This week's book giveaway is in the OCMJEA forum. We're giving away four copies of OCM Java EE 6 Enterprise Architect Exam Guide and have Paul Allen & Joseph Bambara 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.