Download any type of files from JSP/Servlet

Hi,
I understood that if I want to download a file from a JSP or a Servlet I have to set the content type to the MIME type of the file itself.
And then I have to set the Content-Disposition to "attachment; filename=\"" + file_name + "\";" if I want the Open/Save window displaied by the browser (otherise the "inline;...").
How can I download a file if I don't know its MIME type? Am I suppose to use the "application/octet-stream" MIMETYPE?
Where can I find documentation and sample code for doing it?
Are there any free packages available to do so?
Thank you very much

Look at http://www.javaworld.com/javaworld/javatips/jw-javatip94.html for the basic method. This article also refers to the RFCs on MIME types which should answer your questions on what type to use for unknown or binary data.

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Download any type of files from JSP/Servlet

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