Yes, I am doing the exact thing where we are migrating from Crystal to JasperReporting.
Integration is actually pretty easy, You need an API call in your ABL code to JasperServer to download any PDF files created in JasperStudio, If you have used Crystal then its very similar.
Once you have PDF downloaded locally, you can play with it any way you want. I am stuck with printing that PDF with some onscreen parameters as you can find from my post here. Hopefully I can help you with that more later.