根据url读取图片，直接压缩写到zip流【含判断url地址是否存在】

package cn.w.market.app.utils;import java.io.BufferedInputStream;import java.io.DataInputStream;import java.io.File;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL;import java.util.List;import java.util.zip.CRC32;import java.util.zip.CheckedOutputStream;import org.apache.tools.zip.ZipEntry;import org.apache.tools.zip.ZipOutputStream;import cn.w.market.modules.app.entity.AppWallpaperImage;import com.thinkgem.jeesite.common.utils.StringUtils;public class ImgCompressUtil {static final int BUFFER = 8192;/** *  * @Description:压缩一组appWallpaperImageList * @author:郑安邦 * @time:2013年9月13日  下午4:55:53 * @param appWallpaperImageList * @param zipFileRealFullPathName ：压缩包的实际地址"d://xxx//xx.zip" */public static void compressURLImgs2Zip(List<AppWallpaperImage> appWallpaperImageList,String zipFileRealFullPathName){ZipOutputStream out = null;try {File zipFile = new File(zipFileRealFullPathName);if(!zipFile.exists()){zipFile.getParentFile().mkdir();zipFile.createNewFile();}FileOutputStream fileOutputStream = new FileOutputStream(zipFile);CheckedOutputStream cos = new CheckedOutputStream(fileOutputStream,new CRC32());out = new ZipOutputStream(cos);for (AppWallpaperImage appWallpaperImage : appWallpaperImageList) {if(exists(appWallpaperImage.getImagePath())){downUrlImg2zip(appWallpaperImage.getImagePath(), out);}}} catch (FileNotFoundException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}finally{try {if(out!=null){out.flush();out.close();}} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}public  static void downUrlImg2zip(String urlAdd, ZipOutputStream out) {BufferedInputStream bufferedInputStream = null;try {URL url = new URL(urlAdd);int sufferPos = StringUtils.lastIndexOf(urlAdd, ".");String suffer = StringUtils.substring(urlAdd, sufferPos);String imgName = StringUtils.substring(urlAdd, StringUtils.lastIndexOf(urlAdd, "/")+1,sufferPos);String imgFullName = StringUtils.join(imgName,suffer);DataInputStream dataInputStream = new DataInputStream(url.openStream());bufferedInputStream = new BufferedInputStream(dataInputStream);out.putNextEntry(new ZipEntry(imgFullName));int byteRead = 0;  byte data[] = new byte[BUFFER];while((byteRead = bufferedInputStream.read(data,0,BUFFER)) != -1){  out.write(data, 0, byteRead);}} catch (MalformedURLException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}finally{try {bufferedInputStream.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}  }} static boolean exists(String URLName) {       try {           //设置此类是否应该自动执行 HTTP 重定向（响应代码为 3xx 的请求）。           HttpURLConnection.setFollowRedirects(false);           //到 URL 所引用的远程对象的连接           HttpURLConnection con = (HttpURLConnection) new URL(URLName)                  .openConnection();           /* 设置 URL 请求的方法， GET POST HEAD OPTIONS PUT DELETE TRACE 以上方法之一是合法的，具体取决于协议的限制。*/           con.setRequestMethod("HEAD");           //从 HTTP 响应消息获取状态码           return (con.getResponseCode() == HttpURLConnection.HTTP_OK);       } catch (Exception e) {           e.printStackTrace();           return false;        }    }}