Springboot统一返回格式

1、定义返回标准格式

一个标准的返回格式至少包含3部分：

1. status 状态值：由后端统一定义各种返回结果的状态码

2. message 描述：本次接口调用的结果描述

3. data 数据：本次返回的数据。

   package com.online.analyze.comm.util;
   
   import lombok.AllArgsConstructor;
   import lombok.Data;
   import lombok.NoArgsConstructor;
   
   import java.io.Serializable;
   
   @Data
   @NoArgsConstructor
   @AllArgsConstructor
   public class ResultData implements Serializable {
       public static final Integer SUCCESS_CODE = 0;
       public static final Integer FAILURE_CODE = -1;
       public static final Integer ERROR_CODE = 9999;
       public static final Integer DEALING = 2222;
   
       public static final String DEALING_MSG = "处理中";
       public static final String SUCCESS_MSG = "成功";
       public static final String FAILURE_MSG = "失败";
       public static final String ERROR_MSG = "系统异常";
   
       private Integer code;
       private String msg;
       protected T data;
   
       public static  ResultData success(){
           return new ResultData(SUCCESS_CODE,SUCCESS_MSG,null);
       }
       public static  ResultData success(String msg,T t){
           return new ResultData(SUCCESS_CODE,msg,t);
       }
       public static  ResultData success(T t){
           return new ResultData(SUCCESS_CODE,SUCCESS_MSG,t);
       }
   
       public static  ResultData fail(){
           return new ResultData(FAILURE_CODE,FAILURE_MSG,null);
       }
       public static  ResultData fail(T t){
           return new ResultData(FAILURE_CODE,FAILURE_MSG,t);
       }
       public static  ResultData fail(String msg,T t){
           return new ResultData(FAILURE_CODE,msg,t);
       }
       public static  ResultData fail(Integer code,String msg,T t){
           return new ResultData(code,msg,t);
       }
       public static  ResultData fail(String msg){
           return new ResultData(FAILURE_CODE,msg,null);
       }
       public static  ResultData error(){
           return  new ResultData<>(ERROR_CODE,ERROR_MSG,null);
       }
   
       public static  ResultData error(String msg){
           return  new ResultData<>(ERROR_CODE,msg,null);
       }
   
       public static  ResultData dealing(){
           return new ResultData<>(DEALING,DEALING_MSG,null);
       }
       public static  ResultData dealing(String msg){
           return new ResultData<>(DEALING,msg,null);
       }
       public static  ResultData dealing(String msg,T t){
           return new ResultData<>(DEALING,msg,t);
       }
       public static  ResultData dealing(T t){
           return new ResultData<>(DEALING,DEALING_MSG,t);
       }
   
   }
   

   接口统一返回

   return ResultData.success("msg",data);

2、借助SpringBoot提供的ResponseBodyAdvice,统一处理controller返回值，不要每个接口都手工制定ResultData返回值
 

“

ResponseBodyAdvice的作用：拦截Controller方法的返回值，统一处理返回值/响应体，一般用来统一返回格式，加解密，签名等等。
” 

public interface ResponseBodyAdvice {
  /**
  * 是否支持advice功能
  * true 支持，false 不支持
  */
    boolean supports(MethodParameter var1, Class> var2);
 
   /**
  * 对返回的数据进行处理
  */
    @Nullable
    T beforeBodyWrite(@Nullable T var1, MethodParameter var2, MediaType var3, Class> var4, ServerHttpRequest var5, ServerHttpResponse var6);
}

    //实现类处理
    //@RestControllerAdvice是@RestController注解的增强，可以实现三个方面的功能：

    //全局异常处理

    //全局数据绑定

    //全局数据预处理
@RestControllerAdvice
public class ResponseAdvice implements ResponseBodyAdvice