public ActionForward execute(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse res)
throws Exception {
HttpSession session = request.getSession();
UserDAO dao = UserDAO.getInstance();
String confirmcode = dao.generatePassword();
session.setAttribute(IConst.SESSION.CONFIRM_CODE, confirmcode);
res.setContentType(IConst.JSP.JPG_CONTENT_TYPE);
res.setHeader("Pragma", "no-cache");
res.setHeader("Cache-Control", "no-cache");
res.setDateHeader("Expires", 0);