在前后端分離的情況下，我們經常會定義一個統一的反回數據格式，通常都會包含狀態碼，返回信息，返回的數據，是否成功等參數。

1、ResultCode

 單獨定義了一個ReturnCode枚舉類用于存儲代碼和返回的Message

public enum ResultCode {

//成功

SUCCESS(200),

// 失敗

FAIL(400),

// 未認證（簽名錯誤）

UNAUTHORIZED(401),

// 接口不存在

NOT_FOUND(404),

// 服務器內部錯誤

INTERNAL_SERVER_ERROR(500);

public int code;

ResultCode(int code)

{

this.code=code;

}

}

2、ResponseResult

/*

統一返回信息

*/

public class ResponseResult<T> {

public int code; //返回狀態碼200成功

private String msg; //返回描述信息

private T data; //返回內容體

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;

}

}

在定義一個統一返回類：

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

新建測試用戶接口類

package com.example.demo.service;

import com.example.demo.entity.User;

public interface IUserService {

public User getUserInfo();

}

5、新建 UserServiceImpl

新建測試用戶信息服務類

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調用

@Autowired

UserService service;

@RequestMapping(value = "/getUserItem",method = RequestMethod.GET)

public ResponseResult<User> getUserItem(){

try {

User user = service.getUserInfo();

String[] arr= new String[]{"測試"};

return  Response.makeOKRsp(user);

}catch (Exception e)

{

return  Response.makeErrRsp("查詢用戶信息異常");

}

}

返回結果：

7、全局異常處理器 

/**

* 全局異常處理

*/

@RestControllerAdvice

public class GlobalExceptionHandler {

/*============= 請求錯誤 start ==============================================*/

/**

* HTTP 請求方式不支持異常

* HttpRequestMethodNotSupportedException

* @return {@link ResponseResult}

*/

@ExceptionHandler(value = HttpRequestMethodNotSupportedException.class)

public ResponseResult httpRequestMethodNotSupportException(HttpRequestMethodNotSupportedException e, HttpServletRequest request) {

return Response.makeErrRsp("請求方式不支持異常");

}

/*============= 請求錯誤 end ==============================================*/

}

 修改一下getUserItem讓其拋出自定義查詢返回null的異常：

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