How can I get MIME type of an InputStream of a file that is being uploaded?

Question

Simple question: how can I get MIME type (or content type) of an InputStream, without saving file, for a file that a user is uploading to my servlet?

Answer 1

You can check the Content-Type header field and have a look at the extension of the filename used. For everything else, you have to run more complex routines, like checking by Tikaetc.