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：

 1             String zipfilename = "test.zip";
 2             File zipfile = new File(zipfilename);
 3             org.apache.tools.ant.types.FileSet fileSet = new FileSet();
 4             org.apache.tools.ant.Project prj = new Project();
 5             org.apache.tools.ant.taskdefs.Zip zip = new Zip();
 6             zip.setProject(prj);
 7             zip.setDestFile(zipfile);
 8             fileSet.setProject(prj);
 9             fileSet.setDir(file); // 这里是文件路径的设置。
10             zip.addFileset(fileSet);
11             zip.execute();
12             HttpServletResponse response = super.currentResponse;
13             response.setHeader("Content-Type", "application/zip");
14             response.setHeader("content-disposition", "attachment;filename=" + URLEncoder.encode(zipfilename, "UTF-8"));
15             OutputStream os = response.getOutputStream();
16             InputStream is = new FileInputStream(zipfile);
17             DownloadUtil.transfer(is, os);
18             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

 1 String zipfilename = getServerZipFileName(inputfilename);
 2
 3         if (channel == null || !channel.isConnected()) {
 4             channel = SftpUtils.connect(sftpHost, Integer.parseInt(sftpPort), sftpUsername, sftpPassword);// 取得连接。
 5         }
 6
 7         HttpServletResponse response = super.currentResponse;
 8
 9         try {
10             boolean isMultiFilesName = isMultiFilesName(inputfilename);
11             Vector <com.jcraft.jsch.ChannelSftp.LsEntry> vs = channel.ls(logfilepath);
12             if (vs.isEmpty()) {
13                 return false;
14             } else {
15                 response.setHeader("Content-Type", "application/octet-stream");
16                 response.setHeader("content-disposition", "attachment;filename=" + URLEncoder.encode(zipfilename, "UTF-8"));
17                 OutputStream out = response.getOutputStream();
18                 java.util.zip.ZipOutputStream zipOut = new ZipOutputStream(new BufferedOutputStream(out));
19                 for (LsEntry entry : vs) {
20                     if (entry.getAttrs().toString().startsWith("-")) {
21                         String entryname = entry.getFilename();
22                         if (isMultiFilesName && entryname.startsWith(inputfilename.substring(0, inputfilename.length() - 1))
23                                 && !entryname.matches("^.*[\\*]+.*$") || entryname.equals(inputfilename)) { // 符合规则的文件才做输出处理
24                             java.util.zip.ZipEntry zipentry = new ZipEntry(entryname);
25                             zipOut.putNextEntry(zipentry);
26                             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。
27                             if (bis != null) {
28                                 int count = 0;
29                                 byte[] buffer = new byte[8192];
30                                 while ((count = bis.read(buffer)) > 0) {
31                                     zipOut.write(buffer, 0, count);
32                                 }
33                                 bis.close();
34                             }
35                         }
36                     }
37                 }
38                 zipOut.close();
39             }
40         } catch (Exception e) {
41             response.reset();
42             e.printStackTrace();
43             return false;
44         } finally {
45             if (channel != null && !channel.isClosed()) {
46                 channel.getSession().disconnect();
47                 channel.disconnect();
48             }
49         }