Your client can set the end-point in the service “port” at runtime via the BindingProvider interface.
Consider the JAX-WS client in this JAX-WS tutorial. Another way to write this code would be:
HelloService service = new HelloService();
Hello port = service.getHelloPort();
BindingProvider bindingProvider = (BindingProvider) port;
bindingProvider.getRequestContext().put(
BindingProvider.ENDPOINT_ADDRESS_PROPERTY,
"http://foo:8086/HelloWhatever");
String response = port.sayHello(name);
Caveat: I haven’t downloaded the tutorial code and tested this code against it.