java统一返回util

java统一返回结果

1. 格式如下

   {
       "code": 200,
       "message": "登录成功",
       "data": true
   }
   

2. 创建返回结果类

   package com.hi.utils.result;
   
   import lombok.Data;
   import lombok.experimental.Accessors;
   
   
   @Data
   @Accessors(chain = true)
   public class CodeMsg {
   
       public Integer code;
       public String message;
   
       
       public static CodeMsg SUCCESS = new CodeMsg(200,"SUCCESS");
       public static CodeMsg SERVER_ERROR = new CodeMsg(100,"系统异常：%s");
       public static CodeMsg BIND_ERROR = new CodeMsg(101,"(绑定异常)参数校验异常：%s"); 
       public static CodeMsg SESSION_ERROR = new CodeMsg(102,"没有SESSION！"); 
       public static CodeMsg REQUEST_ERROR = new CodeMsg(103,"非法请求！"); 
       public static CodeMsg REQUEST_OVER_LIMIT = new CodeMsg(104,"请求次数过多！"); 
   //    public static CodeMsg aa = new CodeMsg(104,?); 
   
       public CodeMsg() {
       }
   
       public CodeMsg(Integer code, String msg ) {
           this.code = code;
           this.message = msg;
       }
       //不定参的构造函数
       public CodeMsg fillArgs(Object... args) {
           int code = this.code;
           String message = String.format(this.message, args);
           return new CodeMsg(code, message);
       }
   
   }
   

   package com.hi.utils.result;
   
   import lombok.Data;
   import lombok.experimental.Accessors;
   
   
   @Data
   @Accessors(chain = true)
   public class Result {
   
       private int code;// 业务自定义状态码
   
       private String message;// 请求状态描述，调试用
   
       private T data;// 请求数据，对象或数组均可
   
       public Result() {
       }
   
       
       public static  Result success(T data){
           return new Result(data);
       }
   
       
       public static  Result error(CodeMsg msg){
           return new Result(msg);
       }
   
       public static  Result error(T data){
           return new Result(data);
       }
   
       public static  Result error(Integer code,String message){
           return new Result(new CodeMsg(code,message));
       }
   
       
       public Result(T data){
           this.code = 200;//默认200是成功
           this.message = "SUCCESS";
           this.data = data;
       }
   
       public Result(int code, String msg) {
           this.code = code;
           this.message = msg;
       }
   
       
       private Result(CodeMsg msg) {
           if(msg != null) {
               this.code = msg.getCode();
               this.message = msg.getMessage();
           }
       }
   
   }
   

3. controller层调用

   @PostMapping("/userLogin")
   public Result login(@RequestBody LoginUserVo loginUserVo){
       System.err.println(loginUserVo);
       boolean b = userService.userLogin(loginUserVo.getUsername(), loginUserVo.getPassword());
       if (b){
           return Result.success(b).setMessage("登录成功");
       }
       return Result.error(new CodeMsg(401,"登录失败"));
   }
   

   返回值Result最好写上返回类型，这样在swagger里面就可以显示对象属性注释