public ActionForward uploadPic(ActionMapping mapping, ActionForm form,
            HttpServletRequest request, HttpServletResponse response)
            throws Exception {
      //这里的request是MultipartRequestWrapper
      request.getSession().setAttribute(key, value);
      // 打印sessionid
      System.out.println("sessionid:" + ((MultipartRequestWrapper) request).getRequest().getRequestedSessionId());
      System.out.println("sessionid:" + request.getRequestedSessionId());

return null;
}

public ActionForward test(ActionMapping mapping, ActionForm form,
            HttpServletRequest request, HttpServletResponse response)
            throws Exception {
                  // 这里的request是RequestFacade 得不到上面session里面的值
        request.getSession().getAttribute(key);
                  // 打印sessionid
        System.out.println("sessionid:" + request.getRequestedSessionId());
        return null;
    }