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package com.orbekk.net;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.SocketException;
import org.apache.log4j.Logger;
public class BroadcastListener {
private int port;
private Logger logger = Logger.getLogger(getClass());
public BroadcastListener(int port) {
this.port = port;
}
public boolean listen() {
logger.info("Waiting for broadcast on port " + port);
DatagramSocket socket;
try {
socket = new DatagramSocket(port);
} catch (SocketException e) {
logger.warn("Failed to create socket.", e.fillInStackTrace());
return true;
}
try {
socket.setBroadcast(true);
} catch (SocketException e) {
logger.warn(e.fillInStackTrace());
}
byte[] buffer = new byte[2048];
DatagramPacket packet = new DatagramPacket(buffer, buffer.length);
try {
socket.receive(packet);
} catch (IOException e) {
logger.warn(e.fillInStackTrace());
}
logger.info("Received broadcast from " + packet.getAddress() +
": " + new String(packet.getData()));
return true;
}
public static void main(String[] args) {
int port = Integer.parseInt(args[0]);
BroadcastListener listener = new BroadcastListener(port);
System.out.println("Received broadcast: " + listener.listen());
}
}
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