kommunikationsnetze-und-protokolle-bsc-ai-examples/src/perf/TCPPerfClient.java

package perf;

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.InputStreamReader;
import java.net.Socket;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;

class TCPPerfClient {
	public static void main(String argv[]) throws Exception {
		String hostname = "";
		int tcpPort = 36039;
		DateFormat df = new SimpleDateFormat("dd.MM.yyyy HH:mm:ss");

		//System.out.println("Bitte geben Sie die Server-Adresse ein: ");
		//hostname = inFromUser.readLine();
		hostname = "127.0.0.1";
		
		while (true ) {
			BufferedReader inFromUser = new BufferedReader(new InputStreamReader(System.in));
			System.out.print("Bitte geben Sie die Anzahl zu übertragender Megabytes ein: ");
			Long number = new Long(inFromUser.readLine());
			//Long number = (long)1;
			
			Socket clientSocket = new Socket(hostname, tcpPort);

			DataOutputStream outToServer = new DataOutputStream(clientSocket.getOutputStream());
			BufferedReader inFromServer = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));

			long timestampStart = System.currentTimeMillis();
			System.out.println("Zeit vor Versand = " + timestampStart + " ms, " + df.format(new Date(timestampStart)));
			outToServer.writeBytes(number.toString() + "\n");
			
			if (number == 0) {
				break;
			}

			char[] buffer = new char[1024 * 1024];
			long totalBytesReceived = 0;
			int charsRead = inFromServer.read(buffer);
			while (charsRead != -1)
			{
				totalBytesReceived += charsRead;
				charsRead = inFromServer.read(buffer);
			}
		
			long timestampEnd = System.currentTimeMillis();
			System.out.println("Zeit nach Empfang = " + timestampEnd + " ms, " + df.format(new Date(timestampEnd)));
			long duration = timestampEnd - timestampStart;
			System.out.println("Delay = " + duration + " ms");
			double seconds = (duration / 1000.0);
			double throughput = (totalBytesReceived / seconds);
			System.out.println("Rate = " + (long)throughput + " B/s");
			clientSocket.close();		
		}
	}
}