java 文件 批量下载，多个文件用压缩包实现

/***
	 * obtain outputstream
	 * 
	 * @param uploadifyFile 文件对象
	 * @param out
	 * @throws Exception
	 */
	public void beachDownloadUploadify(List<UploadifyFile> uploadifyFiles, OutputStream out) {
		if (UtilGet.listIsEmpty(uploadifyFiles)) {
			// change UploadifyFile to outputstream 
			Date currentTime = new Date();
			SimpleDateFormat formatter = new SimpleDateFormat(Constants.FORMATNAME);
			Random r = new Random();
			String time =formatter.format(currentTime);
			String tempMulit = Constants.TEMP_DOWNLOAD + time + r.nextDouble()+r.nextLong()+r.nextLong()+r.nextInt();//临时文件目录(做压缩文件用)
			String mulitPath = tempMulit+Constants.ZIPFILE;//压缩文件目录
			File tempDownload = new File(tempMulit);
			if (!tempDownload.exists() || !tempDownload.isDirectory()) {
				tempDownload.mkdirs();
			}
			try {
				File zipFiel = new File(mulitPath);
				ZipArchiveOutputStream zipOutput = new ZipArchiveOutputStream(zipFiel);
				zipOutput.setEncoding("GBK");
				//将文件写入压缩文件夹
				for (UploadifyFile uploadifyFile : uploadifyFiles) {
					String filePath = Constants.BASEPATH + Constants.SEP + uploadifyFile.getFilePath() + Constants.SEP
							+ uploadifyFile.getRegisterName() + uploadifyFile.getRegisterExt();
					File inputFile = new File(filePath);
					zipOutput.putArchiveEntry(new ZipArchiveEntry(uploadifyFile.getOriginalFileFullName()));
					FileInputStream in = new FileInputStream(inputFile);
					int b;
					while ((b = in.read()) != -1) {
						zipOutput.write(b);
					}
					in.close();
				}
				zipOutput.closeArchiveEntry();
				zipOutput.close();
				if (null != tempDownload && tempDownload.isDirectory()) {
					FileUtils.deleteDirectory(tempDownload);
				}
				File file = new File(mulitPath);
				FileInputStream fis = new FileInputStream(file);
				BufferedInputStream buff = new BufferedInputStream(fis);
				byte[] b = new byte[10240];
				long k = 0;
				while (k < file.length()) {
					int j = buff.read(b, 0, 10240);
					k += j;
					out.write(b, 0, j);
				}
				out.flush();
				if (null != buff) {
					buff.close();
				}
				if (null != out) {
					out.close();
				}
				
				if(null!=zipFiel&&zipFiel.isFile()){
					FileUtils.deleteQuietly(zipFiel);
				}
			} catch (Exception e) {
				log.warn(e);
			}
		}
	}

 

    组装文件对象:

 

	@Override
	@SuppressWarnings("unchecked")
	public void beachFileDownload(String ruleStr, OutputStream out) throws Exception {
		String hqlTemp = StringUtils.replace(ruleStr, ";", "','");
		List<AttachFile> list = (List<AttachFile>) baseManager.getAll(" requireFileCode in ('" + hqlTemp + "') ");
		List<UploadifyFile> uploadifies = new ArrayList<UploadifyFile>();
		if (UtilGet.isCheckList(list)) {
			for (AttachFile attachFile : list) {
				if (null != attachFile) {
					UploadifyFile uploadifyFile = new UploadifyFile();
					uploadifyFile.setFileCode(attachFile.getRequireFileCode());
					uploadifyFile.setRegisterName(StringUtils.substring(attachFile.getPhysicalFile(), 0,
							StringUtils.lastIndexOf(attachFile.getPhysicalFile(), ".")));
					uploadifyFile.setRegisterExt(StringUtils.substring(attachFile.getPhysicalFile(),
							StringUtils.lastIndexOf(attachFile.getPhysicalFile(), ".")));
					uploadifyFile.setFilePath(StringUtils.substring(attachFile.getFileUrl(), 0,
							StringUtils.lastIndexOf(attachFile.getFileUrl(), attachFile.getPhysicalFile()) - 1));
					uploadifyFile.setOriginalFileFullName(attachFile.getFileName());
					uploadifies.add(uploadifyFile);
				}
			}
			DownloadUploadifyUtil downloadUploadifyUtil = new DownloadUploadifyUtil();
			downloadUploadifyUtil.beachDownloadUploadify(uploadifies, out);
		}
	}

 

    controller 层 调用

 

/****
	 * 批量下载
	 * @param attachFileRecord
	 * @param request
	 * @param response
	 */
	@RequestMapping(method =RequestMethod.GET, value = PBDOWNLOAD, params = "method=beathDownload")
	public void beachDownload(AttachFileRecord attachFileRecord, HttpServletRequest request, HttpServletResponse response) {
		String ids = request.getParameter(ID);
		try {
			if (StringUtils.isNotBlank(ids)) {
				int i = StringUtils.split(ids,";").length;
				response.setContentType("text/html; charset=GBK");
				String fileName = DownloadUploadifyUtil.strByteGB("档案库文档["+i+"].zip", request);
				response.setContentType("application/x-msdownload");
				OutputStream out=response.getOutputStream();
				response.setHeader("Content-Disposition", "attachment;filename=" + fileName);
				attachFileService.beachFileDownload(ids,out);
			}
		} catch (IOException e) {
			e.printStackTrace();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}