Java Filter URL pattern specific to request params

Question

We have a situation where we want to use filter for URL\'s containing some specific request parameters, e.g:

http://mydomain.com/?id=78&formtype=simple_form&.....         


        

Answer 1

You must parse the URL params in the body of the filter, not in web.xml;

I made such a thing, but I used a phase listener, a configuration entry (in a configuration file) that mapped URL params to FQN of classes that handle a particular "action" (by action I mean a URL param from a GET/POST); than, the phase listener would parse all the URL params from each GET/POST and send each of them to a Dispatcher. The Dispatcher's job is to call the right handler (singleton object corresponding to the FQN for that URL param). The handler then just does the specific thing with the URL value he receives.

The same thing can be made by using a filter instead of phase listener.