nio(四)--socket与channel

NetWorkChannel:

 SelectorProvider provider=SelectorProvider.provider();        NetworkChannel socketChannel=provider.openSocketChannel();        SocketAddress address=new InetSocketAddress(3080);        Set<SocketOption<?>> socketOptions=socketChannel.supportedOptions();        System.out.println(socketOptions.toString());        socketChannel.setOption(StandardSocketOptions.IP_TOS,3);        boolean b=socketChannel.getOption(StandardSocketOptions.SO_KEEPALIVE);

MulticastChannel:

服务端： long t=1;        DatagramChannel dc=DatagramChannel.open(StandardProtocolFamily.INET);        dc.bind(null);        InetAddress group=InetAddress.getByName("224.0.0.5");        int port=9000;        while (true){            Thread.sleep(1000);            dc.send(ByteBuffer.wrap(("广播电视"+t++).getBytes()),new InetSocketAddress(group,port));        }客户端：        NetworkInterface networkInterface=NetworkInterface.getByName("lo");//选择网络接口        DatagramChannel dc=DatagramChannel.open(StandardProtocolFamily.INET);//打开数据包通道        dc.setOption(StandardSocketOptions.SO_REUSEADDR,true);//设置数据包通道        dc.bind(new InetSocketAddress(9000));//设置数据包通道端口        dc.setOption(StandardSocketOptions.IP_MULTICAST_IF,networkInterface);//绑定网络接口        InetAddress group=InetAddress.getByName("224.0.0.5");        MembershipKey key=dc.join(group,networkInterface);//加入多播组        ByteBuffer buffer=ByteBuffer.allocate(1024);        dc.receive(buffer);        System.out.println(new String(buffer.array()));        key.drop();        dc.close();