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

Posted 2021-03-14 csj2018

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);
                }