JAVA高级面试进阶训练营视频教程

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第一步：自定义一个枚举类型规范异常信息（一般公司会有自己的枚举类。这里只是举例的信息）

@Getter
public enum ExceptionEnum {
    INVALID_FILE_TYPE(400, "无效的文件类型！"),
    INVALID_PARAM_ERROR(400, "无效的请求参数！"),
    INVALID_PHONE_NUMBER(400, "无效的手机号码"),
    INVALID_VERIFY_CODE(400, "验证码错误！"),
    INVALID_USERNAME_PASSWORD(400, "无效的用户名和密码！"),
    INVALID_SERVER_ID_SECRET(400, "无效的服务id和密钥！"),
    INVALID_NOTIFY_PARAM(400, "回调参数有误！"),
    INVALID_NOTIFY_SIGN(400, "回调签名有误！"),

    CATEGORY_NOT_FOUND(404, "商品分类不存在！"),
    BRAND_NOT_FOUND(404, "品牌不存在！"),
    SPEC_NOT_FOUND(404, "规格不存在！"),
    GOODS_NOT_FOUND(404, "商品不存在！"),
    CARTS_NOT_FOUND(404, "购物车不存在！"),
    APPLICATION_NOT_FOUND(404, "应用不存在！"),
    ORDER_NOT_FOUND(404, "订单不存在！"),
    ORDER_DETAIL_NOT_FOUND(404, "订单数据不存在！"),

    DATA_TRANSFER_ERROR(500, "数据转换异常！"),
    INSERT_OPERATION_FAIL(500, "新增操作失败！"),
    UPDATE_OPERATION_FAIL(500, "更新操作失败！"),
    DELETE_OPERATION_FAIL(500, "删除操作失败！"),
    FILE_UPLOAD_ERROR(500, "文件上传失败！"),
    DIRECTORY_WRITER_ERROR(500, "目录写入失败！"),
    FILE_WRITER_ERROR(500, "文件写入失败！"),
    SEND_MESSAGE_ERROR(500, "短信发送失败！"),
    INVALID_ORDER_STATUS(500, "订单状态不正确！"),
    STOCK_NOT_ENOUGH_ERROR(500, "库存不足！"),

    UNAUTHORIZED(401, "登录失效或未登录！");

    private int status;
    private String message;

    ExceptionEnum(int status, String message) {
        this.status = status;
        this.message = message;
    }
}

 

第二步：自定义一个异常：

@Getter
public class LyException extends RuntimeException {

    private Integer status;

    public LyException(Integer status, String message) {
        super(message);
        this.status = status;
    }

    public LyException(ExceptionEnum exceptionEnum) {
        super(exceptionEnum.getMessage());
        this.status = exceptionEnum.getStatus();
    }
}

 

第三步：自定义一个异常返回对象（不是异常，是返回对象，这里也是举例的信息）

@Getter
public class LyExceptionResult {

    private int status;
    private String message;
    private String timestamp;

    public LyExceptionResult(LyException e) {
        this.status = e.getStatus();
        this.message = e.getMessage();
        this.timestamp = DateTime.now().toString("yyyy-MM-dd HH:mm:ss");
    }
}

 

 

 

第四步：自定义异常处理器

@ControllerAdvice注解：默认情况下，会拦截所有加了@Controller的类

@ControllerAdvice
public class LyExceptionControllerAdvice {

    /**
     * 拦截LyException
     */
    @ExceptionHandler(LyException.class)
    public ResponseEntity<LyExceptionResult> handlerLyException(LyException e){
        return ResponseEntity.status(e.getStatus()).body(new LyExceptionResult(e));
    }
}