Application Code for the Send Mail App

package sendMailApp;
    /*
     *  Application Code for the Send Mail App
     *
     *  Lu Liu
     *  CSCI-211 Intermediate Java Programming
     *  4/20/2015
     */
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.PrintWriter;
import java.net.Socket;
import java.util.Scanner;

import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.TextArea;
import javafx.scene.control.TextField;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.FlowPane;
import javafx.stage.Stage;

    public class SendMailApp extends Application {
        private TextField txtTo;
        private TextField txtFrom;
        private TextField txtSubject;
        private TextArea  txtBody;
        private TextField txtStatus;
        private Button btnSend;

        @Override
        // Override the start method in the Application class
        public void start(Stage primaryStage) {
            txtTo = new TextField();
            txtTo.setPrefColumnCount(25);
            txtFrom = new TextField();
            txtFrom.setPrefColumnCount(25);
            txtSubject = new TextField();
            txtSubject.setPrefColumnCount(25);
            txtBody = new TextArea();
            txtBody.setPrefColumnCount(28);
            txtBody.setPrefRowCount(10);
            btnSend = new Button("Send Email");
            txtStatus = new TextField();
            txtStatus.setPrefColumnCount(25);
            txtStatus.setEditable(false);

            Label lblTo = new Label("Mail To:");
            lblTo.setPrefWidth(90);
            Label lblFrom = new Label("Mail From:");
            lblFrom.setPrefWidth(90);
            Label lblSubject = new Label("Subject:");
            lblSubject.setPrefWidth(90);

            FlowPane tpane = new FlowPane(5, 5);
            tpane.setAlignment(Pos.BASELINE_LEFT);
            tpane.setPadding(new Insets(10, 5, 5, 5));
            tpane.setStyle("-fx-font-weight: bold; -fx-font-size: 12pt");
            tpane.getChildren().addAll(lblTo, txtTo, lblFrom, txtFrom, lblSubject, txtSubject);

            FlowPane cpane = new FlowPane(5, 5);
            cpane.setAlignment(Pos.CENTER);
            cpane.setPadding(new Insets(5, 5, 5, 5));
            cpane.setStyle("-fx-font-weight: bold; -fx-font-size: 12pt");
            cpane.getChildren().addAll(new Label("Enter your message below:"), txtBody, btnSend);

            Label lblStatus = new Label("Status:");
            lblStatus.setPrefWidth(90);
            FlowPane bpane = new FlowPane(5, 5);
            bpane.setAlignment(Pos.BASELINE_LEFT);
            bpane.setPadding(new Insets(5, 5, 10, 5));
            bpane.setStyle("-fx-font-weight: bold; -fx-font-size: 12pt");
            bpane.getChildren().addAll(lblStatus, txtStatus);

            BorderPane bp = new BorderPane();
            bp.setTop(tpane);
            bp.setCenter(cpane);
            bp.setBottom(bpane);

            btnSend.setOnAction(e -> {
                txtStatus.setText("Message Sent Successfully");
                runClient();
            });

            Scene scene = new Scene(bp, 525, 520);
            primaryStage.setTitle("Send Mail Application");
            primaryStage.setScene(scene);
            primaryStage.show();
            primaryStage.setResizable(false);
        }

        /**
         * The main method is only needed for the IDE with limited JavaFX support.
         * Not needed for running from the command line.
         */
        public static void main(String[] args) {
            launch(args);
        }

        public void runClient(){
            Socket client = null;
            PrintWriter output = null;
            Scanner input = null;
//          DataOutputStream output = null;
//          DataInputStream input = null;

            try {
                // Create a socket to connect to the server
                client = new Socket("cs.stcc.edu", 25);
                input.nextLine();

                //HELO
                output = new PrintWriter("HELO cs.stcc.edu");
                System.out.println(input.nextLine());
                output.flush();

                //Mail From
                output.println(txtTo.getText());
                System.out.println(input.nextLine());
                output.flush();

                //Mail To
                output.println(txtFrom.getText());
                System.out.println(input.nextLine());
                output.flush();

                //Message Body
                output.println("DATA");