RestrictionAcces.java

package Filter;

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;

/**
 *
 * @author ragotalexis
 */
public class RestrictionAcces implements Filter {
    
    private static final String SESSION_NAME = "connexion";
    private static final String PAGE_CONNECTION = "/Connexion.jsp";

    public RestrictionAcces() {
    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response,
            FilterChain chain)
            throws IOException, ServletException {

        HttpServletRequest req = (HttpServletRequest) request;
        HttpServletResponse resp = (HttpServletResponse) response;
        HttpSession session = req.getSession();

        if (session.getAttribute(this.SESSION_NAME) == null) {
            /* Redirection vers la page de connexion */
            req.getRequestDispatcher(PAGE_CONNECTION).forward( req, resp );
        } else {
            /* Affichage de la page restreinte */
            chain.doFilter(request, response);
        }

    }

    @Override
    public void destroy() {
    }

    @Override
    public void init(FilterConfig filterConfig) {

    }

    @Override
    public String toString() {
        return "Nom de session : " + SESSION_NAME + "Page de connexion : " + PAGE_CONNECTION;
    }
}