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import java.io.*;

import java.net.*;

import java.util.*;

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

class MyServer

{

ArrayList al=new ArrayList();

ArrayList users=new ArrayList();

ServerSocket ss;

Socket s;

public final static int PORT=10;

public final static String UPDATE_USERS="updateuserslist:";

public final static String LOGOUT_MESSAGE="@@logoutme@@:";

public MyServer()

{

try{

ss=new ServerSocket(PORT);

System.out.println("Server Started "+ss);

while(true)

{

s=ss.accept();

Runnable r=new MyThread(s,al,users);

Thread t=new Thread(r);

t.start();

}

catch(Exception e){System.err.println("Server constructor"+e);}

}

public static void main(String [] args)

{

new MyServer();

}

class MyThread implements Runnable

{

Socket s;

ArrayList al;

ArrayList users;

String username;

MyThread (Socket s, ArrayList al,ArrayList users)

{

this.s=s;

this.al=al;

this.users=users;

try{

DataInputStream dis=new DataInputStream(s.getInputStream());

username=dis.readUTF();

al.add(s);

users.add(username);

tellEveryOne("****** "+ username+" Logged in at "+(new Date())+" ******");

sendNewUserList();

}

catch(Exception e){System.err.println("MyThread constructor "+e);}

}

public void run()

{

String s1;

try{

DataInputStream dis=new DataInputStream(s.getInputStream());

{

s1=dis.readUTF();

if(s1.toLowerCase().equals(MyServer.LOGOUT_MESSAGE)) break;

// System.out.println("received from "+s.getPort());

tellEveryOne(username+" said: "+" : "+s1);

}

while(true);

DataOutputStream tdos=new DataOutputStream(s.getOutputStream());

tdos.writeUTF(MyServer.LOGOUT_MESSAGE);

tdos.flush();

users.remove(username);

tellEveryOne("****** "+username+" Logged out at "+(new Date())+" ******");

sendNewUserList();

al.remove(s);

s.close();

}

catch(Exception e){System.out.println("MyThread Run"+e);}

}

public void sendNewUserList()

{

tellEveryOne(MyServer.UPDATE_USERS+users.toString());

}

public void tellEveryOne(String s1)

{

Iterator i=al.iterator();

while(i.hasNext())

{

try{

Socket temp=(Socket)i.next();

DataOutputStream dos=new DataOutputStream(temp.getOutputStream());

dos.writeUTF(s1);

dos.flush();

//System.out.println("sent to : "+temp.getPort()+" : "+ s1);

}

catch(Exception e){System.err.println("TellEveryOne "+e);}

}

class MyClient implements ActionListener

{

Socket s;

DataInputStream dis;

DataOutputStream dos;

JButton sendButton, logoutButton,loginButton, exitButton;

JFrame chatWindow;

JTextArea txtBroadcast;

JTextArea txtMessage;

JList usersList;

public void displayGUI()

{

chatWindow=new JFrame();

txtBroadcast=new JTextArea(5,30);

txtBroadcast.setEditable(false);

txtMessage=new JTextArea(2,20);

usersList=new JList();

sendButton=new JButton("Send");

logoutButton=new JButton("Exit");

loginButton=new JButton("Enter");

exitButton=new JButton("Leave");

JPanel center1=new JPanel();

center1.setLayout(new BorderLayout());

center1.add(new JLabel("Broad Cast messages from all online users",JLabel.CENTER),"North");

center1.add(new JScrollPane(txtBroadcast),"Center");

JPanel south1=new JPanel();

south1.setLayout(new FlowLayout());

south1.add(new JScrollPane(txtMessage));

south1.add(sendButton);

JPanel south2=new JPanel();

south2.setLayout(new FlowLayout());

south2.add(loginButton);

south2.add(logoutButton);

south2.add(exitButton);

JPanel south=new JPanel();

south.setLayout(new GridLayout(2,1));

south.add(south1);

south.add(south2);

JPanel east=new JPanel();

east.setLayout(new BorderLayout());

east.add(new JLabel("Online Users",JLabel.CENTER),"East");

east.add(new JScrollPane(usersList),"South");

chatWindow.add(east,"East");

chatWindow.add(center1,"Center");

chatWindow.add(south,"South");

chatWindow.pack();

chatWindow.setTitle("Login for Chat");

chatWindow.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);

chatWindow.setVisible(true);

sendButton.addActionListener(this);

logoutButton.addActionListener(this);

loginButton.addActionListener(this);

exitButton.addActionListener(this);

logoutButton.setEnabled(false);

loginButton.setEnabled(true);

txtMessage.addFocusListener(new FocusAdapter()

{public void focusGained(FocusEvent fe){txtMessage.selectAll();}});

chatWindow.addWindowListener(new WindowAdapter()

{

public void windowClosing(WindowEvent ev)

{

if(s!=null)

{

JOptionPane.showMessageDialog(chatWindow,"u r logged out right now. ","Exit",JOptionPane.INFORMATION_MESSAGE);

logoutSession();

}

System.exit(0);

}

});

}

public void actionPerformed(ActionEvent ev)

{

JButton temp=(JButton)ev.getSource();

if(temp==sendButton)

{

if(s==null)

{JOptionPane.showMessageDialog(chatWindow,"You should Enter by telling your name"); return;}

try{

dos.writeUTF(txtMessage.getText());

txtMessage.setText("");

}

catch(Exception excp){txtBroadcast.append("\nsend button click :"+excp);}

}

if(temp==loginButton)

{

String uname=JOptionPane.showInputDialog(chatWindow,"Enter Your lovely nick name: ");

if(uname!=null)

clientChat(uname);

}

if(temp==logoutButton)

{

if(s!=null)

logoutSession();

}

if(temp==exitButton)

{

if(s!=null)

{

JOptionPane.showMessageDialog(chatWindow,"You have Exited right now. ","Exit",JOptionPane.INFORMATION_MESSAGE);

logoutSession();

}

System.exit(0);

}

public void logoutSession()

{

if(s==null) return;

try{

dos.writeUTF(MyServer.LOGOUT_MESSAGE);

Thread.sleep(500);

s=null;

}

catch(Exception e){txtBroadcast.append("\n inside logoutSession Method"+e);}

logoutButton.setEnabled(false);

loginButton.setEnabled(true);

chatWindow.setTitle("Enter for Chat");

}

//////////////////////////

public void clientChat(String uname)

{

try{

s=new Socket(InetAddress.getLocalHost(),MyServer.PORT);

dis=new DataInputStream(s.getInputStream());

dos=new DataOutputStream(s.getOutputStream());

ClientThread ct=new ClientThread(dis,this);

Thread t1=new Thread(ct);

t1.start();

dos.writeUTF(uname);

chatWindow.setTitle(uname+" Chat Window");

}

catch(Exception e){txtBroadcast.append("\nClient Constructor " +e);}

logoutButton.setEnabled(true);

loginButton.setEnabled(false);

}

public MyClient()

{

displayGUI();

// clientChat();

}

public static void main(String []args)

{

new MyClient();

}

class ClientThread implements Runnable

{

DataInputStream dis;

MyClient client;

ClientThread(DataInputStream dis,MyClient client)

{

this.dis=dis;

this.client=client;

}

public void run()

{

String s2="";

{

try{

s2=dis.readUTF();

if(s2.startsWith(MyServer.UPDATE_USERS))

updateUsersList(s2);

else if(s2.equals(MyServer.LOGOUT_MESSAGE))

break;

else

client.txtBroadcast.append("\n"+s2);

int lineOffset=client.txtBroadcast.getLineStartOffset(client.txtBroadcast.getLineCount()-1);

client.txtBroadcast.setCaretPosition(lineOffset);

}

catch(Exception e){client.txtBroadcast.append("\nClientThread run : "+e);}

}

while(true);

}

public void updateUsersList(String ul)

{

Vector ulist=new Vector();

ul=ul.replace("[","");

ul=ul.replace("]","");

ul=ul.replace(MyServer.UPDATE_USERS,"");

StringTokenizer st=new StringTokenizer(ul,",");

while(st.hasMoreTokens())

{

String temp=st.nextToken();

ulist.add(temp);

}

client.usersList.setListData(ulist);

}