String host = "localhost";
if (args.length > 0) {
host = args[0];
}
try {
InetAddress theAddress = InetAddress.getByName(host);
boolean[] ports = new boolean[65536];
for (int i = 1; i < 65536; i++) {
try {
Socket theSocket = new Socket(host, i);
System.out.println("There is a server on port " + i + " of " + host);
theSocket.close();
}
catch (ConnectException e) {
// must not be a server on this port
}
catch (IOException e) {
// unexpected error
}
} // end for
for (int i = 1; i < 65536; i++) {
if (ports[i]) {
System.out.println("There is a server on port " + i + " of " + host);
theSocket.close();
}
catch (ConnectException e) {
// must not be a server on this port
}
catch (IOException e) {
// unexpected error
}
} // end for
} // end try
catch (UnknownHostException e) {
System.err.println(e);
}
