开发异常处理

提供一个自定义异常对象

/**
 * 自定义异常对象，定义异常状态码
 */
@Getter // get方法
public class LyException extends RuntimeException{
    private Integer status;

    /**
     * 自己定义的异常信息状态
     * @param status
     * @param message
     */
    public LyException(Integer status,String message) {
        super(message);
        this.status = status;
    }

    /**
     * 通用异常信息显示
     * @param exceptionEnum
     */
    public LyException(ExceptionEnum exceptionEnum) {
        super(exceptionEnum.getMessage());
        this.status = exceptionEnum.getStatus();
    }
}

提供一个自定义异常返回结果对象

import lombok.Getter;
import org.joda.time.DateTime;

/**
 * 发生异常时，返回一个异常信息对象
 */
@Getter
public class ExceptionResult {
    private Integer status;
    private String message;
    private String timestamp;

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

提供一个自己处理异常的处理器对象

import lombok.extern.slf4j.Slf4j;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;

/**
 * 异常信息处理类
 */
@ControllerAdvice
@Slf4j
public class BasicExceptionAdvice {

    /**
     * 处理LyException的异常的信息
     * @param e
     * @return
     */
    @ExceptionHandler(LyException.class)
    public ResponseEntity<ExceptionResult> handleExecption(LyException e){
        return ResponseEntity.status(e.getStatus()).body(new ExceptionResult(e));
    }
}

提供一个枚举对象来规范异常提示信息状态码

import lombok.Getter;

/**
 * 异常信息枚举类
 */

@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**！"),
    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;

    // 枚举类型不能为public，不能被外部调用
    ExceptionEnum(int status, String message) {
        this.status = status;
        this.message = message;
    }
}