I have an uploader in JSP, and through this I can upload several kinds of file. I need to perform a control (I think with regular expression, just a simple check on file extension) where the JSP engine could read the content of the file and understand if the file is an image or plain text file. I can accept only plain text (text or XML) and discard all the other kind of files. Could someone help me or suggest another way to do that?
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consider an answer like this one... http://stackoverflow.com/questions/567757/how-do-i-distinguish-between-binary-and-text-files – Les Jun 25 '15 at 16:19
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With REGEX, is possible do this control? – Armeice Jun 26 '15 at 14:20
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As a very basic check you could verify the file extension with something like \.txt$, however this doesn't prevent people from uploading different filetypes with a .txt extension. You might be better off by checking the mimetype of the file uploaded, a JSP example can be found here.
