public static void download(String path, HttpServletResponse response) {  try {    // path是指欲下載的文件的路徑。    File file = new File(path);    // 取得文件名。    String filename = file.getName();    // 取得文件的后綴名。    String ext = filename.substring(filename.lastIndexOf(".") + 1).toUpperCase();    // 以流的形式下載文件。    InputStream fis = new BufferedInputStream(new FileInputStream(path));    byte[] buffer = new byte[fis.available()];    fis.read(buffer);    fis.close();    // 清空response    response.reset();    // 設置response的Header    response.addHeader("Content-Disposition", "attachment;filename="        + new String(filename.getBytes()));    response.addHeader("Content-Length", "" + file.length());    OutputStream toClient = new BufferedOutputStream(        response.getOutputStream());    response.setContentType("application/octet-stream");    toClient.write(buffer);    toClient.flush();    toClient.close();  } catch (IOException ex) {    ex.printStackTrace();  }}