About redirect page

[滕训华]

import java.io.IOException;
 
import org.apache.tapestry.services.Request;
import org.apache.tapestry.services.Response;
 
public class AccessController implements Dispatcher {
        public boolean dispatch(Request request, Response response) throws
IOException {
                boolean canAccess = false;
                
                /*
                 * Access control logic goes here. If the user is allowed to
access the
                 * resource, canAccess should be set to true.
                 */
                
                if(!canAccess) {
                        /*
                         * This is an unauthorized request, so throw an
exception. We'll need
                         * more grace than this, such as a customized
exception page and/or
                         * redirection to a login page...
                         */
                        throw new RuntimeException("Access violation!");
                }
                
                return false;
        }
}

 

 

I learn the dispatcher from wiki page of tapestry and I notice the sentence:

 

This is an unauthorized request, so throw an exception. We'll need
                         * more grace than this, such as a customized
exception page and/or
                         * redirection to a login page...

 

 

But how to redirect a friendly page (exception page or login page)?