I'm writing a web service with restlet which involved file uploading and downloading. Downloading is simple enough, but file uploading seemed to be a more confusing topic.

Using HTTP POST and files represented by a form field, there are lots of ways to handle file uploads. Restlet includes the Apache FileUpload library, and I even read about using the MimePull library from Glassfish to achieve a streaming upload so you can process the files without having huge temp files.