校园商铺-6店铺编辑列表和列表功能-2店铺信息编辑之Service层的实现
1.Service类ShopService.java
package com.csj2018.o2o.service;
import java.io.InputStream;
import com.csj2018.o2o.entity.Shop;
import com.csj2018.o2o.exceptions.ShopOperationException;
import com.csj2018.o2o.dto.ShopExecution;
public interface ShopService {
/**
* 通过店铺ID获取店铺信息
* @param shopId
* @return
*/
Shop getByShopId(long shopId);
/**
* 更新店铺信息，包括对图片的处理
* @param shop
* @param shopImgInputStream
* @param fileName
* @return
*/
ShopExecution modifyShop(Shop shop,InputStream shopImgInputStream,String fileName) throws ShopOperationException;
/**
* 注册店铺信息，包括图片处理
* @param shop
* @param shopImgInputStream
* @param fileName
* @return
*/
ShopExecution addShop(Shop shop,InputStream shopImgInputStream,String fileName) throws ShopOperationException;
}
2.编写工具类删除原有图片
修改店铺有2步：
- 1.判断是否需要处理图片
- 2.更新店铺信息
需要编写一个工具方法deleteFileOfPath：一旦有图片，就会将旧的图片删除掉
ImageUtil.java
package com.csj2018.o2o.util;
import java.io.File;
import java.io.InputStream;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Random;
import javax.imageio.ImageIO;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.multipart.commons.CommonsMultipartFile;
import net.coobird.thumbnailator.Thumbnails;
import net.coobird.thumbnailator.geometry.Positions;
public class ImageUtil {
private static String basePath = Thread.currentThread().getContextClassLoader().getResource("").getPath();
private static final SimpleDateFormat sDateFormat = new SimpleDateFormat("yyyyMMddHHmmss");
private static final Random r = new Random();
private static Logger logger = LoggerFactory.getLogger(ImageUtil.class);
/**
* 将文件流CommonsMultipartFile转换成File
* @param cFile
* @return
*/
public static File transferCommonsMultipartFileToFile(CommonsMultipartFile cFile) {
File newFile = new File(cFile.getOriginalFilename());
try {
cFile.transferTo(newFile);
}catch(IllegalStateException e) {
logger.error(e.toString());
e.printStackTrace();;
}catch (IOException e) {
logger.error(e.toString());
e.printStackTrace();
}
return newFile;
}
/**
* 根据输入流，处理缩略图，并返回新生成图片的相对路径
* @param thumbnailInputStream
* @param targetAddr
* @return
*/
public static String generateThumbnail(InputStream thumbnailInputStream,String fileName ,String targetAddr) {
String realFileName = getRandomFileName();
String extension = getFileExtension(fileName);
makeDirPath(targetAddr);
String relativeAddr = targetAddr + realFileName + extension;
logger.debug("current relativeAddr is:" + relativeAddr);
File dest = new File(PathUtil.getImgBasePath()+relativeAddr);
logger.debug("current complete addr is:" + PathUtil.getImgBasePath()+relativeAddr);
try {
Thumbnails.of(thumbnailInputStream).size(200,200).watermark(Positions.BOTTOM_RIGHT,ImageIO.read(new File(basePath+"/newwater.png")),0.8f)
.outputQuality(0.8f).toFile(dest);
}catch (IOException e) {
logger.error(e.toString());
e.printStackTrace();
}
return relativeAddr;
}
/**
* 创建目标路径所设计的目录，即/a/b/c/xxx.jpg
* 那么a b c 这三个文件夹都得自动创建
* @param targetAddr
*/
private static void makeDirPath(String targetAddr) {
String realFileParentPath = PathUtil.getImgBasePath()+targetAddr;
File dirPath = new File(realFileParentPath);
if(!dirPath.exists()) {
dirPath.mkdirs();//上级目录不存在，也一并创建，同mkdir -p
}
}
/**
* 获取输入文件流的扩展名
* @param thumbnail
* @return
*/
private static String getFileExtension(String fileName) {
//输入的图片，只需或获取最后一个 . 后面的字符即可
return fileName.substring(fileName.lastIndexOf("."));
}
/**
* 生成随机文件名，当前年月日时分秒+5位随机数
* @param args
* @throws Exception
*/
public static String getRandomFileName() {
//获取随机的5位数：10000-99999
int rannum = r.nextInt(89999)+10000;
String nowTimeStr = sDateFormat.format(new Date());
return nowTimeStr + rannum;
}
public static void main(String[] args) throws Exception {
Thumbnails.of(new File(basePath + "/water.png")).size(30, 30).toFile(new File(basePath + "/newwater.png"));
// Thumbnails.of(new File("/Users/chenshanju/Downloads/cat.jpg")).size(200, 200)
// .watermark(Positions.BOTTOM_RIGHT, ImageIO.read(new File(basePath + "newwater.png")), 1.0f)
// .outputQuality(0.8).toFile("/Users/chenshanju/Downloads/newcat.jpg");
}
/**
* storePath是文件的路径还是目录的路径
* 如果storePath是文件路径则删除该文件；
* 如果storePath是目录路径则删除该目录下的所有文件
* @param storePath
*/
public static void deleteFileOfPath(String storePath) {
File fileOrPath = new File(PathUtil.getImgBasePath() + storePath);
if(fileOrPath.exists()) {
if(fileOrPath.isDirectory()) {
File[] files = fileOrPath.listFiles();
for(int i=0;i<files.length;i++) {
files[i].delete();
}
}
fileOrPath.delete();
}
}
}
3.Service实现类ShopServiceImpl.java
package com.csj2018.o2o.service.impl;
import java.io.InputStream;
import java.util.Date;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
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.exceptions.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 {
private Logger logger = LoggerFactory.getLogger(ShopServiceImpl.class);
@Autowired
private ShopDao shopDao;
@Override
@Transactional
public ShopExecution addShop(Shop shop, InputStream shopImgInputStream, String fileName) {
// 控制判断，shop是不是包含必需的值
if (shop == null) {
logger.warn("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);
logger.warn("添加结果：" + effectedNum + "shopId:" + shop.getShopId());
if (effectedNum <= 0) {
throw new ShopOperationException("店铺创建失败");
} else {
if (shopImgInputStream != null) {
// 存储图片
try {
addShopImage(shop, shopImgInputStream, fileName);
} 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, InputStream shopImg, String fileName) {
// 获取shop图片目录的相对路径
String dest = PathUtil.getShopImagePath(shop.getShopId());
String shopImgAddr = ImageUtil.generateThumbnail(shopImg, fileName, dest);
shop.setShopImg(shopImgAddr);
}
@Override
public Shop getByShopId(long shopId) {
return shopDao.queryByShopId(shopId);
}
@Override
public ShopExecution modifyShop(Shop shop, InputStream shopImgInputStream, String fileName)
throws ShopOperationException {
if (shop == null || shop.getShopId() == null) {
return new ShopExecution(ShopStateEnum.NUll_SHOP);
} else {
try {
// 1.判断是否需要处理图片
if (shopImgInputStream != null && fileName != null && !"".equals(fileName)) {
Shop tempShop = shopDao.queryByShopId(shop.getShopId());
if (tempShop.getShopImg() != null) {
//编写工具类，删除图片信息
ImageUtil.deleteFileOfPath(tempShop.getShopImg());
}
addShopImage(shop, shopImgInputStream, fileName);
}
// 2.更新店铺信息
shop.setLastEditTime(new Date());
int effectedNum = shopDao.updateShop(shop);
if (effectedNum <= 0) {
return new ShopExecution(ShopStateEnum.INNER_ERROR);
} else {
shop = shopDao.queryByShopId(shop.getShopId());
return new ShopExecution(ShopStateEnum.SUCCESS, shop);
}
} catch (Exception e) {
throw new ShopOperationException("modifyShop error:" + e.getMessage());
}
}
}
}
4.测试类
package com.csj2018.o2o.service;
import static org.junit.Assert.assertEquals;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStream;
import java.util.Date;
import org.junit.Ignore;
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;
import com.csj2018.o2o.exceptions.ShopOperationException;
public class ShopServiceTest extends BaseTest{
@Autowired
private ShopService shopService;
@Test
public void testModifyShop() throws ShopOperationException,FileNotFoundException{
Shop shop = new Shop();
shop.setShopId(1L);
shop.setShopName("修改后的店铺名称");
InputStream is = new FileInputStream("/Users/chenshanju/Downloads/liuchuanfeng.jpeg");
ShopExecution shopExecution = shopService.modifyShop(shop, is, "流川枫.jpeg");
System.out.println("新的图片地址："+shopExecution.getShop().getShopImg());
}
}
问题：
1.判断是否有图片时，增加图片属性时传入的为什么是shop，而不是tempShop？
原因：addShopImg会在方法里对shop进行操作，并且附上一个新的图片地址，后面会用shop对店铺信息进行更新。而tempShop仅存在当前代码块。
// 1.判断是否需要处理图片
if (shopImgInputStream != null && fileName != null && !"".equals(fileName)) {
Shop tempShop = shopDao.queryByShopId(shop.getShopId());
if (tempShop.getShopImg() != null) {
//编写工具类，删除图片信息
ImageUtil.deleteFileOfPath(tempShop.getShopImg());
}
addShopImage(shop, shopImgInputStream, fileName);
}
