public HttpServletRequest addvisit(HttpServletRequest req, HttpServletResponse response) {
User u = User.getInstance();
if (u == null) {
this.parent.redirect("login", true);
return req;
} else {
String id = req.getParameter("id");
Url url = u.getUrlById(Integer.valueOf(id));
url.addVisit();
return req;
}
}
