Created main file

Author: NisarLDev

UDP_Server_And_Client_Application/Programed_In_the_teacher's_way/Main.java

@@ -0,0 +1,63 @@
+import javax.xml.crypto.Data;
+import java.io.IOException;
+import java.net.DatagramPacket;
+import java.net.DatagramSocket;
+import java.net.InetAddress;
+import java.net.SocketException;
+
+public class Main {
+
+    private static final int PORT  = 2082;
+    private static DatagramSocket datagramSocket;
+    private static DatagramPacket inPacket,outPacket;
+    private static byte[] buffer;
+
+
+    public static void main(String[] args) {
+
+        System.out.println("Opening port. . . \n");
+        try {
+            datagramSocket = new DatagramSocket(PORT);              //STEP 1
+        } catch (SocketException socketException) {
+            System.out.println("UNABLE TO OPEN PORT");
+            System.out.println(socketException.getMessage());
+            System.exit(1);
+        }
+        handleClient();
+    }
+
+    public static void handleClient() {
+        try {
+            String messageIn, messageOut;
+            int numMessages = 0;
+            InetAddress clientAddress = null;
+            int clientPort;
+            do {
+                buffer = new byte[256];         //STEP 2
+                inPacket = new DatagramPacket(buffer, buffer.length); //STEP 3
+                datagramSocket.receive(inPacket);                   //STEP 4
+
+                clientAddress = inPacket.getAddress();              //STEP 5
+                clientPort = inPacket.getPort();
+
+                messageIn = new String(inPacket.getData(), 0, inPacket.getLength
+());  //STEP 6
+                System.out.println("Message Received");
+                numMessages++;
+                messageOut = "Message " + numMessages + " : " + messageIn;
+                outPacket = new DatagramPacket(messageOut.getBytes(), messageOut
+.length(), clientAddress, clientPort); //STEP 7
+                datagramSocket.send(outPacket);  //STEP 8
+                System.out.println("MESSAGE : " + messageOut);
+            } while (true);
+
+        } catch (IOException ioException) {
+            ioException.printStackTrace();
+        }
+        finally {
+            System.out.println("\n *CLOSING THE CONNECTION*");
+            datagramSocket.close();
+
+        }
+    }
+}