java打包下載下傳檔案

java打包下載下傳檔案，需要使用apache的ant.jar，代碼如下：

public void exportAllQrCode(HttpServletRequest request,HttpServletResponse response){
        List<StoreInformation> storeList = storeInformationService.getAllByList();
        String urlStr = "";
        try {
            String fileName = "aa.zip";
            File f = new File(request.getRealPath("")+"/temp");
            if(!f.exists()){
                f.mkdir();
            }
            String outFilePath = request.getRealPath("")+"/temp/"+fileName;
            File file = new File(outFilePath);
            ZipOutputStream zipout = new ZipOutputStream(new FileOutputStream(file));
            byte[] buffer = new byte[];

            DataInputStream dataInputStream = null;
            String siid = "";
            String siname = "";
            if(storeList!=null && storeList.size()>){
                for(int i=;i<storeList.size();i++){
                    siid = storeList.get(i).getSiid();
                    siname = storeList.get(i).getSiname();
                    urlStr = Utils.getBasePath(request)+"/code/pic/"+siid+".jpg";
                    URL url = new URL(urlStr);
                    dataInputStream = new DataInputStream(url.openStream());
                    zipout.setEncoding("GBK");
                    zipout.putNextEntry(new ZipEntry(siname+".jpg"));
                    int len = ;
                    while((len=dataInputStream.read(buffer))>){
                     zipout.write(buffer, , len);
                    }
                    zipout.closeEntry();
                    dataInputStream.close();
                }
            }
            zipout.close();
            LOGGER.info("***********zip檔案生成成功*********");
            //******URL中帶中文****//
            urlStr = Utils.getBasePath(request)+"/temp/"+fileName;
            URL url = new URL(urlStr);
            DataInputStream ds = new DataInputStream(url.openStream());
            response.setHeader("Content-Disposition", "attachment;filename="+fileName);
            BufferedOutputStream out = new BufferedOutputStream(response.getOutputStream());
            int length = ;
            while((length=ds.read(buffer))!=-){
                out.write(buffer, , length);
                out.flush();
            }
            ds.close();
            out.close();
            file.delete();
        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (FileNotFoundException e){
            e.printStackTrace();
            throw new RuntimeException("生成壓縮包時，源檔案不存在："+urlStr, e);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }