getting url of browser

getting url of browser

I'm trying to add a filter between some servlets and jsp for the user
logged in before displaying the jsp. The problem is that I am trying to
retrieve the URL of the browser which that was forwarded to the login
page, but I can't find how. I've tried to get the URI at the Filter and to
send it as an attribute of a request to the Connexion servlet but, it
doesn't work.
my doFilter()
package com.forum.filters;
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
public class RestrictionFilter implements Filter {
public static final String CONNEXION = "/WEB-INF/connexion.jsp";
public static final String ATT_USER = "utilisateur";
public static final String CHEMIN = "chemin";
public void destroy() {
}
public void doFilter(ServletRequest req, ServletResponse res,
FilterChain chain) throws IOException, ServletException {
HttpServletRequest request = (HttpServletRequest) req;
HttpServletResponse response = (HttpServletResponse) res;
String chemin = request.getRequestURI().substring(
request.getContextPath().length());
HttpSession session = request.getSession();
if (session.getAttribute(ATT_USER) == null) {
request.setAttribute(CHEMIN, chemin);
request.getRequestDispatcher(CONNEXION).forward(request,
response);
} else {
chain.doFilter(request, response);
}
}
public void init(FilterConfig fConfig) throws ServletException {
}
}
my Connexion servlet
package com.forum.servlets;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import com.forum.beans.Utilisateur;
import com.forum.form.ConnexionForm;
public class Connexion extends HttpServlet {
public static final String ATT_USER = "utilisateur";
public static final String ATT_FORM = "form";
public static final String VUE = "/WEB-INF/connexion.jsp";
public void doGet(HttpServletRequest request, HttpServletResponse
response)
throws ServletException, IOException {
this.getServletContext().getRequestDispatcher(VUE)
.forward(request, response);
}
public void doPost(HttpServletRequest request, HttpServletResponse
response)
throws ServletException, IOException {
ConnexionForm form = new ConnexionForm();
String chemin = (String) request.getAttribute("chemin");
Utilisateur utilisateur = form.connecterUtilisateur(request);
HttpSession session = request.getSession();
if (form.getErreurs().isEmpty()) {
session.setAttribute(ATT_USER, utilisateur);
if (chemin == null || chemin.startsWith("/connexion"))
response.sendRedirect("/projetForum/forum");
else
response.sendRedirect("/projetForum" + chemin);
} else {
request.setAttribute(ATT_USER, null);
request.setAttribute(ATT_FORM, form);
this.getServletContext().getRequestDispatcher(VUE)
.forward(request, response);
}
}
}
some tags of web.xml
<servlet>
<servlet-name>Connexion</servlet-name>
<servlet-class>com.forum.servlets.Connexion</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>Connexion</servlet-name>
<url-pattern>/connexion</url-pattern>
</servlet-mapping>
<filter>
<filter-name>RestrictionFilter</filter-name>
<filter-class>com.forum.filters.RestrictionFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>RestrictionFilter</filter-name>
<servlet-name>Nouveau</servlet-name>
<servlet-name>Profil</servlet-name>
<servlet-name>Editer</servlet-name>
<servlet-name>Repondre</servlet-name>
</filter-mapping>