MULTICAST NETWORKMobile Programming

LAST WEEK

TODAY

It’s all about UDP

USER DATAGRAM PROTOCOL

USER DATAGRAM PROTOCOL

UDP VS TCP

UDP is simple and faster compared to TCP

NOW LET’S BROADCAST SOMETHING!

WHAT WE WILL BUILD

WHAT WE WILL BUILD

Hello

ClientServer

HELLO

1 import java.io.*; 2 import java.net.*; 3 4 class UDPServer { 5 public static void main(String args[]) throws Exception { 6 DatagramSocket serverSocket = new DatagramSocket(9876); 7 byte[] receiveData = new byte[1024]; 8 byte[] sendData = new byte[1024]; 9 10 while(true) { 11 DatagramPacket receivePacket = new DatagramPacket(receiveData, 12 receiveData.length); 13 serverSocket.receive(receivePacket); 14 String sentence = new String(receivePacket.getData()); 15 System.out.println("RECEIVED: " + sentence); 16 InetAddress IPAddress = receivePacket.getAddress();

17 int port = receivePacket.getPort(); 18 String capitalizedSentence = sentence.toUpperCase(); 19 sendData = capitalizedSentence.getBytes(); 20 DatagramPacket sendPacket = new DatagramPacket(sendData, sendData. 21 length, IPAddress, port); 22 serverSocket.send(sendPacket); 23 } 24 } 25 }

1 import java.io.*; 2 import java.net.*; 3 4 class UDPClient { 5 public static void main(String args[]) throws Exception { 6 BufferedReader inFromUser = new BufferedReader(new InputStreamReader( 7 System.in)); 8 DatagramSocket clientSocket = new DatagramSocket(); 9 InetAddress IPAddress =InetAddress.getByName("localhost"); 10 byte[] sendData = new byte[1024]; 11 byte[] receiveData = new byte[1024]; 12 String sentence = inFromUser.readLine(); 13 sendData = sentence.getBytes(); 14 DatagramPacket sendPacket = new DatagramPacket(sendData, sendData.length, 15 IPAddress, 9876); 16 clientSocket.send(sendPacket); 17 18 19 DatagramPacket receivePacket = new DatagramPacket(receiveData, 20 receiveData.length); 21 clientSocket.receive(receivePacket); 22 String modifiedSentence = new String(receivePacket.getData()); 23 System.out.println("FROM SERVER: " + modifiedSentence); 24 clientSocket.close(); 25 } 26 }

YOUR TURN!

YOUR TURN!

Besok

ClientServer

16 Maret 2016

GROUP ASSIGNMENT