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

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; @Servicepublic 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 */@RestControllerAdvicepublic class GlobalExceptionHandler { /** * 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"); } }

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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