...
Properties props = new Properties();
props.add("org.omg.CORBA.ORBInitialHost", httpServletRequest.getParameter("initialHost"));
props.add("org.omg.CORBA.ORBInitialPort", httpServletRequest.getParameter("initialPort"));
ORB orb = ORB.init(null, props);
// do some work with your ORB
...

public void doGet(..) {
    String param1 = request.getParameter("param1");
    String param2 = request.getParameter("param2");
    startCorbaClient(param1, param2);
}

java -Dorb.host=xxx.xx.xx.xxx -Dorb.port=1050 application_server_startup.jar

orbHost = System.getProperty("orb.host");
orbPort = System.getProperty("orb.port");