This week's giveaway is in the EJB and other Java EE Technologies forum. We're giving away four copies of EJB 3 in Action and have Debu Panda, Reza Rahman, Ryan Cuprak, and Michael Remijan on-line! See this thread for details.
Surely that wasn't the best link you could come up with? I used the Google keywords "crystal reports parameters jsp" and it didn't take me long to find a link to a wiki -- from SAP no less -- which appears to have an entry which exactly answers your question. We even have an FAQ page called SearchFirst -- you should check that out. Oh yes, the link? Crystal Reports Java SDK Samples.