Add SOAP Header to Java Webservice

Question

I have created and deploy a very simple test webservice on my server.

public class HelloWorld {

    @WebMethod()
    public String sayHello(String name) {
        System.out.println("Hello: " + name);
        return "Hello " + name + "!";
    }
}

next, i created a test client via File > New > Other > Web Services > Web Service Client. Fill the wsdl address, and eclipse do generate several classes automatically:

- HelloWorld.java
- HelloWorldProxy.java
- HelloWorldService.java
- HelloWorldServiceLocator.java
- HelloWorldServiceSoapBindingStub.java

then code the test client:

HelloWorldProxy wsHelloProxy = new HelloWorldProxy();
String greeting = wsHelloProxy.sayHello('Jack');
System.out.println(greeting) 

it is running succesfully.

My Question is, how can i add additional headers in my client code, because i want to always send some information to my webservice. May i get the example ?

Can anyone help?

thx