VoteMulticastSender.java
package com.tcpip;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.InetAddress;
import java.net.MulticastSocket;
/**
* 多播的发送者
* @author Administrator
*
*/
public class VoteMulticastSender {
public static final int CANDIDATE = 475;
public static void main(String[] args) throws IOException{
//IPv4的多播地址范围是:224.0.0.0--239.255.255.255
args = new String[]{"224.0.0.1","9999","100"};
InetAddress destAddr = InetAddress.getByName(args[0]);
if(!destAddr.isMulticastAddress()){
throw new IllegalArgumentException("Not a multicast address");
}
int destPort = Integer.parseInt(args[1]);
int TTL = (args.length==3)?Integer.parseInt(args[2]):1;
MulticastSocket sock = new MulticastSocket();
sock.setTimeToLive(TTL);
VoteMsgCoder coder = new VoteMsgTextCoder();
VoteMsg vote = new VoteMsg(true,true,CANDIDATE,1000001L);
byte[] msg = coder.toWire(vote);
DatagramPacket message = new DatagramPacket(msg,msg.length,destAddr,destPort);
System.out.println("Sending Text-Encoded Request ("+msg.length+ " bytes):");
System.out.println(vote);
sock.send(message);
sock.close();
}
}
VoteMulticastReceiver.java:
package com.tcpip;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.InetAddress;
import java.net.MulticastSocket;
import org.bouncycastle.util.Arrays;
/**
* 多播的接收者,可多次运行,则当前多播组里有多个成员
* @author Administrator
*
*/
public class VoteMulticastReceiver {
public static void main(String[] args) throws IOException{
args = new String[]{"224.0.0.1","9999"};
InetAddress address = InetAddress.getByName(args[0]);
if(!address.isMulticastAddress()){
throw new IllegalArgumentException("Not a multicast address");
}
int port = Integer.parseInt(args[1]);
MulticastSocket sock = new MulticastSocket(port);
sock.joinGroup(address);
VoteMsgTextCoder coder = new VoteMsgTextCoder();
DatagramPacket packet = new DatagramPacket(new byte[VoteMsgTextCoder.MAX_WIRE_LENGTH],VoteMsgTextCoder.MAX_WIRE_LENGTH);
sock.receive(packet);
VoteMsg vote = coder.fromWire(Arrays.copyOfRange(packet.getData(), 0, packet.getLength()));
System.out.println("Received Text-Encoded Request ("+packet.getLength() + " bytes ):");
System.out.println(vote);
sock.close();
}
}
转载于:https://my.oschina.net/u/2552902/blog/543971