Redirection using a Listener

[vishwanath nadimpally]

Hi folks,
I am working on a small application and I am trying to figure out a correct way of handling a situation.

The requirement is when ever a jsp or web resource tries to access resources underneath a particular directory the request is redirected to a new URL which is entirely different and on a different server where the user is authenticated first.Some thing like a filter.

Say for example some code like this

request.getRequestDispatcher("/abc/xyz.jsp").forward(request, response);

in a jsp, and the request should be redirected to a page on a new server where the user is authenticated and then redirected to xyz.jsp.

I was thinking of a Listener where I could start the listener once the server starts and when ever there's some code like

request.getRequestDispatcher("/abc/xyz.jsp").forward(request, response);

the listener intercepts the request and forwards the request to a servlet where I build my URL and redirect the request.


Is it possible to do something like this? or is there something wrong with this implementation.Are there any easier solutions to this problem.

Now, I have never written Listener code before and this is a genuine question. So it might sound like a stupid question.

[Saritha Penumudi]

I think you can use ServletRequestListener to do this task. But I am not sure if this will be a good approach.
Or else you can use filters to do same.

I also want to know the best approach to do this.

[dema rogatkin]

I think using filters is more appropriate approach. Listeners are something acting as passive components not changing a normal flow.

[nandkishor rao]

can't you use a sendRedirect()method to forward the request to another app. server?Or do you also want to hold the previous request and response objects state also?