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();
            }
        }