Chat | Chat.java

/*
 * Created on 2004-02-03
 */
package main;

import window.*;
import java.net.*;
import javax.swing.*;

/**
 * @author Robert Rybiański
 * @version 0.0
 */
public class Chat {

  public static String name;
  public static InetAddress host;
  public static int clientPort = 55555;
  public static int serverPort = 44444;
  public static int bufferSize = 99999;
  public static DatagramSocket dsIn, dsOut;
  public static byte bufferIn[] = new byte[bufferSize];
  public static byte bufferOut[] = new byte[bufferSize];
  private static SwingWindow sw;
  public static boolean stopReceive;

  public static void main(String[] args) {
    sw = new SwingWindow("Chat v0.0 - 2004 by Robert Rybiański");
    try {
      name = InetAddress.getLocalHost().toString();
      if (args.length == 1) {
        host = InetAddress.getByName(args[0]);
      } else {
        host = InetAddress.getLocalHost();
      }
      sw.setTextField(host.toString());
      dsIn = new DatagramSocket(clientPort);
      dsOut = new DatagramSocket(serverPort);
      receiveMessage();
    } catch (Exception e) {
      JOptionPane.showMessageDialog(null, "Problems with a connection!", "Error", JOptionPane.ERROR_MESSAGE);
      System.out.println(e);
    }
  }

  public static void receiveMessage() {
    try {
      while (true) {
        DatagramPacket p = new DatagramPacket(bufferIn, bufferIn.length);
        dsIn.receive(p);
        while (stopReceive);
        sw.setMessage(new String(p.getData(), 0, p.getLength()));
      }
    } catch (Exception e) {
      JOptionPane.showMessageDialog(null, "Impossible to receive a message!", "Error", JOptionPane.ERROR_MESSAGE);
      System.out.println(e);
    }
    finally {
      receiveMessage();
    }
  }

  public static boolean sendMessage(String str) {
    int pos = 0;

    while (pos < str.length() && pos < bufferSize) {
      bufferOut[pos] = (byte) str.charAt(pos);
      pos++;
    }

    try {
      String string = sw.getTextField();
      if (string.indexOf("/") >= 0) {
        host = InetAddress.getByName(string.substring(0, string.indexOf("/")));
      } else {
        host = InetAddress.getByName(string);
      }
      dsOut.send(new DatagramPacket(bufferOut, pos, host, clientPort));
    } catch (Exception e) {
      JOptionPane.showMessageDialog(null, "The incorrect host (domain / IP)!", "Error", JOptionPane.ERROR_MESSAGE);
      System.out.println(e);

      return false;
    }

    return true;
  }
}