This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
PS: If you're working with a binary Excel file, you'll probably need to stream the data to the browser using a servlet (JSPs don't do this well). In our CodeBarn there is a servlet example called SimpleStream that shows how to do this.