Java 组播

最新推荐文章于 2024-11-14 09:25:12 发布

原创最新推荐文章于 2024-11-14 09:25:12 发布 · 575 阅读

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#java 多播

本文将介绍如何使用Java实现多播接收与发送的功能，包括创建多播socket、加入组、接收数据包和发送数据包的过程。

1. receive

        int port = 1234;
        String address = "224.0.0.1";
        byte[] data = new byte[256];

        try {
            InetAddress ip = InetAddress.getByName(address);
            MulticastSocket ms = new MulticastSocket(port);
            ms.joinGroup(ip);

DatagramPacket packet = new DatagramPacket(data, data.length);
ms.receive(packet);

            String message = new String(packet.getData(), 0, packet.getLength());
            System.out.println(message);
            ms.close();
        } catch (Exception e) {
            e.printStackTrace();
        }

2. send

       int port = 1234;
        String address = "224.0.0.1";
        String data = "Hello Multicast";

        try {
            InetAddress ip = InetAddress.getByName(address);
            DatagramPacket packet = new DatagramPacket(data.getBytes(),
                                                       data.length(), ip, port);
            MulticastSocket ms = new MulticastSocket();
            ms.send(packet);
            ms.close();
        } catch (Exception e) {
            e.printStackTrace();
        }