upload file using inputstream in GAE java

I am trying to upload file to google sites and am obtaining the stream using apache commons file upload. I get the input stream as under

    InputStream is = fileItem.openStream();  

How will I convert this input stream in file object so that below call succeeds and I am able to set the MediaFileSource to above conv开发者_高级运维erted file.

AttachmentEntry newAttachment = new AttachmentEntry();
newAttachment.setMediaSource(new MediaFileSource(file, fileMimeType));

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You could use MediaStreamSource instead of MediaFileSource.

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You have no write access to a file system on AppEngine and you're supposed to keep your data in datastore. However, gaefs project gives you a virtual file system and, as to the best pf my knowledge, supports file uploading.