1. Selector selector = Selector.open();

2. ServerSocketChannel ssc = ServerSocketChannel.open();

3. ssc.bind(new InetSocketAddress(8000));

4. ssc.configureBlocking(false);

5. ssc.register(selector, SelectionKey.OP_ACCEPT);

6. for(;;){

7. }
   

选择器与channel的交互，监听channel集合

NIO服务端1234