Spring Boot 捕捉全局异常 统一返回值Curtain的博客-

 在前后端分离的情况下，我们经常会定义一个统一的反回数据格式，通常都会包含状态码，返回信息，返回的数据，是否成功等参数。

1、ResultCode

  单独定义了一个ReturnCode枚举类用于存储代码和返回的Message

 public enum ResultCode {     //成功     SUCCESS(200),     // 失败     FAIL(400),      // 未认证（签名错误）     UNAUTHORIZED(401),      // 接口不存在     NOT_FOUND(404),      // 服务器内部错误     INTERNAL_SERVER_ERROR(500);     public int code;     ResultCode(int code)     {         this.code=code;     } }

2、ResponseResult

  /*  统一返回信息  */ public class ResponseResult<T> {     public int code; //返回状态码200成功      private String msg; //返回描述信息      private T data; //返回内容体      public ResponseResult<T> setCode(ResultCode retCode) {         this.code = retCode.code;         return this;     }      public int getCode() {         return code;     }      public ResponseResult<T> setCode(int code) {         this.code = code;         return this;     }      public String getMsg() {         return msg;     }      public ResponseResult<T> setMsg(String msg) {         this.msg = msg;         return this;     }      public T getData() {         return data;     }      public ResponseResult<T> setData(T data) {         this.data = data;         return this;     }  } 

在定义一个统一返回类：

3、Response

 public class Response {     private final static String SUCCESS = "success";      private final static String FAIL = "fail";      public static <T> ResponseResult<T> makeOKRsp() {         return new ResponseResult<T>().setCode(ResultCode.SUCCESS).setMsg(SUCCESS);     }      public static <T> ResponseResult<T> makeOKRsp(String message) {         return new ResponseResult<T>().setCode(ResultCode.SUCCESS).setMsg(message);     }      public static <T> ResponseResult<T> makeOKRsp(T data) {         return new ResponseResult<T>().setCode(ResultCode.SUCCESS).setMsg(SUCCESS).setData(data);     }      public static <T> ResponseResult<T> makeErrRsp(String message) {         return new ResponseResult<T>().setCode(ResultCode.INTERNAL_SERVER_ERROR).setMsg(message);     }      public static <T> ResponseResult<T> makeRsp(int code, String msg) {         return new ResponseResult<T>().setCode(code).setMsg(msg);     }      public static <T> ResponseResult<T> makeRsp(int code, String msg, T data) {         return new ResponseResult<T>().setCode(code).setMsg(msg).setData(data);     } }

4、新建 IUserService

新建测试用户接口类

 package com.example.demo.service; import com.example.demo.entity.User; public interface IUserService {     public User getUserInfo(); }

5、新建 UserServiceImpl

新建测试用户信息服务类

 package com.example.demo.service.impl; import com.example.demo.entity.User; import com.example.demo.service.UserService; import org.springframework.stereotype.Service;  import java.io.File; import java.text.SimpleDateFormat; import java.util.Date; import java.util.logging.SimpleFormatter;  @Service public class UserServiceImpl implements IUserService {     public User getUserInfo(){         User user = new User();         user.setName("jack");         user.setPassword(12341234);          return user;     }  }

6、在controller调用

  @Autowired     UserService service;     @RequestMapping(value = "/getUserItem",method = RequestMethod.GET)     public ResponseResult<User> getUserItem(){         try {             User user = service.getUserInfo();             String[] arr= new String[]{"测试"};             return  Response.makeOKRsp(user);         }catch (Exception e)         {             return  Response.makeErrRsp("查询用户信息异常");         }     }

返回结果：

7、全局异常处理器 

 /**  * 全局异常处理  */ @RestControllerAdvice public class GlobalExceptionHandler {      /*============= 请求错误 start ==============================================*/      /**      * HTTP 请求方式不支持异常      * HttpRequestMethodNotSupportedException      * @return {@link ResponseResult}      */     @ExceptionHandler(value = HttpRequestMethodNotSupportedException.class)     public ResponseResult httpRequestMethodNotSupportException(HttpRequestMethodNotSupportedException e, HttpServletRequest request) {         return Response.makeErrRsp("请求方式不支持异常");     }      /*============= 请求错误 end ==============================================*/  }

 修改一下getUserItem让其抛出自定义查询返回null的异常：