java优雅的进行异常处理

不说废话，直接开怼（如果不知道@data和@Getter等注解可以了解下lombok，装个插件，爽得一逼）

1.定义一个异常的枚举类

package cn.carryshuai.自定义异常处理.enums;

import lombok.AllArgsConstructor;
import lombok.Getter;
import lombok.NoArgsConstructor;

@Getter
@NoArgsConstructor
@AllArgsConstructor
public enum ExceptionEnum {

    PRICE_CANNOT_BE_NULL(400, "价格不能为空"),
    PARAM_CANNOT_BE_NULL(400, "参数不能为空"),
    CATEGORY_NOT_FOUND(404, "商品分类没有找到"),
    SPEC_GROUP_NOT_FOUND(404, "商品规格组没有查到"),
    BRAND_SAVE_ERROR(500, "新增品牌失败"),
    GOODS_SAVE_ERROR(500, "新增商品失败"),
    BRAND_NOT_FOUND(404, "品牌没有找到"),
    UPLOAD_FILE_ERROR(500, "文件上传失败"),
    INVALID_FILE_TYPE(400, "无效文件类型"),
    SPEC_PARAM_NOT_FOUND(404,"商品规格参数不存在"),
    GOODS_NOT_FOUND(404,"商品不存在"),
    SPU_DETAIL_NOT_FOUND(404, "商品详情不存在"),
    GOODS_SKU_NOT_FOUND(404,"sku没有找到");
    private int code;
    private String msg;
}

2.定义一个异常的结果集

package cn.carryshuai.自定义异常处理.vo;

import cn.carryshuai.自定义异常处理.enums.ExceptionEnum;
import lombok.Data;

@Data
public class ExceptionResult {
    private int status;
    private String message;
    private Long timestamp;

    public ExceptionResult(ExceptionEnum exceptionEnum) {
        this.status = exceptionEnum.getCode();
        this.message = exceptionEnum.getMsg();
        this.timestamp = System.currentTimeMillis();
    }
}

3.自定义一个异常，继承RunTimeException,里面放着定义的枚举类

package cn.carryshuai.自定义异常处理.exception;

import cn.carryshuai.自定义异常处理.enums.ExceptionEnum;
import lombok.AllArgsConstructor;
import lombok.Getter;
import lombok.NoArgsConstructor;

@NoArgsConstructor
@AllArgsConstructor
@Getter
public class CarryExcepttion extends RuntimeException {

    private ExceptionEnum exceptionEnum;
}

4.创建一个通知，拦截异常

package cn.carryshuai.自定义异常处理.advice;

import cn.carryshuai.自定义异常处理.enums.ExceptionEnum;
import cn.carryshuai.自定义异常处理.exception.CarryExcepttion;
import cn.carryshuai.自定义异常处理.vo.ExceptionResult;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;

/**
 * 拦截异常
 */

@ControllerAdvice
public class CommonExceptionHandler {
    @ExceptionHandler(CarryExcepttion.class)
    public ResponseEntity<ExceptionResult> handleException(CarryExcepttion carryExcepttion){
        ExceptionEnum em = carryExcepttion.getExceptionEnum();
        return ResponseEntity.status(em.getCode()).body(new ExceptionResult(em));

    }

}

5.使用自定义的异常

6.异常效果截图