struts上传的跳转问题

在站内搜索了一下，没有找到类似的问题
1。页面只有上传的的form，包括：file框，text框，上传按钮。有时候能上传，有时不能上传成功，不成功提示http 500 dispatch[/photoManage]...错误，但是同样一个ActionForward为什么有时可以，有时不可以。
2。struts自带的token会不会影响上传呢？
3。是不是代码有问题，各位同胞们帮我看下，代码如下：

 

java 代码

// 上传一张照片
//class photoManage
public ActionForward sendOnePhoto(ActionMapping mapping, ActionForm form,
    HttpServletRequest request, HttpServletResponse response) {

    PhotoManageForm photoForm = (PhotoManageForm) form;
    HttpSession session = request.getSession();
    session.removeAttribute("photoname");
    String ep_no = (String) session.getAttribute("ep_no");

    String photo_name = photoForm.getPhoto_name();// 图片别名
    if (photo_name == null && "".equals(photo_name)) {
                         request.setAttribute("photoname", "isEmpty");
        return new ActionForward("/searchPhoto.do?flag=manage");
    }
    FormFile file = photoForm.getFile();
    String filename = file.getFileName();// 图片的源名+扩展名

    session.setAttribute("photoname", photo_name);
    int filesize = file.getFileSize();
    String firstname = "";

    if (isTokenValid(request, true)) {
        try {
            PhotoNameSearch namesearch = new PhotoNameSearch();
            firstname = namesearch.String2Alpha(photo_name).substring(0, 1);// 取图片别名首拼音
            System.out.println("首拼音是:" + firstname);
        } catch (Exception ex) {
            ex.printStackTrace();
        }
        // 用作文件名的处理
        Date date = new Date();
        String datename = date.toString();
        datename = datename.replaceAll(" ", "");
        datename = datename.replaceAll(":", "");
        String sql = "";// SQL语句

        if (filename != null && !filename.equals("")) {
            int index = filename.lastIndexOf(".");// 得到.的位置
            String sn = filename.substring(index, filename.length()); // 求得扩展名

            if (!sn.equalsIgnoreCase(".gif")
                && !sn.equalsIgnoreCase(".jpg")
                && !sn.equalsIgnoreCase(".png")) {
                return new ActionForward("/searchPhoto.do?selepno=" + ep_no+ "&error=format");
            }
            if (filesize > 1024 * 1024 * 5) {
                return new ActionForward("/searchPhoto.do?selepno=" + ep_no+ "&error=size");
            }

            Calendar c = Calendar.getInstance();
            SimpleDateFormat f = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
            String datetime = f.format(c.getTime());
            System.out.println("====" + datetime);

            String savepath = request.getRealPath("/") + "/upload/photo/"+ datename + sn;// 上传文件写到相应路径目录下
            sql = "insert into photo(ep_no,photo_name,photo_route,upload_date,firstname) values('"
            + StrTrans.transGbk(ep_no)
            + "','"
            + StrTrans.transGbk(photo_name)
            + "','"
            + StrTrans.transGbk(datename + sn)
            + "','"
            + datetime
            + "','" + firstname + "')";

            CommonDataBean commonDataBean = null;
            InputStream in = null;
            FileOutputStream out = null;

            try {
                in = file.getInputStream();
                out = new FileOutputStream(savepath);
                commonDataBean = new CommonDataBean();
                byte[] b = new byte[30000000];
                int i = 0;
                while ((i = in.read(b)) != -1) {
                    out.write(b, 0, i);
                }

                out.close();
                in.close();
                    commonDataBean.executeUpdate(sql);
                // 更新上传时间
                photoHandle ph = new photoHandle();
                ph.updatetime(ep_no);
            } catch (Exception e) {
                System.out.println(e.getMessage());
                e.printStackTrace();
                System.out.println("something wrong!");
            } finally {
                                 commonDataBean.closeConn();
            }
        }
        resetToken(request);
    } else {
        saveToken(request);
    }
    return new ActionForward("/searchPhoto.do?flag=manage");
}