如何在NIO.2中实现多播客户端？

问题描述

使用Java 7 NIO.2多播客户端的示例如何？我只能在文档。

How would an example of using a Java 7 NIO.2 multicast client look like? I could only find half of an example in the MulticastChannel documentation.

推荐答案

此示例有效。请注意 DatagramChannel.join（）需要 NetworkInterface 才能工作。

This example works. Note that DatagramChannel.join() requires a NetworkInterface to work.

NetworkInterface ni = NetworkInterface.getByInetAddress(address);
InetAddress group = InetAddress.getByName("239.255.0.1")

DatagramChannel dc = DatagramChannel.open(StandardProtocolFamily.INET)
    .setOption(StandardSocketOptions.SO_REUSEADDR, true)
    .bind(new InetSocketAddress(5000))
    .setOption(StandardSocketOptions.IP_MULTICAST_IF, ni);
MembershipKey key = dc.join(group, ni);

ByteBuffer byteBuffer = ByteBuffer.allocate(1500);
while (true) {
    if (key.isValid()) {
        byteBuffer.clear();
        InetSocketAddress sa = (InetSocketAddress) dc.receive(byteBuffer);
        byteBuffer.flip();

        System.out.println("Multicast received from " + sa.getHostString());

        // TODO: Parse message
    }
}

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