在springboot用@Controller @ResponseBody@Autowired @PostMapping@Service@Mapper@Data实现用户登录案例

好的，下面是一个基于 Spring Boot 的用户登录案例：

1. 创建 User 实体类

@Data
public class User {
    private String username;
    private String password;
}

2. 创建 UserService 接口和实现类

public interface UserService {
    User login(String username, String password);
}

@Service
public class UserServiceImpl implements UserService {

    @Override
    public User login(String username, String password) {
        // 在这里校验用户名和密码是否正确，省略实现
        return new User(username, password);
    }
}

3. 创建 UserController 控制器

@Controller
public class UserController {

    @Autowired
    private UserService userService;

    @PostMapping("/login")
    @ResponseBody
    public String login(@RequestBody User user) {
        User loginUser = userService.login(user.getUsername(), user.getPassword());
        if (loginUser != null) {
            return "登录成功";
        } else {
            return "用户名或密码错误";
        }
    }
}

4. 配置 mybatis 和数据库信息

在 application.properties 文件中添加以下配置：

spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=UTF-8&autoReconnect=true&failOverReadOnly=false&maxReconnects=10
spring.datasource.username=root
spring.datasource.password=root
mybatis.mapper-locations=classpath:mapper/*.xml

5. 创建 UserMapper 接口和 XML 映射文件

@Mapper
public interface UserMapper {
    User selectByUsernameAndPassword(@Param("username") String username, @Param("password") String password);
}

在 mapper 文件夹下创建 UserMapper.xml 文件，编写 SQL 语句：

<mapper namespace="com.example.demo.mapper.UserMapper">

    <resultMap id="BaseResultMap" type="com.example.demo.entity.User">
        <id column="username" property="username" />
        <result column="password" property="password" />
    </resultMap>

    <select id="selectByUsernameAndPassword" resultMap="BaseResultMap">
        select * from user where username=#{username} and password=#{password}
    </select>

</mapper>

6. 编写测试代码

@RunWith(SpringRunner.class)
@SpringBootTest
public class UserControllerTests {

    @Autowired
    private UserController userController;

    @Test
    public void testLogin() {
        User user = new User();
        user.setUsername("admin");
        user.setPassword("123456");
        String result = userController.login(user);
        assertEquals("登录成功", result);
    }
}

以上就是一个基于 Spring Boot 的用户登录案例的实现过程，希望对你有所帮助。