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1.创建一个SpringBoot项目

2.导入依赖（SpringBoot，mybatis-plus，lambok）

3.配置yaml文件连接数据库

server:  port: 9091spring:  datasource:    username: root    password: 123456    url: jdbc:mysql://localhost:3306/panda?useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai    driver-class-name: com.mysql.cj.jdbc.Driver

4.创建实体类(Pojo) 

注意必须生成Getter和Setter或者添加注解@Data

@Data @NoArgsConstructor @AllArgsConstructorpublic class User {    @TableId(type = IdType.AUTO)    private Integer id;    private String username;    private String password;    private String nickname;    private String icon;    private String role;    private Integer state;}

 5.Mapper类

public interface UserMapper extends BaseMapper
   
     {}
   

 6.业务层以及实现类

public interface IUserService extends IService
   
     {    Result login(String username, String password);}
   

@Servicepublic class UserServiceImpl extends ServiceImpl
   
     implements IUserService { @Override    public Result login(String username, String password) {        // select * from admin where username = ?        User user = query().eq("username", username).one();        if (user == null) {            return Result.fail("用户名不存在");        }        if (!user.getPassword().equals(password)) {            return Result.fail("密码错误");        }        if (user.getState() == 1) {            return Result.fail("账号审核中");        }        if (user.getState() == 2) {            return Result.fail("账号审核失败");        }        user.setPassword(null);        // 方案2: 用户信息存到redis        String key = "user:" + UUID.randomUUID();        redisTemplate.opsForValue().set(key, user, 30, TimeUnit.MINUTES);        // 返回数据token  前端放到Header的X-Token中        return Result.ok(key);    }}
   

7.控制层类(Controller)

@RestController@RequestMapping("/user")public class UserController {    @Resource    private IUserService userService;    /**     * 通用登录接口     */    @PostMapping("/login")    public Result login(@RequestParam String username,                        @RequestParam String password) {        System.out.println(username + " " + password);        return userService.login(username, password);    }}

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