curl -X POST -F 'phrase=hi there' http://example.com/test

@Override
public void doPost(HttpServletRequest req, HttpServletResponse resp)
        throws ServletException, IOException
{
    if (req.getParameterMap() != null &&
       !req.getParameterMap().isEmpty())
    {
        // nope.
    }

    if (req.getInputStream() != null) {
        // yep.
    }
}

--------------------------636cc0f5704135cf
Content-Disposition: form-data; name="phrase"

hi there
--------------------------636cc0f5704135cf--