Java examples for Network:UDP
An Echo Server Based on UDP Sockets
import java.net.DatagramPacket; import java.net.DatagramSocket; import java.net.InetAddress; public class Main { public static void main(String[] args) throws Exception { DatagramSocket udpSocket = new DatagramSocket(5555, InetAddress.getByName("localhost")); System.out.println("Created UDP server socket at " + udpSocket.getLocalSocketAddress() + "..."); while (true) { System.out.println("Waiting for a UDP packet" + " to arrive..."); DatagramPacket packet = new DatagramPacket(new byte[1024], 1024); udpSocket.receive(packet);/* ww w . ja v a2 s . co m*/ displayPacketDetails(packet); udpSocket.send(packet); } } public static void displayPacketDetails(DatagramPacket packet) { // Get the message byte[] msgBuffer = packet.getData(); int length = packet.getLength(); int offset = packet.getOffset(); int remotePort = packet.getPort(); InetAddress remoteAddr = packet.getAddress(); String msg = new String(msgBuffer, offset, length); System.out.println("Received a packet:[IP Address=" + remoteAddr + ", port=" + remotePort + ", message=" + msg + "]"); } }