exercice 4

ClientServeur/src/Server.java

@@ -0,0 +1,53 @@
+import java.io.IOException;
+import java.net.DatagramPacket;
+import java.net.DatagramSocket;
+import java.net.InetAddress;
+import java.net.SocketException;
+
+public class Server {
+
+	private final DatagramSocket socket;
+
+	public Server(int port) throws SocketException {
+		this.socket = new DatagramSocket(port);
+		new Thread(this::readMessages).start();
+	}
+
+	private void sendMessage(String message, InetAddress address, int port) throws IOException {
+		byte[] buffer = message.getBytes();
+		DatagramPacket packet = new DatagramPacket(buffer, buffer.length, address, port);
+		this.socket.send(packet);
+	}
+
+	private void processHandshake(DatagramPacket packet) throws IOException {
+		String message = new String(packet.getData(), 0, packet.getLength());
+		String machineName = message.split(" ")[2];
+		System.out.println("\t[Server] Nouveau client : @" + packet.getAddress().getHostAddress() + ": " + packet.getPort());
+		sendMessage("Serveur " + machineName + " ready", packet.getAddress(), packet.getPort());
+	}
+
+	private void processMessage(DatagramPacket packet) throws IOException {
+		String message = new String(packet.getData(), 0, packet.getLength());
+		System.out.println("[Server] Message recieved : " + message);
+		if (message.startsWith("hello serveur")) {
+			processHandshake(packet);
+			return;
+		}
+		sendMessage(message, packet.getAddress(), packet.getPort());
+	}
+
+	private void readMessages() {
+		while (true) {
+			byte[] buffer = new byte[1024];
+			DatagramPacket packet = new DatagramPacket(buffer, buffer.length);
+			try {
+				this.socket.receive(packet);
+				processMessage(packet);
+			} catch (IOException e) {
+				e.printStackTrace();
+				break;
+			}
+		}
+	}
+
+}