NIO问题

Question

有这么一段代码
private Selector selector;    public NioClient(String sip,int port) {
        try {
            InetSocketAddress ip = new InetSocketAddress(sip, port);
            SocketChannel channel = SocketChannel.open();
            System.out.println("begin connect");
            boolean flag = channel.connect(ip);
            if (flag) {
                channel.configureBlocking(false);
                selector = Selector.open();
                SelectionKey key = channel.register(selector, SelectionKey.OP_READ | SelectionKey.OP_WRITE);                key.attach(new ClientHandler());
            } 
        } catch (IOException ex) {
            Logger.getLogger(NioClient.class.getName()).log(Level.SEVERE, null, ex);
            System.exit(0);
        }
    }SelectionKey.OP_READ | SelectionKey.OP_WRITE在那句代码中时什么意思了？

Answer 1

同时监视OP_READ和OP_WRITE事件。

Answer 2

哦 那这样写可以吗
channel.register(selector, SelectionKey.OP_READ);
channel.register(selector,SelectionKey.OP_WRITE); 

Answer 3

也可以的，但这样得到的就是2个Key了，一起写得到的是1个Key.