I see. Most web service toolkits (like Axis or JAX-WS) include a tool that generates Java client code from a WSDL. It might be called wsdl2java or some such; check the documentation of the toolkit you're using.
Once you have the code to access the WS, you can examine which parameters it needs, and construct an HTML form that submits those to a
servlet. That in turn can use the previously generated client code to access the WS.
I'm not aware of a tool that generates HTML forms directly from a WSDL.
[ January 21, 2008: Message edited by: Ulf Dittmer ]