Creating Microsoft Office files on Google App Engine « Stephen Huey - 0 views
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GaeVFS ships with a servlet that handles file uploads and abstracts how it writes them to its virtual file system.
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GaeVFS is built on top of Apache Commons VFS, and you use their FileObject instead of the standard File class. There are some examples on the GaeVFS wiki, but I had to play around for a bit before I figured out some of the differences I needed to know.