Have a look at the docs for the struts iterate tag (http://struts.apache.org/1.2.x/userGuide/struts-logic.html#iterate
), paying particular attention to the offset and length attributes.
Lets say you want 10 records per page - set offset to pageNumber * 10 (Assuming that, internally, pageNumber is zero based) and length to 10. Then provide some mechanism for displaying next/previous/specific page links which post the appropriate value back to the action.
I hope this brief description makes sense to you, as I don't have time to provide code samples right now.
Let me know if you need more help.