Server.java

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package group_chatapp;
import java.util.*;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
public class Server {
    static ServerSocket ss;
    static Socket s;
    static DataInputStream dis;
    static DataOutputStream dout;
    
   public static Vector<Clienthandler> ar= new Vector<>();
    
    public static void main(String args[]) throws IOException, ClassNotFoundException {
        /* Set the Nimbus look and feel */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
         * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(Client_firstpage.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(Client_firstpage.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(Client_firstpage.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(Client_firstpage.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>
        //</editor-fold>
       
        ss=new ServerSocket(1201);
         int i=1;
        while(true)
        {
        s=ss.accept();
        System.out.println("client connected"+i);
         dis=new DataInputStream(s.getInputStream());
         dout= new DataOutputStream(s.getOutputStream());
        String usern=dis.readUTF();
       //  System.out.println(usern);
        Clienthandler c= new Clienthandler(s,dis,dout,usern);
        ar.add(c);
      //  dout.writeObject(ar);
       System.out.println(ar);
        Thread t= new Thread(c);
        t.start();
        i++;
        System.out.println(ar);
        }

        /* Create and display the form */
      
    }
}