String host = "localhost";
if (args.length > 0) {
host = args[0];
}
for (int i = 1; i < 1024; i++) {
try {
Socket s = new Socket(host, i);
System.out.println(
"There is a server on port " + i + " of " + host);
}
catch (UnknownHostException e) {
System.err.println(e);
break;
}
catch (IOException e) {
// must not be a server on this port
}
} // end for
