Web端文件打包.zip下载

使用ant.jar包的API进行文件夹打包。直接上代码：

             String zipfilename = "test.zip";
             File zipfile = new File(zipfilename);
             org.apache.tools.ant.types.FileSet fileSet = new FileSet();
             org.apache.tools.ant.Project prj = new Project();
             org.apache.tools.ant.taskdefs.Zip zip = new Zip();
             zip.setProject(prj);
             zip.setDestFile(zipfile);
             fileSet.setProject(prj);
             fileSet.setDir(file); // 这里是文件路径的设置。
             zip.addFileset(fileSet);
             zip.execute();
             HttpServletResponse response = super.currentResponse;
             response.setHeader("Content-Type", "application/zip");
             response.setHeader("content-disposition", "attachment;filename=" + URLEncoder.encode(zipfilename, "UTF-8"));
             OutputStream os = response.getOutputStream();
             InputStream is = new FileInputStream(zipfile);
             DownloadUtil.transfer(is, os);
             zipfile.delete();

如果在下载的时候，不希望下载文件路径下的所有文件，而是部分符合自己需求的文件的话。

下面这个例子，除了check了需求之外，还远端的文件进行了操作，利用ChannelSftp取得的连接，进行文件读入并下载。

如下：

private com.jcraft.jsch.ChannelSftp         channel; // 这行是类成员变量

 String zipfilename = getServerZipFileName(inputfilename);

         if (channel == null || !channel.isConnected()) {
             channel = SftpUtils.connect(sftpHost, Integer.parseInt(sftpPort), sftpUsername, sftpPassword);// 取得连接。
         }

         HttpServletResponse response = super.currentResponse;

         try {
             boolean isMultiFilesName = isMultiFilesName(inputfilename);
             Vector <com.jcraft.jsch.ChannelSftp.LsEntry> vs = channel.ls(logfilepath);
             if (vs.isEmpty()) {
                 return false;
             } else {
                 response.setHeader("Content-Type", "application/octet-stream");
                 response.setHeader("content-disposition", "attachment;filename=" + URLEncoder.encode(zipfilename, "UTF-8"));
                 OutputStream out = response.getOutputStream();
                 java.util.zip.ZipOutputStream zipOut = new ZipOutputStream(new BufferedOutputStream(out));
                 for (LsEntry entry : vs) {
                     if (entry.getAttrs().toString().startsWith("-")) {
                         String entryname = entry.getFilename();
                         if (isMultiFilesName && entryname.startsWith(inputfilename.substring(0, inputfilename.length() - 1))
                                 && !entryname.matches("^.*[\\*]+.*$") || entryname.equals(inputfilename)) { // 符合规则的文件才做输出处理
                             java.util.zip.ZipEntry zipentry = new ZipEntry(entryname);
                             zipOut.putNextEntry(zipentry);
                             InputStream bis = channel.get(logfilepath + entryname); // 这里要注意，目标目录下的文件名称，不能有*，不然这一步get方法的目标可能是多个文件而出错。
                             if (bis != null) {
                                 int count = 0;
                                 byte[] buffer = new byte[8192];
                                 while ((count = bis.read(buffer)) > 0) {
                                     zipOut.write(buffer, 0, count);
                                 }
                                 bis.close();
                             }
                         }
                     }
                 }
                 zipOut.close();
             }
         } catch (Exception e) {
             response.reset();
             e.printStackTrace();
             return false;
         } finally {
             if (channel != null && !channel.isClosed()) {
                 channel.getSession().disconnect();
                 channel.disconnect();
             }
         }