package javaNetUDP; import java.io.BufferedReader; import java.io.BufferedWriter; import java.io.IOException; import java.io.InputStreamReader; import java.io.OutputStreamWriter; import java.net.DatagramPacket; import java.net.DatagramSocket; import java.net.ServerSocket; import java.net.Socket; import java.nio.charset.StandardCharsets; import java.time.LocalDateTime; public class UDPServer { public static void main(String[] args) throws Exception { @SuppressWarnings("resource") DatagramSocket ds = new DatagramSocket(9090); System.out.println("UDP server ready."); for(;;){ // receive: byte[] buffer = new byte[1024]; DatagramPacket packet = new DatagramPacket(buffer, buffer.length); ds.receive(packet); byte[] data = packet.getData(); String s = new String(data, StandardCharsets.UTF_8); System.out.println("Packet received from: " + packet.getSocketAddress()); // send: String resp = LocalDateTime.now().toString(); packet.setData(resp.getBytes(StandardCharsets.UTF_8)); ds.send(packet); } } }