This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
As suggested by earlier posts, you can use POST method which will submit all the parameters on your form without passing it in URL. But make sure you have the appropriate method implemented in you servlet (doPost()). Hope this helps!