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/* Angelehnt an Kurose/Ross Computernetzwerke (bis 5e Java, ab 6e Python) */
package socket;
import java.net.*;
class Server1 { public static void main(String args[]) throws Exception { int port = 36037;
DatagramSocket serverSocket = new DatagramSocket(port);
byte[] receiveData = new byte[1024]; byte[] sendData = new byte[1024]; String message; String modifiedMessage;
System.out.println("Server1 gestartet. Warte auf eingehende Requests..."); while (true) { DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length); serverSocket.receive(receivePacket); message = new String(receivePacket.getData(), 0, receivePacket.getLength());
InetAddress clientAddress = receivePacket.getAddress(); int clientSrcPort = receivePacket.getPort();
System.out.println("Request von Client1 " + clientAddress + ":" + clientSrcPort + " empfangen. Erzeuge und sende Antwort..."); if (message.equals("exit")) { break; } modifiedMessage = message.toUpperCase(); sendData = modifiedMessage.getBytes(); DatagramPacket sendPacket = new DatagramPacket(sendData, sendData.length, clientAddress, clientSrcPort); serverSocket.send(sendPacket); } serverSocket.close(); } }
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