Can you store this image as a clob or blob in your database? Depending on the size of your application, you'll see performance degradation once you get over 10-20K items in a single directory. Storing them in a database will also mean you are not tied to a single machine as your application grows.
Finally, uploading user files to a server directory is one of the most common attack vectors. If you do so, make sure they are not given executable permissions and validate that they are truly images before saving them to disk.
Sincerely,
Joseph
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