1: import javax.swing.*;

   2: import java.awt.*;

   3: import java.io.*;

   4: import javax.swing.border.*;

   5: import java.net.*;

   6: import java.awt.event.*;

   7:  

   8: class Server extends JFrame implements ActionListener

   9: {

  10:     private JTextArea jtaSend=new JTextArea();

  11:     private JTextArea jtaReceive=new JTextArea();

  12:     private JButton jbtSend=new JButton("Send");

  13:     

  14:     DataOutputStream output;

  15:     DataInputStream input;

  16:     

  17:     public Server()

  18:     {

  19:         jbtSend.addActionListener(this);

  20:     

  21:         try

  22:         {

  23:             ServerSocket server=new ServerSocket(8000);

  24:             Socket socket=server.accept();//wait connection from a client

  25:             System.out.println("connected to a client");

  26:         

  27:             output=new DataOutputStream(socket.getOutputStream());

  28:             input=new DataInputStream(socket.getInputStream());

  29:         

  30:             getContentPane().setLayout(new GridLayout(2,1));

  31:             JScrollPane scp=new JScrollPane(jtaSend);

  32:             scp.setBorder(new TitledBorder("Type your message here"));

  33:         

  34:             JPanel panel=new JPanel();

  35:             panel.setLayout(new BorderLayout());

  36:             panel.add(scp,BorderLayout.CENTER);

  37:             panel.add(jbtSend,BorderLayout.SOUTH);

  38:             getContentPane().add(panel);    

  39:         

  40:             getContentPane().add(new JScrollPane(jtaReceive));

  41:             setTitle("Server");

  42:             setSize(300,300);

  43:         

  44:             setLocation(20,30);

  45:             setVisible(true);

  46:         

  47:             while(true)

  48:             {

  49:                 jtaReceive.setText(input.readUTF());

  50:             }

  51:         }

  52:         catch(IOException ex)

  53:         {

  54:             ex.printStackTrace();

  55:         }

  56:     }

  57:  

  58:     public static void main(String[]args)

  59:     {

  60:         JFrame frame=new Server();

  61:     }

  62:  

  63:     public void actionPerformed(ActionEvent e)

  64:     {

  65:         try

  66:         {

  67:             output.writeUTF(jtaSend.getText());

  68:         }

  69:         catch(Exception ex)

  70:         {

  71:         }

  72:     }

  73: }