springboot3项目的搭建三（统一返回异常等）

springboot3项目的搭建三（统一返回异常等）

 一、统一返回 （其实两部分，一个是返回错误码可枚举可类，另一个是返回的实体其中data是泛型）

1.返回码：

package com.qiqi.common.constants;

public enum ReturnCode {

    SUCCESS(200, "操作成功"),
    NEED_LOGIN(401, "需要登录后操作"),
    NO_OPERATOR_AUTH(403, "无权限操作"),
    TOKEN_ILL(404,"token非法"),
    SYSTEM_ERROR(500, "出现错误"),
    USERNAME_EXIST(501, "用户名已经存在"),
    PHOMENUMBER_EXIST(502, "手机号已存在"),
    EMAIL_EXIST(503, "邮箱已存在"),
    REQUEST_USERNAME(504, "必须填写用户名"),
    LOGIN_ERROR(505, "用户名或密码错误");

    // 自定义状态码
    private final int code;

    // 自定义描述
    private final String msg;

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

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

    public String getMsg() {
        return this.msg;
    }

}

2.返回实体

package com.qiqi.common.response;

import com.qiqi.common.constants.ReturnCode;
import lombok.Data;

import java.util.Objects;

@Data
public class ResultData<T> {
    /**
     * 响应编码
     */
    private Integer code;
    /**
     * 响应信息
     */
    private String msg;
    /**
     * 响应数据
     */
    private T data;
    /**
     * 接口请求时间
     */
    private long timestamp ;

    public ResultData(){
        this.timestamp = System.currentTimeMillis();
    }

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

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

    public static ResultData success(){
        return ResultData.success(ReturnCode.SUCCESS.getCode(),ReturnCode.SUCCESS.getMsg());
    }
    public static ResultData success(int code, String msg){
        ResultData<Object> resultData = new ResultData<>();
        resultData.setCode(code);
        resultData.setMsg(msg);
        return resultData;
    }

    public static ResultData success(Object data){
        ResultData<Object> resultData = new ResultData<>(ReturnCode.SUCCESS.getCode(),ReturnCode.SUCCESS.getMsg());
        if (Objects.nonNull(data)){
            resultData.setData(data);
        }
        return resultData;
    }

    public static ResultData error(int code, String msg){
        ResultData<Object> resultData = new ResultData<>(code,msg);
        return resultData;
    }

    public static ResultData error(ReturnCode returnCode){
        ResultData<Object> resultData = new ResultData<>(returnCode.getCode(), returnCode.getMsg());
        return resultData;
    }
}

3. 使用

        //return ResultData.success(admins); //返回实体
        return ResultData.error(ReturnCode.EMAIL_EXIST);//返回 邮箱已存在

二、异常处理