Get the listing of everyone logged on
import java.applet.Applet;
import java.awt.Button;
import java.awt.Font;
import java.awt.Frame;
import java.awt.TextArea;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.Socket;
public class Who {
public static void main(String []v){
Socket s = null;
PrintWriter out = null;
BufferedReader in = null;
try {
// Connect to port 79 (the standard finger port) on the host.
String hostname = "www.java2s.com";
s = new Socket(hostname, 79);
// Set up the streams
out = new PrintWriter(new OutputStreamWriter(s.getOutputStream()));
in = new BufferedReader(new InputStreamReader(s.getInputStream()));
// Send a blank line to the finger server, telling it that we want
// a listing of everyone logged on instead of information about an
// individual user.
out.print("\n");
out.flush(); // Send it out
// Now read the server's response
// The server should send lines terminated with \n or \r.
String line;
while ((line = in.readLine()) != null) {
System.out.println(line);
}
System.out.println("Who's Logged On: " + hostname);
} catch (IOException e) {
System.out.println("Who's Logged On: Error");
}
// Close the streams!
finally {
try {
in.close();
out.close();
s.close();
} catch (Exception e) {
}
}
}
}
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