4.springboot-异常处理

springboot-异常处理

1 创建一个响应类

​ 用于封装数据。

public class Msg<T> implements Serializable {
    private String status;
    private String message;
    private T data;

    public String getStatus() {
        return status;
    }

    public void setStatus(String status) {
        this.status = status;
    }

    public String getMessage() {
        return message;
    }

    public void setMessage(String message) {
        this.message = message;
    }

    public T getData() {
        return data;
    }

    public void setData(T data) {
        this.data = data;
    }

    public Msg() {
    }

    public Msg(String status, String message, T data) {
        this.status = status;
        this.message = message;
        this.data = data;
    }

    @Override
    public String toString() {
        return "Msg{" +
                "status='" + status + '\'' +
                ", message='" + message + '\'' +
                ", data=" + data +
                '}';
    }
}

2 创建一个异常类

public class LoginException extends RuntimeException{
    public LoginException() {
    }

    public LoginException(String message){
        super(message);
    }
}

3 创建一个异常处理类

@ControllerAdvice
public class MyExceptionHandler {

    @ExceptionHandler(LoginException.class)
    @ResponseBody
    public Msg<String> loginExceptionHandler(Exception e){
        System.out.println("出现了异常"+e.getMessage());
        return new Msg<>("400", "出现了异常", e.getMessage());
    }
}

4 创建controller

这里用到的person，大家可以自己创建。

@Controller
public class HelloController {
    @Autowired
    private Person person;

    @ResponseBody
    @GetMapping("/hello")
    public String hello(){
        System.out.println(person);
        return "hello,Spring Boot！";
    }

    @ResponseBody
    @GetMapping("/login")
    public Msg<Person> login(String username){
        System.out.println("开始进行登陆检测");
        if (!"admin".equals(username)){
            throw new LoginException("用户或者密码错误");
        }
        return new Msg<Person>("200", "登陆成功", person);
    }
}

5 访问测试