使用轴调用Web服务中的SOAPACTION_URI_PROPERTY

我想用axis调用web服务。我想使用这个代码。有人能告诉我Call.SOAPACTION_URI_PROPERTY的值应该是什么吗?

代码:

         try {

        String endpoint =  "http://www.w3schools.com/webservices/tempconvert.asmx";

        Service  service = new Service();
        Call call= (Call) service.createCall();

        call.setProperty( Call.SOAPACTION_USE_PROPERTY, new Boolean( true ) );
        call.setProperty( Call.SOAPACTION_URI_PROPERTY, "http://tempuri.org/CelsiusToFahrenheit");

        call.setTargetEndpointAddress( new java.net.URL(endpoint) );
        call.setOperationName(new QName("http://tempuri.org/CelsiusToFahrenheit","CelsiusToFahrenheit"));

        String ret = (String) call.invoke( new Object[] {"20"} );
        System.out.println("Sent '20', got '" + ret + "'");

 } catch (Exception e) {
        System.err.println(e.toString());
}