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Home ► Lab Exercise ► Network Lab Exercise Programs► Java Program For Message Passing Using Message window▼
Java program For Message Passing Using Message window: |
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import java.awt.*;
import java.awt.event.*;
import java.net.*;
import java.io.*;
public class MessageWindow extends Frame
implements ActionListener, Runnable
{
public MessageWindow()
{
try
{
socket = new DatagramSocket();
Integer port = new Integer(socket.getLocalPort());
setTitle("Messenger (local port="+port.intValue()+")");
}
catch (Exception err)
{
Dialog derr = new ErrorDialog(this, err);
derr.show();
derr.dispose();
}
addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e){ System.exit(0); }
});
setSize(600,300);
setBackground(Color.lightGray);
setLayout(new BorderLayout());
Panel p = new Panel(new FlowLayout(FlowLayout.CENTER));
p.add(new Label("Host name:", Label.RIGHT));
p.add(hostname);
p.add(new Label("Port:", Label.RIGHT));
p.add(portnum);
Button b = new Button("Send!");
b.addActionListener(this);
p.add(b);
add(p, "North");
add(msg);
Thread t = new Thread(this);
t.start();
}
public void actionPerformed(ActionEvent event)
{
if ( event.getActionCommand().equals("Send!") )
try
{
byte[] data = msg.getText().getBytes();
InetAddress addr = InetAddress.getByName(hostname.getText());
Integer port = new Integer(portnum.getText());
DatagramPacket pckt = new DatagramPacket(data, data.length, addr, port.intValue());
socket.send(pckt);
}
catch (Exception err)
{
Dialog derr = new ErrorDialog(this, err);
derr.show();
derr.dispose();
}
}
public void run()
{
try
{
while (true)
{
byte[] data = new byte[2048];
DatagramPacket pckt = new DatagramPacket(data, data.length);
socket.receive(pckt);
Message m = new Message(socket, pckt);
m.show();
}
}
catch (Exception err)
{
Dialog derr = new ErrorDialog(this, err);
derr.show();
derr.dispose();
}
}
public static void main(String[] arg)
{
MessageWindow mw = new MessageWindow();
mw.show();
}
private DatagramSocket socket;
private TextArea msg = new TextArea();
private TextField hostname = new TextField(10);
private TextField portnum = new TextField(4);
}
class Message extends Frame
implements ActionListener
{
public Message(DatagramSocket sock, DatagramPacket pckt)
{
socket = sock;
packet = pckt;
try
{
String hostname = pckt.getAddress().getHostName();
String addr = pckt.getAddress().getHostAddress();
Integer port = new Integer(pckt.getPort());
setTitle("Message from "+hostname+"("+addr+":"+port.intValue()+")");
}
catch (Exception err)
{
Dialog derr = new ErrorDialog(this, err);
derr.show();
derr.dispose();
}
addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e){ System.exit(0); }
});
setSize(250,200);
setBackground(new Color(225,225,225));
setLayout(new BorderLayout());
add(new Label("Edit message and press 'Reply!'"), "North");
String data = new String(pckt.getData());
msg.setText(data);
add(msg, "Center");
Panel p = new Panel(new FlowLayout(FlowLayout.CENTER));
Button b = new Button("Reply!");
b.addActionListener(this);
p.add(b);
b = new Button("Close");
b.addActionListener(this);
p.add(b);
add(p, "South");
}
public void actionPerformed(ActionEvent event)
{
if ( event.getActionCommand().equals("Reply!") )
{
try
{
packet.setData(msg.getText().getBytes());
socket.send(packet);
}
catch (Exception err)
{
Dialog derr = new ErrorDialog(this, err);
derr.show();
derr.dispose();
}
}
dispose();
}
private DatagramPacket packet;
private DatagramSocket socket;
private TextArea msg = new TextArea();
}
SAMPLE INPUT OUTPUT: send the message
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