Working with Multicast Sockets

转载于 2012-09-13 18:17:04 发布 · 673 阅读

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本文详细介绍了如何使用UDP协议进行多播数据的发送与接收操作，包括创建多播socket、设置时间生存期、发送与接收数据包等关键步骤。

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	public static void send() throws IOException {
		
		InetAddress ia = InetAddress.getByName("239.12.2.2");
		byte[] data = "Here's some multicast data\r\n".getBytes();
		int port = 5555;
		byte ttl = 1;
		DatagramPacket dp = new DatagramPacket(data, data.length,ia,port);
		
		MulticastSocket  ms  = new MulticastSocket();
		
		ms.joinGroup(ia);
		boolean b = true;
		while(b) {
			ms.setTimeToLive(ttl); 
			ms.send(dp);
		}
		ms.leaveGroup(ia);
		ms.close();
	}

private static void receiveUDPContent() throws UnknownHostException,
			IOException {
		InetAddress group = InetAddress.getByName("239.12.2.2");
		int port = 5555;
		MulticastSocket ms = null;
		try {
			ms = new MulticastSocket(port);
			ms.joinGroup(group);
			while (true) {
				byte[] buf = new byte[1024];
				DatagramPacket packet = new DatagramPacket(buf, buf.length);
				ms.receive(packet);// blocking
				byte[] content = packet.getData();
				System.err.println(new String (content));
			}
		} finally {
			if (ms != null) {
				ms.leaveGroup(group);
				ms.close();
			}
		}
	}