自定义统一的响应处理实体

spring自带的有结果响应对象，但有时候我们需要自定义响应结果的实体，所以这里记录自己编写响应实体的过程

/**
 * @Description: 响应码枚举，参考HTTP状态码的语义
 * @author
 * @date 2018/4/19 09:42
 */
public enum RetCode {
 
   // 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;
 
   RetCode(int code) {
      this.code = code;
   }
}

public class RetResult<T> {
 
   public int code;
 
   private String msg;
 
   private T data;
 
   public RetResult<T> setCode(RetCode retCode) {
      this.code = retCode.code;
      return this;
   }
 
   public int getCode() {
      return code;
   }
 
   public RetResult<T> setCode(int code) {
      this.code = code;
      return this;
   }
 
   public String getMsg() {
      return msg;
   }
 
   public RetResult<T> setMsg(String msg) {
      this.msg = msg;
      return this;
   }
 
   public T getData() {
      return data;
   }
 
   public RetResult<T> setData(T data) {
      this.data = data;
      return this;
   }
 
}

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

@RequestMapping("/selectById")
public RetResult<UserInfo> selectById(Integer id){
    UserInfo userInfo = userInfoService.selectById(id);
    return RetResponse.makeOKRsp(userInfo);
}