how to take full url from portlet

[mcolak]

I write a portlet but when I want to get query string I must give huge query string too for example I want to take "kat"'s query strings value I must put the other query string

http://localhost:8080/portal/portal/default/default/HelloWorldPortletWindow?action=e&kat=deneme&windowstate=normal&mode=view

how I can take all the link ? If I take the full url I can parse it