统一返回包装类

package com.example.common;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

@Data
@AllArgsConstructor
@NoArgsConstructor
public class CommonResult<T>{
    private String code;
    private String msg;
    private T data;

    public static CommonResult success(){
        CommonResult result=new CommonResult();
        result.setCode("200");
        result.setMsg("成功");
        return result;
    }

    public static <T> CommonResult<T> success(T data){
        CommonResult<T> result=new CommonResult<T>();
        result.setData(data);
        result.setCode("200");
        result.setMsg("成功");
        return result;
    }

    public static<T> CommonResult<T> error(String code,String msg){
        CommonResult <T> result=new CommonResult<T>();
        result.setCode(code);
        result.setMsg(msg);
        return result;
    }
}

package com.example.common;

public interface Constants {

    String CODE_200 = "200"; //成功
    String CODE_401 = "401";  // 权限不足
    String CODE_400 = "400";  // 参数错误
    String CODE_500= "500"; // 系统错误
    String CODE_600 = "600"; // 其他业务异常

}

``