Concurrent, Real-Time and Distributed Programming in Java by Badr Benmammar

Author:Badr Benmammar [Неизв.]
Language: eng
Format: epub
ISBN: 9781119482758
Publisher: John Wiley & Sons, Inc.
Published: 2017-12-13T00:00:00+00:00

Execution:

Server side:

connected

received: A

Client side:

server -> client: Student: A GL: 13

4.2.1.8. Communications between a Java applet and a server using sockets

The following execution shows a communication between an applet and a server using sockets:

Figure 4.4. Communication between an applet and a server with the Sockets. For a color version of the figure, see www.iste.co.uk/benmammar/java.zip

The implementation of the server is as follows:

import java.io.*; import java.net.*; import java.util.*; public class NetServer { public static void main(String[] args) { try{ ServerSocket serverSocket = new ServerSocket(8765); Socket clientSocket = serverSocket.accept(); BufferedReader in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream())); PrintWriter out = new PrintWriter(clientSocket.getOutputStream(), true); while (true) { Integer numb = new Integer(in.readLine()); System.out.println("recu: " + numb.intValue()); out.println(numb.intValue()+1); } }catch(IOException ex){System.err.println(ex);} } }

The implementation of the client is as follows:

import java.applet.Applet; import java.awt.*; import java.awt.event.*; import java.io.*; import java.net.*; public class NetApplet extends Applet implements ActionListener { TextField numbField; Label display; Socket socket; public void init() { try { socket = new Socket("localhost",8765); } catch (UnknownHostException e) {System.out.println("Unknown host");} catch (IOException e) { System.out.println("IO Exception");} numbField = new TextField(6); add(numbField); Button button = new Button("Send"); add(button); button.addActionListener(this); display = new Label("Pas de nombre"); add(display); } public void actionPerformed(ActionEvent e) { int numb = 0; String numbStr = null; BufferedReader in = null; PrintWriter out = null; String actionCommand = e.getActionCommand(); // know the source of the event if (e.getSource() instanceof Button) if (actionCommand.equals("Send")){ try {numb = Integer.parseInt(numbField.getText());} catch (NumberFormatException ex) {System.out.println ("Number Format Exception");} try { in = new BufferedReader(new InputStreamReader(socket.getInputStream())); out = new PrintWriter(socket.getOutputStream(), true); } catch (IOException ex) {System.out.println("IO Exception");} out.println(numb); try {numbStr = in.readLine();} catch (IOException ex) {System.out.println("Applet receive failed:");} display.setText(numbStr); } } }// end of class

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