How to change the service URL at runtime?

[KARR, DAVID (ATTSI)]

I've generated classes from my wsdl, but the service URL specified in
the WSDL is just a placeholder, at least the host:port.  I'll need to
specify a real value for that at runtime.  How do I change this at
runtime?  I can't find any mention of this in the docs.  The closest I
can find in the generated code is the "addPort()" method in the
generated service class.  This has a "endpointAddress" parameter.  I
hope I don't have to call this for every port instance.