GUI client server char

// ServerGUI.Java

import javax.swing.*;

import java.awt.*;

import java.awt.event.*;

/*

* The server as a GUI

*/

public class ServerGUI extends JFrame implements ActionListener, WindowListener {

    

    private static final long serialVersionUID = 1L;

    // the stop and start buttons

    private JButton stopStart;

    // JTextArea for the chat room and the events

    private JTextArea chat, event;

    // The port number

    private JTextField tPortNumber;

    // my server

    private Server server;

    

    

    // server constructor that receive the port to listen to for connection as parameter

    ServerGUI(int port) {

        super("Chat Server");

        server = null;

        // in the NorthPanel the PortNumber the Start and Stop buttons

        JPanel north = new JPanel();

        north.add(new JLabel("Port number: "));

        tPortNumber = new JTextField("  " + port);

        north.add(tPortNumber);

        // to stop or start the server, we start with "Start"

        stopStart = new JButton("Start");

        stopStart.addActionListener(this);

        north.add(stopStart);

        add(north, BorderLayout.NORTH);

        

        // the event and chat room

        JPanel center = new JPanel(new GridLayout(2,1));

        chat = new JTextArea(80,80);

        chat.setEditable(false);

        appendRoom("Chat room.\n");

        center.add(new JScrollPane(chat));

        event = new JTextArea(80,80);

        event.setEditable(false);

        appendEvent("Events log.\n");

        center.add(new JScrollPane(event));

        add(center);

        

        // need to be informed when the user click the close button on the frame

        addWindowListener(this);

        setSize(400, 600);

        setVisible(true);

    }     

    // append message to the two JTextArea

    // position at the end

    void appendRoom(String str) {

        chat.append(str);

        chat.setCaretPosition(chat.getText().length() - 1);

    }

    void appendEvent(String str) {

        event.append(str);

        event.setCaretPosition(chat.getText().length() - 1);

        

    }

    

    // start or stop where clicked

    public void actionPerformed(ActionEvent e) {

        // if running we have to stop

        if(server != null) {

            server.stop();

            server = null;

            tPortNumber.setEditable(true);

            stopStart.setText("Start");

            return;

        }

        // OK start the server

        int port;

        try {

            port = Integer.parseInt(tPortNumber.getText().trim());

        }

        catch(Exception er) {

            appendEvent("Invalid port number");

            return;

        }

        // ceate a new Server

        server = new Server(port, this);

        // and start it as a thread

        new ServerRunning().start();

        stopStart.setText("Stop");

        tPortNumber.setEditable(false);

    }

    

    // entry point to start the Server

    public static void main(String[] arg) {

        // start server default port 1500

        new ServerGUI(1500);

    }

    /*

     * If the user click the X button to close the application

     * I need to close the connection with the server to free the port

     */

    public void windowClosing(WindowEvent e) {

        // if my Server exist

        if(server != null) {

            try {

                server.stop();          // ask the server to close the conection

            }

            catch(Exception eClose) {

            }

            server = null;

        }

        // dispose the frame

        dispose();

        System.exit(0);

    }

    // I can ignore the other WindowListener method

    public void windowClosed(WindowEvent e) {}

    public void windowOpened(WindowEvent e) {}

    public void windowIconified(WindowEvent e) {}

    public void windowDeiconified(WindowEvent e) {}

    public void windowActivated(WindowEvent e) {}

    public void windowDeactivated(WindowEvent e) {}

    /*

     * A thread to run the Server

     */

    class ServerRunning extends Thread {

        public void run() {

            server.start();         // should execute until if fails

            // the server failed

            stopStart.setText("Start");

            tPortNumber.setEditable(true);

            appendEvent("Server crashed\n");

            server = null;

        }

    }

}

// ClientGUI.java

import javax.swing.*;

import java.awt.*;

import java.awt.event.*;

/*

* The Client with its GUI

*/

public class ClientGUI extends JFrame implements ActionListener {

    private static final long serialVersionUID = 1L;

    // will first hold "Username:", later on "Enter message"

    private JLabel label;

    // to hold the Username and later on the messages

    private JTextField tf;

    // to hold the server address an the port number

    private JTextField tfServer, tfPort;

    // to Logout and get the list of the users

    private JButton login, logout, whoIsIn;

    // for the chat room

    private JTextArea ta;

    // if it is for connection

    private boolean connected;

    // the Client object

    private Client client;

    // the default port number

    private int defaultPort;

    private String defaultHost;

    // Constructor connection receiving a socket number

    ClientGUI(String host, int port) {

        super("Chat Client");

        defaultPort = port;

        defaultHost = host;

        

        // The NorthPanel with:

        JPanel northPanel = new JPanel(new GridLayout(3,1));

        // the server name anmd the port number

        JPanel serverAndPort = new JPanel(new GridLayout(1,5, 1, 3));

        // the two JTextField with default value for server address and port number

        tfServer = new JTextField(host);

        tfPort = new JTextField("" + port);

        tfPort.setHorizontalAlignment(SwingConstants.RIGHT);

        serverAndPort.add(new JLabel("Server Address:  "));

        serverAndPort.add(tfServer);

        serverAndPort.add(new JLabel("Port Number:  "));

        serverAndPort.add(tfPort);

        serverAndPort.add(new JLabel(""));

        // adds the Server an port field to the GUI

        northPanel.add(serverAndPort);

        // the Label and the TextField

        label = new JLabel("Enter your username below", SwingConstants.CENTER);

        northPanel.add(label);

        tf = new JTextField("Anonymous");

        tf.setBackground(Color.WHITE);

        northPanel.add(tf);

        add(northPanel, BorderLayout.NORTH);

        // The CenterPanel which is the chat room

        ta = new JTextArea("Welcome to the Chat room\n", 80, 80);

        JPanel centerPanel = new JPanel(new GridLayout(1,1));

        centerPanel.add(new JScrollPane(ta));

        ta.setEditable(false);

        add(centerPanel, BorderLayout.CENTER);

        // the 3 buttons

        login = new JButton("Login");

        login.addActionListener(this);

        logout = new JButton("Logout");

        logout.addActionListener(this);

        logout.setEnabled(false);       // you have to login before being able to logout

        whoIsIn = new JButton("Who is in");

        whoIsIn.addActionListener(this);

        whoIsIn.setEnabled(false);      // you have to login before being able to Who is in

        JPanel southPanel = new JPanel();

        southPanel.add(login);

        southPanel.add(logout);

        southPanel.add(whoIsIn);

        add(southPanel, BorderLayout.SOUTH);

        setDefaultCloseOperation(EXIT_ON_CLOSE);

        setSize(600, 600);

        setVisible(true);

        tf.requestFocus();

    }

    // called by the Client to append text in the TextArea

    void append(String str) {

        ta.append(str);

        ta.setCaretPosition(ta.getText().length() - 1);

    }

    // called by the GUI is the connection failed

    // we reset our buttons, label, textfield

    void connectionFailed() {

        login.setEnabled(true);

        logout.setEnabled(false);

        whoIsIn.setEnabled(false);

        label.setText("Enter your username below");

        tf.setText("Anonymous");

        // reset port number and host name as a construction time

        tfPort.setText("" + defaultPort);

        tfServer.setText(defaultHost);

        // let the user change them

        tfServer.setEditable(false);

        tfPort.setEditable(false);

        // don't react to a <CR> after the username

        tf.removeActionListener(this);

        connected = false;

    }

        

    /*

    * Button or JTextField clicked

    */

    public void actionPerformed(ActionEvent e) {

        Object o = e.getSource();

        // if it is the Logout button

        if(o == logout) {

            client.sendMessage(new ChatMessage(ChatMessage.LOGOUT, ""));

            return;

        }

        // if it the who is in button

        if(o == whoIsIn) {

            client.sendMessage(new ChatMessage(ChatMessage.WHOISIN, ""));             

            return;

        }

        // ok it is coming from the JTextField

        if(connected) {

            // just have to send the message

            client.sendMessage(new ChatMessage(ChatMessage.MESSAGE, tf.getText()));           

            tf.setText("");

            return;

        }

        

        if(o == login) {

            // ok it is a connection request

            String username = tf.getText().trim();

            // empty username ignore it

            if(username.length() == 0)

                return;

            // empty serverAddress ignore it

            String server = tfServer.getText().trim();

            if(server.length() == 0)

                return;

            // empty or invalid port numer, ignore it

            String portNumber = tfPort.getText().trim();

            if(portNumber.length() == 0)

                return;

            int port = 0;

            try {

                port = Integer.parseInt(portNumber);

            }

            catch(Exception en) {

                return;   // nothing I can do if port number is not valid

            }

            // try creating a new Client with GUI

            client = new Client(server, port, username, this);

            // test if we can start the Client

            if(!client.start())

                return;

            tf.setText("");

            label.setText("Enter your message below");

            connected = true;

            

            // disable login button

            login.setEnabled(false);

            // enable the 2 buttons

            logout.setEnabled(true);

            whoIsIn.setEnabled(true);

            // disable the Server and Port JTextField

            tfServer.setEditable(false);

            tfPort.setEditable(false);

            // Action listener for when the user enter a message

            tf.addActionListener(this);

        }

    }

    // to start the whole thing the server

    public static void main(String[] args) {

        new ClientGUI("localhost", 1500);

    }

}