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- import java.io.IOException;
- import java.net.*;
- public class Rfc865UdpServer {
- public static void main(String[] args) {
- //
- // open udp socket at well know port
- //
- DatagramSocket socket = null;
- try {
- socket = new DatagramSocket(17);
- } catch (SocketException e) {
- System.out.println(e.getMessage());
- }
- int byteLength = 512;
- byte[] receiveData = new byte[byteLength];
- while (true) {
- try {
- //
- // listen for UDP request from client
- //
- System.out.println("Waiting to receive request");
- DatagramPacket request = new DatagramPacket(receiveData, receiveData.length);
- try {
- socket.receive(request);
- } catch (NullPointerException nullEx) {
- nullEx.getMessage();
- }
- String receiveMsg = new String(receiveData);
- System.out.println(receiveMsg);
- //
- // Send UDP reply to client
- //
- InetAddress clientAddress = request.getAddress();
- int clientPort = request.getPort();
- String msg = "Message received! waiting for another message";
- byte[] replyMsg = new byte[512];
- replyMsg = msg.getBytes();
- DatagramPacket reply = new DatagramPacket(replyMsg,replyMsg.length,clientAddress,clientPort);
- socket.send(reply);
- System.out.println("Reply send");
- } catch (IOException e) {
- e.getMessage();
- }
- }
- }
- }
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