用下面的代码可以得到一个socket 动态IP

//Use an unrestricted filter.

String filter = "*";

String url = "socket://:" + m_sSocketPort;

ServerSocketConnection ssc = null;

try

{

     //Open the connection.

     ssc =

        (ServerSocketConnection) Connector.open(url);

     System.out.println("/* Already Open the connection!");

      //Discover the system-assigned port.

     url = "socket://:" + ssc.getLocalPort();

      //Register the connection now. The AMS will

      //remember the registered URL even when the MIDlet

      //is not active.

     PushRegistry.registerConnection(url,

             m_sMidletClassName, filter);

     System.out.println("/* Already Register the connection now!" +

             url);

      //Now publish the push URL. We can use an HTTP

      //POST or a socket or datagram for this.

     String purl;

     purl = "socket://" + ssc.getLocalAddress() +

        ":" + ssc.getLocalPort();

     publishInboundConnection(purl, m_sMidletClassName);

}