Created
July 2, 2013 01:03
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Example of using Multicast socket to exchange datagrams
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import java.net.MulticastSocket; | |
import java.lang.Thread; | |
import java.net.InetAddress; | |
import java.net.DatagramPacket; | |
import java.io.BufferedReader; | |
import java.io.InputStreamReader; | |
import java.io.IOException; | |
import java.net.UnknownHostException; | |
public class Client extends Thread { | |
private MulticastSocket sock; | |
private InetAddress group; | |
private int port; | |
public Client(InetAddress group,int port) throws IOException { | |
this.group = group; | |
this.port = port; | |
sock = new MulticastSocket(port); | |
sock.setTimeToLive(2); | |
sock.joinGroup(group); | |
} | |
public void run(){ | |
System.out.println("Hi, I ("+this.getId()+") am listening!"); | |
try{ | |
while(true){ | |
DatagramPacket d = new DatagramPacket(new byte[256],256); | |
sock.receive(d); | |
String result = new String(d.getData()); | |
System.out.println(this.getId()+" received "+result); | |
} | |
}catch(IOException e){ | |
System.err.println("Arrrrgh: "+e); | |
} | |
} | |
public void send(String msg) throws IOException { | |
byte[] data = msg.getBytes(); | |
System.out.println(this.getId() + " sending "+data); | |
DatagramPacket d = new DatagramPacket(data,data.length,group,port); | |
sock.send(d); | |
} | |
public static void main(String[] args){ | |
try{ | |
int n = Integer.parseInt(args[0]); | |
Client[] clients = new Client[n]; | |
InetAddress group = InetAddress.getByName("224.255.255.255"); | |
for(int i=0; i<n;i++){ | |
int port = 9001; | |
Client c = new Client(group,port); | |
c.start(); | |
clients[i] = c; | |
} | |
BufferedReader in = new BufferedReader(new InputStreamReader(System.in)); | |
while(true){ | |
String x = in.readLine(); | |
if(x=="exit"){ return; } | |
clients[0].send(x); | |
} | |
}catch(IOException e){ System.out.println("Argh: "+e); } | |
/*catch(UnknownHostException e){ System.out.println("Zounds: "+e); }*/ | |
} | |
} |
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