Checking for a Valid Path when Uploading a File Using commons-fileupload

I'm working with some code that uploads an image from a form and stores it on our server. In Internet Explorer the user can enter a path manually, and I wonder how I can check that the file exists, i.e., that the user entered a valid path. There's a FileItem object that's being used to check size (e.g., fileItem.getSize() < MAX_SIZE), and I wonder if a good approach would be to use size to check that the file exists. For example: if (fileItem.getSize() == 0) { // Somethings wrong -- invalid path. } else { // File exists -- valid path. } Any suggestions are appreciated. Thanks!
I think you don't even get a FileItem when there is nothing uploaded.

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