/* * Listen on the specified address and port. Return a listener * that encapsulates the ServerSocket. */ ListenKey startListening(String localaddress, int port) throws IOException { InetSocketAddress sa; if (localaddress == null) { sa = new InetSocketAddress(port); } else { sa = new InetSocketAddress(localaddress, port); } ServerSocket ss = new ServerSocket(); ss.bind(sa); return new SocketListenKey(ss); }