java优雅的进行异常处理

逃离我推掉我的手 2022-04-10 01:20 268阅读 0赞

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

![20181219131230376.png][]

6.异常效果截图

![20181219131119214.png][]

[20181219131230376.png]: /images/20220404/cca3b14a2d0a4bf78e460ebd6e70324e.png
[20181219131119214.png]: /images/20220404/477b488054464acaa6404e22834d8484.png