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.
"Multiple file upload" in that the user can select a fixed number of files, or that the user can select any number of files? In the first case where you the user can select a fixed number of files you just need to put multiple FormFile properties in your form. I recall doing some research into the second case and it is not supported. As I recall, some browsers will let the user select multiple files but it is not really a supported feature and not something supported by Struts.