public void add(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // 获取参数值
        Article article = new Article();
        try {
            article = (Article) RequestUtil.copyParams(Article.class, request);
        } catch (InvocationTargetException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        // 从request中获得上传文件的有关信息
        Attachment[] attachments = (Attachment[]) request.getParameterMap().get("attachs");
        if (attachments != null) {
            for (Attachment atta : attachments) {
                System.out.println((atta).getName() + ",已经被上传，文件类型是：" + (atta).getContentType());
            }
        }
        article.setCreatetime(new Date());
        articleDao.addArticle(article);

        request.getRequestDispatcher("add_article_success.jsp").forward(request, response);
    }

Attachment[] attachments = (Attachment[]) request.getParameterMap().get("attachs");