Spring Boot 捕捉全局异常 统一返回值的问题

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：

总结

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