Where the input element name that corresponds to the form element where the 
file is selected is the request parameter you use on the servlet side.

For instance if the input element name="myFile" then on the servlet side do 
this:

Map<String, BlobKey> blobs = blobstoreService.getUploadedBlobs(request); 
BlobKey blobKey = blobs.get("myFile");

Brandon Donnelson
http://gwt-examples.googlecode.com
http://c.gawkat.com

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