SpringBoot 中统一响应格式，你应该这样做

> 在我们开发SpringBoot后端服务时，一般需要给前端统一响应格式，方便前端调试及配置错误提示等等。这篇文章讲讲实际工作中统一响应格式是如何做的。

### 一、统一响应基础类

在项目中对应工具类或Vo层来创建我们的统一响应类


`ResponseResult`: 

```java
import com.fasterxml.jackson.annotation.JsonInclude;
import com.zhang.enums.AppHttpCodeEnum;

import java.io.Serializable;

@JsonInclude(JsonInclude.Include.NON_NULL)
public class ResponseResult<T> implements Serializable {
    private Integer code;
    private String msg;
    private T data;

    public ResponseResult() {
        this.code = AppHttpCodeEnum.SUCCESS.getCode();
        this.msg = AppHttpCodeEnum.SUCCESS.getMsg();
    }

    public ResponseResult(Integer code, T data) {
        this.code = code;
        this.data = data;
    }

    public ResponseResult(Integer code, String msg, T data) {
        this.code = code;
        this.msg = msg;
        this.data = data;
    }

    public ResponseResult(Integer code, String msg) {
        this.code = code;
        this.msg = msg;
    }

    public static ResponseResult errorResult(int code, String msg) {
        ResponseResult result = new ResponseResult();
        return result.error(code, msg);
    }

    public static ResponseResult okResult() {
        ResponseResult result = new ResponseResult();
        return result;
    }

    public static ResponseResult okResult(int code, String msg) {
        ResponseResult result = new ResponseResult();
        return result.ok(code, null, msg);
    }

    public static ResponseResult okResult(Object data) {
        ResponseResult result = setAppHttpCodeEnum(AppHttpCodeEnum.SUCCESS, AppHttpCodeEnum.SUCCESS.getMsg());
        if (data != null) {
            result.setData(data);
        }
        return result;
    }

    public static ResponseResult errorResult(AppHttpCodeEnum enums) {
        return setAppHttpCodeEnum(enums, enums.getMsg());
    }

    public static ResponseResult errorResult(AppHttpCodeEnum enums, String msg) {
        return setAppHttpCodeEnum(enums, msg);
    }

    public static ResponseResult setAppHttpCodeEnum(AppHttpCodeEnum enums) {
        return okResult(enums.getCode(), enums.getMsg());
    }

    private static ResponseResult setAppHttpCodeEnum(AppHttpCodeEnum enums, String msg) {
        return okResult(enums.getCode(), msg);
    }

    public ResponseResult<?> error(Integer code, String msg) {
        this.code = code;
        this.msg = msg;
        return this;
    }

    public ResponseResult<?> ok(Integer code, T data) {
        this.code = code;
        this.data = data;
        return this;
    }

    public ResponseResult<?> ok(Integer code, T data, String msg) {
        this.code = code;
        this.data = data;
        this.msg = msg;
        return this;
    }

    public ResponseResult<?> ok(T data) {
        this.data = data;
        return this;
    }

    public Integer getCode() {
        return code;
    }

    public void setCode(Integer code) {
        this.code = code;
    }

    public String getMsg() {
        return msg;
    }

    public void setMsg(String msg) {
        this.msg = msg;
    }

    public T getData() {
        return data;
    }

    public void setData(T data) {
        this.data = data;
    }
}
```

里面还有用到一个响应的枚举类`AppHttpCodeEnum`，接下来我们创建这个枚举类

### 二、响应枚举类


`AppHttpCodeEnum`:

```java
public enum AppHttpCodeEnum {
    // 成功
    SUCCESS(200, "操作成功"),
    // 登录
    NEED_LOGIN(401, "需要登录后操作"),
    NO_OPERATOR_AUTH(403, "无权限操作"),
    SYSTEM_ERROR(500, "出现错误"),
    USERNAME_EXIST(501, "用户名已存在"),
    PHONENUMBER_EXIST(502, "手机号已存在"), EMAIL_EXIST(503, "邮箱已存在"),
    REQUIRE_USERNAME(504, "必需填写用户名"),
    CONTENT_NOT_NULL(506, "评论内容不能为空"),
    FILE_TYPE_ERROR(507, "文件类型错误"),
    USERNAME_NOT_NULL(508, "用户名不能为空"),
    NICKNAME_NOT_NULL(509, "昵称不能为空"),
    PASSWORD_NOT_NULL(510, "密码不能为空"),
    EMAIL_NOT_NULL(511, "邮箱不能为空"),
    NICKNAME_EXIST(512, "昵称已存在"),
    LOGIN_ERROR(505, "用户名或密码错误");
    int code;
    String msg;

    AppHttpCodeEnum(int code, String errorMessage) {
        this.code = code;
        this.msg = errorMessage;
    }

    public int getCode() {
        return code;
    }

    public String getMsg() {
        return msg;
    }
}
```

一般我们在这个枚举类中管理需要响应的错误`code`及`msg`

### 三、使用

在对应的controller或者service里面使用统一响应类


- 成功: `ResponseResult.okResult()`
- 失败: `ResponseResult.errorResult(AppHttpCodeEnum.SYSTEM_ERROR)`, 参数传入我们定义的`响应枚举类`

> SpringBoot中统一响应格式就是如此简单，如果大家有什么疑问，可以评论区留言哈，拜托大家`点赞收藏`一下， 🙏 🙏，后续还会继续出关于SpringBoot相关的系列文章哦，记得关注!