校园商铺-4店铺注册功能模块-5店铺注册之Service层的实现

1. 创建接口

ShopService.java

package com.csj2018.o2o.service;

import java.io.File;
import com.csj2018.o2o.entity.Shop;
import com.csj2018.o2o.dto.ShopExecution;
public interface ShopService {
	ShopExecution addShop(Shop shop,File shopImg);
}

2. 创建店铺操作异常类

为什么会用RuntimeException，而不是Exception呢？

当我们的程序仅当跑出RuntimeException或者继承RuntimeException的异常类时，事物才得以终止并回滚。如果是Exception，事物就无法终止和回滚
```#java
package com.csj2018.o2o.exceptions;

public class ShopOperationException extends RuntimeException{

/**

*

*/

private static final long serialVersionUID = -4379928435508967105L;

public ShopOperationException(String msg) {

super(msg);

}

}

##    3. 创建接口的实现类
```#java
package com.csj2018.o2o.service.impl;

import java.io.File;
import java.util.Date;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import com.csj2018.o2o.dao.ShopDao;
import com.csj2018.o2o.dto.ShopExecution;
import com.csj2018.o2o.entity.Shop;
import com.csj2018.o2o.enums.ShopStateEnum;
import com.csj2018.o2o.execptions.ShopOperationException;
import com.csj2018.o2o.service.ShopService;
import com.csj2018.o2o.util.ImageUtil;
import com.csj2018.o2o.util.PathUtil;

@Service
public class ShopServiceImpl implements ShopService {
	@Autowired
	private ShopDao shopDao;
	@Override
	@Transactional
	public ShopExecution addShop(Shop shop,File shopImg) {
		//控制判断，shop是不是包含必须的一些值
		if(shop == null) {
			return new ShopExecution(ShopStateEnum.NUll_SHOP);
		}
		//增加对Shop其他引入类非空的判断
		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 = shopDao.insertShop(shop);
			if(effectedNum <= 0) {
				throw new ShopOperationException("店铺创建失败");
			}else {
				if(shopImg != null) {
					//存储图片
					try {
						addShopImage(shop,shopImg);
					}catch (Exception e) {
						throw new ShopOperationException("addShopImg error:"+e.getMessage());
					}
					//更新店铺的图片信息
					effectedNum = shopDao.updateShop(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 addShopImage(Shop shop, File shopImg) {
		// 获取shop图片目录的相对路径
		String dest = PathUtil.getShopImagePath(shop.getShopId());
		String shopImgAddr = ImageUtil.generateThumbnail(shopImg, dest);
		shop.setShopImg(shopImgAddr);
	}
}

4. 创建单元测试类

package com.csj2018.o2o.service;

import static org.junit.Assert.assertEquals;

import java.io.File;
import java.util.Date;

import org.junit.Test;
import org.springframework.beans.factory.annotation.Autowired;
import com.csj2018.o2o.BaseTest;
import com.csj2018.o2o.dto.ShopExecution;
import com.csj2018.o2o.entity.Area;
import com.csj2018.o2o.entity.PersonInfo;
import com.csj2018.o2o.entity.Shop;
import com.csj2018.o2o.entity.ShopCategory;
import com.csj2018.o2o.enums.ShopStateEnum;

public class ShopServiceTest extends BaseTest{
	@Autowired
	private ShopService shopService;

	@Test
	public void testAddShop() {
		Shop shop = new Shop();

		PersonInfo owner = new PersonInfo();
		Area area = new Area();
		ShopCategory shopCategory = new ShopCategory();
		owner.setUserId(1L);
		area.setAreaId(2);
		shopCategory.setShopCategoryId(1L);

		shop.setOwner(owner);
		shop.setArea(area);
		shop.setShopCategory(shopCategory);
		shop.setShopName("测试de店铺1");
		shop.setShopDesc("店铺描述1");
		shop.setShopAddr("测试路1号1");
		shop.setPhone("1234567891");
		shop.setPriority(5);
		shop.setCreateTime(new Date());
		shop.setEnableStatus(ShopStateEnum.CHECK.getState());
		shop.setAdvice("审核中");
		File shopImg = new File("/Users/chenshanju/Downloads/cat.jpg");
		ShopExecution se = shopService.addShop(shop, shopImg);
		assertEquals(ShopStateEnum.CHECK.getState(), se.getState());
	}
}

## 5. 总结
* 1.需要将店铺的信息插入到数据库当中
* 2.返回店铺的id
* 3.通过店铺id去创建出存储图片的文件夹，在文件夹下处理图片
* 4.在把文件夹的地址更新到数据里面去