Java Programming

Hi,
I have downloaded the strutscx sample application and helped me lot in generting a PDF report and quite comfortable with that.
But we have webapplication where in we dynmically need to generate a PDF report. But the data is really huge. So I have decided to write a offline to generate many PDF reports and save it to a file system. In the (struts)webapplication when I click on that link I will read that pdf file and display/open in browser. So basically I need to have all the .pdf files in the filesystem.

Can somebody help me as to how to create and save a pdf file into filesystem using fop. Please help as this is really urgent for me.
A sample code would be really helpfull for me.
Kindly do the needfull.