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Displaying  Source Code(s)  
 

 
A Simple Client-Server Multicasting

--------------------------------------------------------------------------------

Description : NetConference Implementing 1-2-M Conference, Means One Server Responds to Many Clients. It Provides users about Basic Info about Netconference, Multicasting aswell as Multitherading in Java.

Code :

/*
Client Setting

NetConference.
______________

*/

/* Tips to run this :
__________________

(After compiling chatkaro12mserver.java)

Step1: Open another prompt and run java chatkaro12mclient 127.0.0.1.
___________________________________


*/


/*

Server Setting

** NetConference**
__________________

*/

/* Tips to run this:
__________________


Step1: Open command prompt and run java chatkaro12mserver.
______________________

Step2: Continue with client program.


*/


//Code: chatkaro12mserver.java
// Program Starts...


import java.io.*;
import java.net.*;
import java.util.Vector;
import java.util.Enumeration;
public class chatkaro12mServer
{
//static String k=socket.getInetAddress().getHostName();
private int port=5001;
private boolean li=true;
private Vector clients=new Vector();
public static void main(String a[])
{
System.out.println(" Press ctrl-c to Quit.");
new chatkaro12mServer().server();
}
void server()
{
ServerSocket serverSock=null;
try
{
InetAddress serverAddr=InetAddress.getByName(null);
System.out.println("Waiting for"+serverAddr.getHostName()+"on
port"+port);
serverSock=new ServerSocket(port,50);
}
catch(IOException e)
{
System.out.println(e.getMessage()+":Failed");
return;
}
while(li)
{
try
{
Socket socket=serverSock.accept();
System.out.println("Accept <BR>+socket.getInetAddress().getHostName());
DataOutputStream remoteOut= new
DataOutputStream(socket.getOutputStream());
clients.addElement(remoteOut);
new ServerHelper(socket,remoteOut,this).start();
}
catch(IOException e)
{
System.out.println(e.getMessage()+":Failed");
}
}
if(serverSock !=null)
{
try
{
serverSock.close();
}
catch(IOException x)
{
}
}
}
synchronized Vector getClients()
{
return clients;
}
synchronized void removeFromClients(DataOutputStream remoteOut)
{
clients.removeElement(remoteOut);
}
}
class ServerHelper extends Thread
{
private Socket sock;
private DataOutputStream remoteOut;
private chatkaro12mServer server;
private boolean li=true;
private DataInputStream remoteIn;
ServerHelper(Socket sock,DataOutputStream remoteOut,chatkaro12mServer
server) throws IOException
{
this.sock=sock;
this.remoteOut=remoteOut;
this.server=server;
remoteIn=new DataInputStream(sock.getInputStream());
}
public synchronized void run()
{
String s;
try
{
while(li)
{
s=remoteIn.readUTF();
broadcast(s);
}
}
catch(IOException e)
{
System.out.println(e.getMessage()+"connection lost");
}
finally
{
try
{
cleanUp();
}
catch (IOException x)
{
}
}
}
private void broadcast(String s)
{
Vector clients=server.getClients();
DataOutputStream dataOut=null;
for(Enumeration e=clients.elements();
e.hasMoreElements(); )
{
dataOut=(DataOutputStream)(e.nextElement());
if(!dataOut.equals(remoteOut))
{
try
{
dataOut.writeUTF(s);
}
catch(IOException x)
{
System.out.println(x.getMessage()+"Failed");
server.removeFromClients(dataOut);
}

}
}
}

private void cleanUp() throws IOException
{
if(remoteOut!=null)
{
server.removeFromClients(remoteOut);
remoteOut.close();
remoteOut=null;
}

if(remoteIn!=null)
{
remoteIn.close();
remoteIn=null;
}

if(sock!=null)
{
sock.close();
sock=null;
}
}
protected void finalize() throws Throwable
{
try
{
cleanUp();
}
catch(IOException x)
{
}
super.finalize();
}
}


Code: chatkaro12mclient.java
// Program Starts...

import java.io.*;
import javax.swing.*;
import java.net.*;
import java.awt.*;
import java.awt.event.*;
public class chatkaro12mClient extends Panel
{
TextArea receivedText;
Socket sock;
private GridBagConstraints c;
private GridBagLayout gridBag;
private Frame frame;
private Label label;
JButton send;
JButton exit;
private int port=5001;
private TextArea sendText;
private String hostname;
private String username;
private DataOutputStream remoteOut;
ImageIcon i1,i2;
public static void main(String args[])
{
if(args.length != 2)
{
System.out.println("Format is : java chatkaro12mClient ");
return;
}
Frame f1=new Frame("Welcome Protocol");
f1.resize(800,600);
f1.show();
JOptionPane.showMessageDialog(f1,"Welcome "+args[0]+".. Have a nice
Session.","Welcome",0);
Frame f= new Frame("Connecting to Mr. "+args[0]);
chatkaro12mClient chat=new chatkaro12mClient(f,args[0],args[1]);
f.add("Center",chat);
f.setSize(800,600);
f.show();
chat.client();
}
public chatkaro12mClient(Frame f,String user,String host)
{
frame=f;
frame.addWindowListener(new WindowExitHandler());
username=user;
hostname=host;
//Insets insets=new Insets(10,20,5,10);
//gridBag=new GridBagLayout();
//setLayout(gridBag);
/*c=new GridBagConstraints();
c.insets=insets;
c.gridy=0;
c.gridx=0;*/
label=new Label("Text to send :");
add(label);
/*gridBag.setConstraints(label,c);

c.gridx=1;*/
sendText=new TextArea(15,30);
/*sendText.addActionListener(new TextActionHandler());
gridBag.setConstraints(sendText,c);*/
add(sendText);
//c.gridy=1;
//c.gridx=0;
label= new Label("Text received :");
//gridBag.setConstraints(label,c);
add(label);
//c.gridx=1;
receivedText=new TextArea(15,30);
//gridBag.setConstraints(receivedText,c);
add(receivedText);
ImageIcon i1=new ImageIcon("click.gif");
ImageIcon i2=new ImageIcon("doorin2.gif");
send=new JButton(i1);
exit=new JButton(i2);
add(send);
add(exit);
send.addActionListener(new TextActionHandler());
exit.addActionListener(new EXIT());
}

void client()
{
try
{
if(hostname.equals("local"))
hostname=null;
InetAddress serverAddr= InetAddress.getByName(hostname);
sock=new Socket(serverAddr.getHostName(),port);
remoteOut=new DataOutputStream(sock.getOutputStream());
System.out.println("Connected to server " + serverAddr.getHostName() + <BR>
on port " + sock.getPort());
new chatkaro12mClientReceive(this).start();
}
catch(IOException e)
{
System.out.println(e.getMessage() + " : Failed to connect to
server.");
}
}
protected void finalize() throws Throwable
{
try
{
if(remoteOut != null)
remoteOut.close();
if(sock != null)
sock.close();
}
catch(IOException x)
{}
super.finalize();
}
class WindowExitHandler extends WindowAdapter
{
public void windowClosing(WindowEvent e)
{
Window w=e.getWindow();
w.setVisible(false);
w.dispose();
System.exit(0);
}
}

class EXIT implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
if((JOptionPane.showConfirmDialog(new Frame(),"Are You Sure to close
the Session?"))==JOptionPane.YES_OPTION)
{
JOptionPane.showMessageDialog(new Frame(),"Thank U. Visit Again.<BR>,"Good Bye",0);
System.exit(0);
}

}
}
class TextActionHandler implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
try
{
remoteOut.writeUTF(sendText.getText());
JOptionPane.showMessageDialog(new Frame(),"Your msg has been sent<BR>,"Confirmation",0);
sendText.setText("");
}
catch(IOException x)
{
System.out.println(x.getMessage() + " : connection to peer lost.");
}
}
}
}
class chatkaro12mClientReceive extends Thread
{
private chatkaro12mClient chat;
chatkaro12mClientReceive(chatkaro12mClient chat)
{
this.chat=chat;
}
public synchronized void run()
{
String s;
DataInputStream remoteIn=null;
try
{
remoteIn= new DataInputStream(chat.sock.getInputStream());
while(true)
{
s=remoteIn.readUTF();
chat.receivedText.setText(s);
}
}
catch(IOException e)
{
System.out.println(e.getMessage() + " : connection to peer lost.");
}
finally
{
try
{
if(remoteIn !=null)
remoteIn.close();
}
catch(IOException x)
{}
}
}
}

 

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