Java: Lập trình mạng-tìm kiếm port cho localhost

import java.net.*;
import java.io.*;


public class lookForPorts {

public static void main(String[] args) {

Socket theSocket;
String host = "localhost";

if (args.length > 0) {
host = args[0];
}
for (int i = 0; i < 1024; i++) {
try {
theSocket = 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

} // end main

} // end look for ports