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.
It's possible. Just use the classes in the java.util.zip package. You can use the FormFile's getInputStream() method to get an input stream for the file and use it to create in instance of java.util.zip.ZipInputStream.