www.pudn.com > jnp-src.rar > Chatboard.java

/*
 * Java Network Programming, Second Edition
 * Merlin Hughes, Michael Shoffner, Derek Hamner
 * Manning Publications Company; ISBN 188477749X
 *
 * http://nitric.com/jnp/
 *
 * Copyright (c) 1997-1999 Merlin Hughes, Michael Shoffner, Derek Hamner;
 * all rights reserved; see license.txt for details.
 */

import java.io.*; 
import java.awt.*; 
import java.awt.event.*; 
 
public class Chatboard extends Panel implements Runnable, ActionListener { 
  protected TextArea output; 
  protected TextField input; 
  protected Queue queue; 
  protected Thread listener; 
   
  public Chatboard () { 
    setLayout (new BorderLayout ()); 
    add ("Center", output = new TextArea ()); 
    output.setEditable (false); 
    add ("South", input = new TextField ()); 
    input.addActionListener (this); 
    queue = new Queue (); 
    listener = new Thread (this); 
    listener.start (); 
  } 
 
  public Dimension getPreferredSize () { 
    return new Dimension (200, 150); 
  } 
 
  protected MessageOutput messageOut; 
   
  public void setMessageOutput (MessageOutput messageOut) { 
    this.messageOut = messageOut; 
  } 
 
  public MessageOutput getMessageOutput () { 
    return new QueueOutputStream (queue); 
  } 
 
  public void actionPerformed (ActionEvent event) { 
    try { 
      messageOut.writeUTF (input.getText ()); 
      messageOut.send (); 
      output.append (input.getText () + "\n"); 
      input.setText (""); 
    } catch (IOException ignored) { 
    } 
  } 
 
  public void run () { 
    QueueInputStream queueIn = new QueueInputStream (queue); 
    try { 
      while (!Thread.interrupted ()) { 
        queueIn.receive (); 
        String msg = queueIn.readUTF (); 
        output.append ("-- " + msg + "\n"); 
      } 
    } catch (IOException ignored) { 
    } 
  } 
}