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Apache Commons FileUpload
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"The Commons FileUpload package makes it easy to add robust, high-performance,
file upload capability to your servlets and web applications.

FileUpload parses HTTP requests which conform to RFC 1867, "Form-based File 
Upload in HTML". That is, if an HTTP request is submitted using the POST 
method, and with a content type of "multipart/form-data", then FileUpload can 
parse that request, and make the results available in a manner easily used by 
the caller."

For more information:
http://commons.apache.org/fileupload/