对封装类的新增

最新推荐文章于 2022-09-29 16:37:36 发布

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最新推荐文章于 2022-09-29 16:37:36 发布

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本文链接：https://blog.youkuaiyun.com/sssmhs/article/details/99701471

本文深入解析ShopServiceImpl类的实现细节，该类通过@Service注解标识为Spring管理的服务组件，负责处理与店铺信息相关的业务逻辑。文章重点介绍了addShop方法，此方法在事务环境下运行，用于新增店铺信息并处理店铺图片上传。当店铺对象为空时，返回NULL_SHOP状态；成功创建店铺时，设置店铺的启用状态、创建时间和最后编辑时间，并调用Mapper层的insert方法插入数据库。若图片存在，则调用addShopImg方法进行图片存储，并更新店铺信息。

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代码如下

ShopServiceImpl类


@Service
public class ShopServiceImpl implements ShopService {
	
	@Autowired
	TbShopMapper shopMapper;
	
	@Transactional
	@Override
	public ShopExecution addShop(TbShop shop, File shopImg) {
		//空值判断
		if(shop == null) {
			return new ShopExecution(ShopStateEnum.NULL_SHOP);
		}
		try {
			//给店铺信息赋初始值
			shop.setEnableStatus(0);
			shop.setCreateTime(new Date());
			shop.setLastEditTime(new Date());
			//添加店铺信息
			int effectedNum = shopMapper.insert(shop);
			if(effectedNum <= 0) {
			//用RuntimeException原因而不用Exception，因为用RuntimeException时遇到异常时会回滚，而Exception不会
				throw new ShopOperationException("店铺创建失败");
			}else {
				if(shopImg != null) {
					//存储图片
					try {
						addShopImg(shop,shopImg);
					} catch (Exception e) {
						throw new ShopOperationException("addShopImg error:"+e.getMessage()+shopImg.getName());
					}
					//更新图片地址
					effectedNum = shopMapper.updateByPrimaryKey(shop);
					if(effectedNum <= 0) {
						throw new ShopOperationException("更新图片地址失败");
					}
				}
			}
		} catch (Exception e) {
			throw new ShopOperationException("addShop error:" + e.getMessage());
		}
		return new ShopExecution(ShopStateEnum.CHECK,shop);
	}

	private void addShopImg(TbShop shop, File shopImg) {
		//获取shop图片目录的相对值路径
		String dest = PathUtil.getShopImagePath(shop.getShopId());//"E:/project/upload/item/shop/" + shopId + "/"
		String shopImgAddr = ImageUtil.generateThumbnail(shopImg, dest);//这里的工能看另一篇博客
		shop.setShopImg(shopImgAddr);
	}

}

注意：ShopExecution异常类是对RuntimeException的封装异常类，为了直观的观察异常类。