java返回数据增加状态码

如

 创建包common

package com.example.mybatis_plus_generator.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

    String DICT_TYPE_ICON = "icon";

}

package com.example.mybatis_plus_generator.common;

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

/**
 * 接口统一返回包装类
 */
@Data
@NoArgsConstructor
@AllArgsConstructor
public class Result {

    private String code;
    private String msg;
    private Object data;

    public static Result success() {
        return new Result(Constants.CODE_200, "", null);
    }

    public static Result success(Object data) {
        return new Result(Constants.CODE_200, "", data);
    }

    public static Result error(String code, String msg) {
        return new Result(code, msg, null);
    }

    public static Result error() {
        return new Result(Constants.CODE_500, "系统错误", null);
    }

}

在controller中的使用如下：

    @GetMapping("/findAll")
    public Result findAll(){
        return Result.success(userService.list());
    }