How to generate reports dynamically using ireports tool in a web application?

Hi all, As part of my web application , i need to generate reports dynamically using ireport tool.. i have installed the tool and its working fine. I have done some sample reports by passing query statically, but i need to generate it dynamically, I mean i have to pass from_ date and to_date from a jsp/servlet. how it possible , would any body suggest me,how to do it with some sample code snippet.

Thanks in advance