refactor: UDP client-server communication flow

app/src/main/java/clientserver/ClientHandler.java

@@ -11,10 +11,7 @@ public class ClientHandler {
         int port = 6666;
         boolean running = true;
         DatagramSocket socketServer = null;
-
-        while (running) {
         try {
-                // 1 - Création du canal
             socketServer = new DatagramSocket(null);
             // 2 - Réservation du port
             InetSocketAddress address = new InetSocketAddress(
@@ -22,16 +19,40 @@ public class ClientHandler {
                 port
             );
             socketServer.bind(address);
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+
+        while (running) {
+            try {
+                // 1 - Création du canal
+
                 // 3 - Recevoir
                 byte[] recues = new byte[1024]; // tampon de réception
                 DatagramPacket receivedPacket = new DatagramPacket(
                     recues,
                     recues.length
                 );
-
                 socketServer.receive(receivedPacket);
+                InetAddress clientAddress = receivedPacket.getAddress();
+                int clientPort = receivedPacket.getPort();
+                System.out.println(
+                    "Nouveau client : @" + clientAddress + ":" + clientPort
+                );
+                DatagramSocket socket = new DatagramSocket(); // Reserve new port
 
-                Thread thread = new Thread(() -> createThread(receivedPacket));
+                String response = "PORT:" + socket.getLocalPort();
+                System.out.println(response);
+                byte[] envoyees; // tampon d'émission
+                envoyees = response.getBytes();
+                DatagramPacket packetToSend = new DatagramPacket(
+                    envoyees,
+                    envoyees.length,
+                    clientAddress,
+                    clientPort
+                );
+                socketServer.send(packetToSend);
+                Thread thread = new Thread(() -> createThread(socket));
                 thread.start();
             } catch (Exception e) {
                 System.err.println(e);
@@ -41,25 +62,20 @@ public class ClientHandler {
         socketServer.close();
     }
 
-    public static void createThread(DatagramPacket packet) {
+    public static void createThread(DatagramSocket socketClientThread) {
         try {
-            InetAddress clientAddress = packet.getAddress();
+            byte[] recues = new byte[1024]; // tampon de réception
-            int clientPort = packet.getPort();
+            DatagramPacket receivedPacket = new DatagramPacket(
-            System.out.println(
+                recues,
-                "Nouveau client : @" + clientAddress + ":" + clientPort
+                recues.length
             );
-            DatagramSocket socket = new DatagramSocket(); // Reserve new port
+            socketClientThread.receive(receivedPacket);
-
+            String message = new String(
-            String response = "PORT:" + socket.getLocalPort();
+                receivedPacket.getData(),
-            byte[] envoyees; // tampon d'émission
+                0,
-            envoyees = response.getBytes();
+                receivedPacket.getLength()
-            DatagramPacket packetToSend = new DatagramPacket(
-                envoyees,
-                envoyees.length,
-                clientAddress,
-                clientPort
             );
-            socket.send(packetToSend);
+            System.out.println("Received message: " + message);
         } catch (Exception e) {
             System.err.println(e);
         }