Finger.java Source code

Introduction

Here is the source code for Finger.java

Source

/*       
Chapter 3 - Simple Protocols
Java 2 Network Protocols Black Book
by Al Williams     
Paraglyph Press 2001
*/

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

public class Finger {
    public String finger(String host, String users) throws IOException, SocketException {
        String outstring = "";
        int c = 0;
        Socket sock = new Socket(host, 79);
        OutputStream os = sock.getOutputStream();
        InputStream is = sock.getInputStream();
        users = users + "\r\n";
        os.write(users.getBytes("iso8859_1"));
        try {
            while (c != -1) {
                c = is.read();
                if (c != -1)
                    outstring += (char) c;
            }
        } catch (IOException e) {
        }
        return outstring;
    }

    public static void main(String[] args) {

        String hostname = "";
        String ulist = "";
        if (args.length == 0) {
            System.out.println("usage: finger host [user]");
            System.exit(1);
        }
        if (args.length >= 2)
            for (int i = 1; i < args.length; i++)
                ulist += args[i] + " ";
        hostname = args[0];
        Finger worker = new Finger();
        try {
            System.out.println(worker.finger(hostname, ulist.trim()));
        } catch (Exception e) {
            System.out.println(e);
        }
    }
}