UDP组播代码

UDP组播发送端:

 1     public static void main(String[] args) throws IOException {
 2         DatagramSocket socket = new DatagramSocket();
 3 //组播地址224.0.0.0——239.255.255.255
 4         //其中224.0.0.0——224.0.0.255为预留的组播地址
 5         // 所以我们使用组播地址要从224.0.1.0开始
 6         String s = "Hello,组播";
 7         byte[] bytes = s.getBytes();
 8         InetAddress address = InetAddress.getByName("224.0.1.255");
 9         DatagramPacket packet = new DatagramPacket(bytes, bytes.length, address, 1026);
10 
11         socket.send(packet);
12         socket.close();
13 
14 
15     }

 

UDP组播接收端:

 1     public static void main(String[] args) throws IOException {
 2         MulticastSocket socket = new MulticastSocket(1026);//和单播创建邮局不一样注意
 3         byte[] bytes = new byte[1024];
 4         DatagramPacket packet = new DatagramPacket(bytes, bytes.length);
 5         socket.joinGroup(InetAddress.getByName("224.0.1.255"));//相当于单播中的电脑IP
 6         socket.receive(packet);
 7         byte[] data = packet.getData();
 8         int length = packet.getLength();
 9         System.out.println(new String(data, 0, length));
10 
11         socket.close();
12 
13     }

需要注意的是:

组播地址224.0.0.0——239.255.255.255 其中224.0.0.0——224.0.0.255为预留的组播地址,所以我们使用组播地址要从224.0.1.0开始

 

posted @ 2020-08-18 10:19  Joker-0927  阅读(731)  评论(0编辑  收藏  举报
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