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.
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.