SpringBoot最为普通简单的统一返回数据格式，ResultVo，结果封装

1、ResultVo，把数据统一封装在 private T data 中

package com.xhblogs.book.utils;
import lombok.AllArgsConstructor;
import lombok.Data;

@Data //字段生成get和set方法
@AllArgsConstructor
public class ResultVo<T> {
    private String msg;
    private int code;
    private T data;
}

一般msg可以直接写（或者写一个常量类）

2、code状态码（常用的）

• 方式一

package com.xhblogs.book.utils;

/**
 * 返回状态码
 */
public class StatusCode {
    //返回成功
    public static final int SUCCESS_CODE = 200;
    //错误状态码
    public static final int ERROR_CODE = 500;
    //无权限
    public static final int NO_LOGIN = 600;
    public static final int NO_AUTH = 700;
}

• 方式二：状态枚举

package com.ppmall.common;

/**
 * response状态枚举
 * @author rex
 *
 */
public enum ResponseCode {
    SUCCESS(0,"SUCCESS"),
    ERROR(1,"ERROR"),
    NOT_LOGIN(10,"NOT_LOGIN"),
    TOKEN_EXPIRED(20,"TOKEN_EXPIRED"),
    TOKEN_ERROR(30,"TOKEN_ERROR"),
    TOKEN_INVALID(40,"TOKEN_INVALID"),
    ILLEGAL_ARGUMENT(2,"ILLEGAL_ARGUMENT");

    private int code;
    private String desc;
    ResponseCode(int code,String desc){
        this.code = code;
        this.desc = desc;

    }

    public int getCode(){
        return this.code;
    }
    public String getDesc(){
        return this.desc;
    }
}

3、数据返回工具类

package com.xhblogs.book.utils;


import com.xhblogs.book.utils.StatusCode;

/**
 * 数据返回工具类
 */
public class ResultUtils {
    /**
     * 无参数返回
     * @return
     */
    public static ResultVo succcess() {
        return Vo(null, StatusCode.SUCCESS_CODE, null);
    }
    public static ResultVo success(String msg){
        return Vo(msg,StatusCode.SUCCESS_CODE,null);
    }
    /**
     * 返回带参数
     * @param msg
     * @param data
     * @return
     */
    public static ResultVo success(String msg,Object data){
        return Vo(msg, StatusCode.SUCCESS_CODE,data);
    }
    public static ResultVo success(String msg,int code,Object data){
        return Vo(msg,code,data);
    }
    public static ResultVo Vo(String msg, int code, Object data) {
        return new ResultVo(msg, code, data);
    }

    /**
     * 错误返回
     * @return
     */
    public static ResultVo error(){
        return Vo(null,StatusCode.ERROR_CODE,null);
    }
    public static ResultVo error(String msg){
        return Vo(msg,StatusCode.ERROR_CODE,null);
    }
    public static ResultVo error(String msg,int code,Object data){
        return Vo(msg,code,data);
    }
    public static ResultVo error(String msg,int code){
        return Vo(msg,code,null);
    }
    public static ResultVo error(String msg,Object data){
        return Vo(msg, StatusCode.ERROR_CODE,data);
    }
}