `t_user` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `username` varchar(32) NOT NULL,
  `password` varchar(32) NOT NULL,
  PRIMARY KEY (`id`),
  UNIQUE KEY `username` (`username`)
) ENGINE=InnoDB AUTO_INCREMENT=5 DEFAULT CHARSET=utf8

Project structure:

pom.xml:

<?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 https://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>2.7.13</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.bai</groupId>
    <artifactId>login</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>login</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.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.3.1</version>
        </dependency>

        <dependency>
            <groupId>com.mysql</groupId>
            <artifactId>mysql-connector-j</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter-test</artifactId>
            <version>2.3.1</version>
            <scope>test</scope>
        </dependency>
    </dependencies>

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

</project>

application.properties:

# 数据库连接信息
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/companydb?serverTimezone=UTC
spring.datasource.username=root
spring.datasource.password=123456

# mapper映射
mybatis.type-aliases-package=com.bai.login.pojo
mybatis.mapper-locations=classpath:mapper/*.xml

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>login</title>
</head>
<body>
<form method="post" action="/user/login">
    用户名：<input name="username" type="text"><br>
    密码：<input name="password" type="password"><br>
    <input type="submit" value="登录验证">
    <input type="button" onclick="javascript:window.location.href='regist.html'" value="去注册页面">
</form>
</body>
</html>

regist.html:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<form action="/user/regist" method="post">
    用户名：<input type="text" name="username"><br>
    密码：<input type="password" name="password"><br>
    <input type="submit" value="注册验证"><br>
    <input type="button" onclick="javascript:window.location.href='login.html'" value="返回登录界面">
</form>
</body>
</html>

User.java:

package com.bai.login.pojo;

public class User {
    private Integer id;
    private String username;
    private String password;

    public Integer getId() {
        return id;
    }

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

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

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


}

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.bai.login.mapper.UserMapper">
    <select id="findAll" resultType="User">
        select * from t_user
    </select>
    <select id="findByName" resultType="User">
        select * from t_user where username = #{username}
    </select>
    <select id="findPswByName" resultType="String">
        select password from t_user where username = #{username}
    </select>
    <insert id="save">
        insert into t_user(username,password) value (#{username},#{password})
    </insert>
</mapper>

UserMapper.java:

package com.bai.login.mapper;

import com.bai.login.pojo.User;
import org.apache.ibatis.annotations.Mapper;

import java.util.List;

@Mapper
public interface UserMapper {
    List<User> findAll();
    User findByName(String name);
    String findPswByName(String UserName);
    void save(User user);
}

UserService.java:

package com.bai.login.service;

import com.bai.login.mapper.UserMapper;
import com.bai.login.pojo.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
public class UserService {
    @Autowired
    private UserMapper userMapper;
    public String login(User user){
        try {
            User userExistN=userMapper.findByName(user.getUsername());
            if (userExistN!=null){
                String userExistP=userMapper.findPswByName(user.getUsername());
                if (userExistP.equals(user.getPassword())){
                    return user.getUsername()+"用户登录成功，欢迎您！";
                }else {
                    return "登录失败，密码错误";
                }
            }else {
                return "登录失败，账户不存在";
            }
        } catch (Exception e) {
            e.printStackTrace();
            return e.getMessage();
        }
    }

    public String regist(User user){
        try {
            User userExist=userMapper.findByName(user.getUsername());
            if (user.getUsername().equals("")){
                return "账户名不能为空";
            }else if (user.getPassword().equals("")){
                return "密码不能为空";
            }else if (userExist!=null) {
                return "账户已经存在";
            }else {
                userMapper.save(user);
                return "注册成功";
            }
        } catch (Exception e) {
            e.printStackTrace();
            return e.getMessage();
        }
    }


    public List<User> findAll(){
        List<User> list=userMapper.findAll();
        return list;
    }



}

UserController.java：

package com.bai.login.controller;

import com.bai.login.pojo.User;
import com.bai.login.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

@RestController
@RequestMapping("/user")
public class UserController {
    @Autowired
    private UserService userService;

    @RequestMapping("/login")
    public String login(User user){
        return userService.login(user);
    }

    @RequestMapping("/regist")
    public String regist(User user){
        return userService.regist(user);
    }

    /**
     * 解决查询数据库中文出现乱码问题
     * @return
     */
    @RequestMapping(value = "/alluser",method = RequestMethod.GET,produces = "application/json;charset=UTF-8" )
    public List<User> findAll(){
        return userService.findAll();
    }


}

LoginApplication.java:

package com.bai.login;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class LoginApplication {

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

}

Access address: http://localhost:8080/login.html

SpringBoot teaching material 6-SpringBoot login and registration function implementation (with a simple front end)

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