initial version of udp ping client

VerteilteSysteme-Examples/src/verteiltesysteme/socket/timecounter/UDPTimeCounterClientPing.java

@@ -0,0 +1,52 @@
+package verteiltesysteme.socket.timecounter;
+
+import java.io.BufferedReader;
+import java.io.InputStreamReader;
+import java.net.DatagramPacket;
+import java.net.DatagramSocket;
+import java.net.InetAddress;
+
+class UDPTimeCounterClientPing {
+	public static void main(String args[]) throws Exception {
+		String hostname = "";
+		int udpPort = 36038;
+		BufferedReader inFromUser = new BufferedReader(new InputStreamReader(System.in));
+		DatagramSocket clientSocket = new DatagramSocket();
+		byte[] sendData = new byte[1024];
+		byte[] receiveData = new byte[1024];
+				
+		System.out.println("Bitte geben Sie die Server-Adresse ein: ");
+		hostname = inFromUser.readLine();
+		InetAddress IPAddress = InetAddress.getByName(hostname);
+		System.out.println("Bitte geben Sie die Anzahl gewünschter Pings ein: ");
+		Long pingCount = new Long(inFromUser.readLine());
+		Long number = new Long(1);
+		sendData = number.toString().getBytes();
+
+		DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length);
+
+		long average = 0;
+		for (long i = 0; i < pingCount; i++)
+		{
+			long timestampStart = System.currentTimeMillis();
+			DatagramPacket sendPacket = new DatagramPacket(sendData, sendData.length, IPAddress, udpPort);
+			clientSocket.send(sendPacket);
+			receivePacket = new DatagramPacket(receiveData, receiveData.length);
+
+			clientSocket.receive(receivePacket);
+
+			long timestampEnd = System.currentTimeMillis();
+			long delay = timestampEnd - timestampStart;
+			average += delay;
+			System.out.println("Delay = " + delay + " ms");
+			Thread.sleep(1000);
+		}
+		System.out.println("Durchschnitt: " + (average / (float)pingCount) + " ms");
+		System.out.println(System.lineSeparator());
+		
+		String result = new String(receivePacket.getData());
+		System.out.println("Ausgabe vom Server:" + System.lineSeparator() + result);
+		System.out.println(System.lineSeparator());
+		clientSocket.close();
+	}
+}