NETWORKING - Introduction to Java Programming: Comprehensive Version - page 1144

4 import javafx.application.Application;
5 import javafx.application.Platform;
6 import javafx.scene.Scene;
7 import javafx.scene.control.ScrollPane;
8 import javafx.scene.control.TextArea;
9 import javafx.stage.Stage;
10
11 public class Server extends Application {
12 @Override // Override the start method in the Application class
13 public void start(Stage primaryStage) {
14 // Text area for displaying contents
15 TextArea ta = new TextArea();
16
17 // Create a scene and place it in the stage
18 Scene scene = new Scene( new ScrollPane(ta), 450 , 200 );
19 primaryStage.setTitle( "Server" ); // Set the stage title
20 primaryStage.setScene(scene); // Place the scene in the stage
21 primaryStage.show(); // Display the stage
22
23 new Thread(() -> {
24 try {
25 // Create a server socket
26 ServerSocket serverSocket = new ServerSocket( 8000 );
27 Platform.runLater(() ->
28 ta.appendText( "Server started at " + new Date() + '\n' ));
29
30

create server UI

server socket
update UI

// Listen for a connection request

31 Socket socket = serverSocket.accept();

connect client

32
33 // Create data input and output streams

34 DataInputStream inputFromClient = new DataInputStream( input from client

35 socket.getInputStream());

36 DataOutputStream outputToClient = new DataOutputStream( output to client

37 socket.getOutputStream());

38
39 while ( true ) {

40 // Receive radius from the client

41 double radius = inputFromClient.readDouble();

read radius

42
43

// Compute area

44 double area = radius * radius * Math.PI;

45
46

// Send area back to the client

47 outputToClient.writeDouble(area);

write area

48
49 Platform.runLater(() -> {
50 ta.appendText( "Radius received from client: "
51 + radius + '\n' );
52 ta.appendText( "Area is: " + area + '\n' );
53 });
54 }
55 }
56 catch (IOException ex) {
57 ex.printStackTrace();
58 }
59 }).start();
60 }
61 }

update UI