Client.java Class

package sample.controllers;

import javafx.application.Application;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.scene.Node;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.PasswordField;
import javafx.scene.control.TextField;
import javafx.scene.input.MouseEvent;
import javafx.stage.Stage;

import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.net.Socket;

public class Client extends Application {

        // for I/O
        private ObjectInputStream sInput;       // to read from the socket
        private ObjectOutputStream sOutput;     // to write on the socket
        private Socket socket;

        // if I use a GUI or not
        private ClientGUI cg;

        // the server, the port and the username
        private String server, username;
        private int port;


        boolean keepGoing;
        private Object RegisterController;

        /*
         *  Constructor called by console mode
         *  server: the server address
         *  port: the port number
         *  username: the username
         */
        Client(String server, int port, String username) {
            // which calls the common constructor with the GUI set to null
            this(server, port, username, null);
        }

        /*
         * Constructor call when used from a GUI
         * in console mode the ClienGUI parameter is null
         */
        Client(String server, int port, String username, ClientGUI cg) {
            keepGoing = true;
            this.server = server;
            this.port = port;
            this.username = username;
            // save if we are in GUI mode or not
            this.cg = cg;
        }

        /*
         * To start the dialog
         */
        public boolean start() {
            // try to connect to the server
            try {
                socket = new Socket(server, port);
            }
            // if it failed not much I can so
            catch(Exception ec) {
                display("Error connectiong to server:" + ec);
                return false;
            }

            String msg = "Connection accepted " + socket.getInetAddress() + ":" + socket.getPort();
            display(msg);

            /* Creating both Data Stream */
            try
            {
                sInput  = new ObjectInputStream(socket.getInputStream());
                sOutput = new ObjectOutputStream(socket.getOutputStream());
            }
            catch (IOException eIO) {
                display("Exception creating new Input/output Streams: " + eIO);
                return false;
            }

            // creates the Thread to listen from the server
            new sample.controllers.Client.ListenFromServer().start();
            // Send our username to the server this is the only message that we
            // will send as a String. All other messages will be ChatMessage objects
            try
            {
                sOutput.writeObject(username);
            }
            catch (IOException eIO) {
                display("Exception doing login : " + eIO);
                disconnect();
                return false;
            }
            // success we inform the caller that it worked
            return true;
        }

        /*
         * To send a message to the console or the GUI
         */
        private void display(String msg) {
            if(cg == null)
                System.out.println(msg);      // println in console mode
            else
                cg.append(msg + "\n");      // append to the ClientGUI JTextArea (or whatever)
        }

        /*
         * To send a message to the server
         */
        void sendMessage(ChatMessage msg) {
            try {
                sOutput.writeObject(msg);
            }
            catch(IOException e) {
                display("Exception writing to server: " + e);
            }
        }

        /*
         * When something goes wrong
         * Close the Input/Output streams and disconnect not much to do in the catch clause
         */
        private void disconnect() {
            try {
                if(sInput != null) sInput.close();
            }
            catch(Exception e) {} // not much else I can do
            try {
                if(sOutput != null) sOutput.close();
            }
            catch(Exception e) {} // not much else I can do
            try{
                if(socket != null) socket.close();
            }
            catch(Exception e) {} // not much else I can do

            // inform the GUI
            if(cg != null)
                cg.connectionFailed();
            keepGoing = false;
        }
        /*
         * To start the Client in console mode use one of the following command
         * > java Client
         * > java Client username
         * > java Client username portNumber
         * > java Client username portNumber serverAddress
         * at the console prompt
         * If the portNumber is not specified 1500 is used
         * If the serverAddress is not specified "localHost" is used
         * If the username is not specified "Anonymous" is used
         * > java Client
         * is equivalent to
         * > java Client Anonymous 1500 localhost
         * are eqquivalent
         *
         * In console mode, if an error occurs the program simply stops
         * when a GUI id used, the GUI is informed of the disconnection
         */




        void mainWindow()
        {

            FXMLLoader loader = new FXMLLoader(getClass().getResource("register.fxml"));
            loader.setController(RegisterController);
        }



        /*
         * a class that waits for the message from the server and append them to the JTextArea
         * if we have a GUI or simply System.out.println() it in console mode
         */
        class ListenFromServer extends Thread {

            public void run() {
                while(true) {
                    try {
                        String msg = (String) sInput.readObject();

                        // if console mode print the message and add back the prompt
                        if(cg == null) {

                            System.out.println(msg);
                            System.out.print("> ");
                        }
                        else {
                            cg.append(msg);
                        }
                    }
                    catch(IOException e) {
                        display("Server has close the connection: " + e);
                        if(cg != null)
                            cg.connectionFailed();
                        break;
                    }
                    // can't happen with a String object but need the catch anyhow
                    catch(ClassNotFoundException e2) {
                    }
                }
            }
        }
        //Main FXML Controller
        @FXML
        private Button Lab_Button;

        @FXML
        private Button Tutorials_Button;

        @FXML
        private Button logout_button;

        @FXML
        void Lab(MouseEvent event) {

        }

        @FXML
        void Logout(MouseEvent event) {

        }

        @FXML
        void Tutorials(MouseEvent event) {

        }

        //Login FXML Controller
        @FXML
        private TextField tf_username;

        @FXML
        private PasswordField pf_password;

        @FXML
        void login(MouseEvent event) {

        }

        @FXML
        void Login_Reg(MouseEvent event) {

        }

        //Register FXML Controller//
    @FXML
    private TextField tf_reg_username;

    @FXML
    private TextField tf_reg_email;

    @FXML
    private PasswordField pf_reg_password;

    @FXML
    void Reg_login(MouseEvent event) {

    }

    @FXML
    void register(MouseEvent event) {

    }


    @Override
    public void start(Stage stage) throws Exception{
        Parent root = FXMLLoader.load(getClass().getResource("/sample/controllers/register.fxml"));
        Scene scene = new Scene(root);

        stage.setScene(scene);

        stage.setTitle("PL SQL Yourself!");

        stage.show();
    }


    public static void main(String[] args) {
        launch(args);

        /*// default values
        int portNumber = 1700;
        String serverAddress = "localhost";
        String userName = "Anonymous";

        // depending of the number of arguments provided we fall through

        // create the Client object
        sample.controllers.Client client = new sample.controllers.Client(serverAddress, portNumber, userName);
        // test if we can start the connection to the Server
        // if it failed nothing we can do
        if(!client.start())
            return;
        // done disconnect
        client.disconnect();*/
    }
}