This week's book giveaway is in the Mac OS forum. We're giving away four copies of a choice of "Take Control of Upgrading to Yosemite" or "Take Control of Automating Your Mac" and have Joe Kissell on-line! See this thread for details.
The first place to look is in the struts-examples-1.3.5.war file that comes with the Struts download. Unzip the file and look at the source code. You will find a working example of a file upload there.