java 调用webService接口怎么搞？

Question

// 看不懂这段代码

Service service = new Service();

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

call.setTargetEndpointAddress(new java.net.URL("http://"));

call.setUseSOAPAction(true);

call.setReturnType(new QName("http://", "string"));

// 第二种设置返回值类型为String的方法

call.setOperationName(new QName("http://", "loginSSO"));

call.setSOAPActionURI("http://");

call.addParameter(new QName("http://", "userId"), XMLType.XSD_STRING, ParameterMode.IN);

call.addParameter(new QName("http://", "token"), XMLType.XSD_STRING, ParameterMode.IN);

String retVal = (String) call.invoke(new Object[] { id, "818B1DA07B0" });

return retVal;