public File doAttachment(HttpServletRequest request)
			throws ServletException, IOException {
		File file = null;
		DiskFileItemFactory factory = new DiskFileItemFactory();
		ServletFileUpload upload = new ServletFileUpload(factory);
		try {
			List<?> items = upload.parseRequest(request);
			Iterator<?> itr = items.iterator();
			while (itr.hasNext()) {
				FileItem item = (FileItem) itr.next();
				if (item.isFormField()) {
					parameters
							.put(item.getFieldName(), item.getString("UTF-8"));
				} else {
					File tempFile = new File(item.getName());
					file = new File(sc.getRealPath("/") + savePath, tempFile
							.getName());
					item.write(file);
				}
			}
		} catch (Exception e) {
			Logger logger = Logger.getLogger(SendAttachmentMailServlet.class);
			logger.error("邮件发送出了异常", e);
		}
		return file;
	}
 @Override
 public List<Cookie> getCookies() {
   final List<Cookie> list = new ArrayList<>();
   for (final javax.servlet.http.Cookie c : req.getCookies()) list.add(new BXServletCookie(c));
   return list;
 }