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登入注册模块设计

创建User类

我们先创建一个model包用来保存实体类

在其下创建User类!

package com.example.onlinemusic.model;
import lombok.Data;

/**
 * Created with IntelliJ IDEA.
 * Description:
 * User: hold on
 * Date: 2022-07-26
 * Time: 13:37
 */
@Data //Data注解生成了setter/getter/tostring方法
public class User {
    private int id;
    private String username;
    private String password;
}

创建对应的Mapper和Controller

创建UserMapper接口

创建Mapper包保存Mapper接口!

//UserMapper
package com.example.onlinemusic.mapper;

import com.example.onlinemusic.model.User;
import org.apache.ibatis.annotations.Mapper;

/**
 * Created with IntelliJ IDEA.
 * Description:
 * User: hold on
 * Date: 2022-07-26
 * Time: 13:38
 */
@Mapper //实现xml映射,无需通过其他的mapper映射文件!
public interface UserMapper {
    //登入功能!
    User login(User loginUser);
}

创建UserMapper.xml

在resource包下创建mybatis包用于保存mapper.xml文件,再创建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.example.onlinemusic.mapper.UserMapper">
    <select id="login" resultType="com.example.onlinemusic.model.User">
select * from user where username=#{username} and password=#{password}
</select>
</mapper>

实现登入

设置登入的请求和响应

请求

请求:
{ 
    post, //请求方法
    /user/login //请求的url
    data:{username,password} //传输的数据!
}

响应

响应:
{
    "status":0, //status 为0表示登入成功,为负数表示登入失败!
    "message":"登入成功", // 放回登入信息!
    "data":{  // 登入成功后获取到相应的用户信息!
        "id":xxxx,
        "username":xxxx,
        "password":xxxx
    }
}

创建UserController类

创建一个controller包,在其包下创建一个UserController类

package com.example.onlinemusic.controller;

import com.example.onlinemusic.mapper.UserMapper;
import com.example.onlinemusic.model.User;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;

import javax.annotation.Resource;

/**
 * Created with IntelliJ IDEA.
 * Description:
 * User: hold on
 * Date: 2022-07-26
 * Time: 15:12
 */
@RestController // @ResponseBody + @Controller
@RequestMapping("/user") //设置路由 用来映射请求!
public class UserController {
    //将UserMapper注入!
    @Resource
    private UserMapper userMapper;

    @RequestMapping("/login")
    public void login(@RequestParam String username,@RequestParam String password){
        User userLogin = new User();
        userLogin.setUsername(username);
        userLogin.setPassword(password);

        User user = userMapper.login(userLogin);
        //先初步测试一下,后面再完善
        if(user!=null){//登入成功!
            System.out.println("登入成功!");
        }else{
            System.out.println("登入失败!");
        }
    }
}