access password protected system using java code

I need to write a java program in which i need to access a computer in my network using IP address but system is password protected.so how can i access a password protected system to fetch a file from specified location and use store in my system?


I got a code from google but its not working...Pleas e help!

import java.io.Buffere dReader;
import java.io.File;
import java.io.InputSt reamReader;
import java.net.Authen ticator;
import java.net.InetAd dress;
import java.net.Passwo rdAuthenticatio n;
import java.net.URL;

public class Main {
public static void main(String[] argv) throws Exception {
Authenticator.s etDefault(new MyAuthenticator ());
URL url = new URL("http://10.201.74.231:8 0/C:\\test\\abc.d oc");
BufferedReader in = new BufferedReader( new InputStreamRead er(url.openStre am()));
String str;
while ((str = in.readLine()) != null) {
System.out.prin tln(str);
}
in.close();
}
}

class MyAuthenticator extends Authenticator {
protected PasswordAuthent ication getPasswordAuth entication() {
String promptString = getRequestingPr ompt();
System.out.prin tln(promptStrin g);
String hostname = getRequestingHo st();
System.out.prin tln(hostname);
InetAddress ipaddr = getRequestingSi te();
System.out.prin tln(ipaddr);
int port = getRequestingPo rt();

String username = "priyanka";
String password = "wipro_123" ;
return new PasswordAuthent ication(usernam e, password.toChar Array());
}
}