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public class SReactorSThread {
    private Selector selector;
    private ServerSocketChannel serverSocketChannel;
    private int PORT = 6666;

    public SReactorSThread() {
        try {
            selector = Selector.open();
            serverSocketChannel = ServerSocketChannel.open();
            serverSocketChannel.bind(new InetSocketAddress(PORT));
            serverSocketChannel.configureBlocking(false);
            serverSocketChannel.register(selector, SelectionKey.OP_ACCEPT);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    //對客戶端進行監聽
    public void listen() {
        try {
            while (true) {
                int count = selector.select();
                //表示有客戶端產生事件
                if (count > 0) {
                    Set<SelectionKey> selectionKeys = selector.selectedKeys();
                    Iterator<SelectionKey> iterator = selectionKeys.iterator();
                    while (iterator.hasNext()) {
                        SelectionKey key = iterator.next();
                        dispatch(key);
                        iterator.remove();
                    }
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private void dispatch(SelectionKey key) {
        if (key.isAcceptable()){
            accept(key);
        }else {
            handler(key);
        }
    }

    //建立新的連接
    private void accept(SelectionKey key) {
        try {
            SocketChannel socketChannel = serverSocketChannel.accept();
            socketChannel.configureBlocking(false);
            socketChannel.register(selector, SelectionKey.OP_READ);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    //對請求進行處理，接收消息---業務處理---返回消息
    private void handler(SelectionKey key) {
        SocketChannel channel = null;
        try {
            channel = (SocketChannel) key.channel();
            ByteBuffer buffer = ByteBuffer.allocate(3);
            StringBuilder msg = new StringBuilder();
            while (channel.read(buffer) > 0) {
                msg.Append(new String(buffer.array()));
                buffer.clear();
            }
            System.out.println("接收到消息：" + msg.toString());
            String ok = "OK";
            buffer.put(ok.getBytes());
            buffer.flip();  
            channel.write(buffer);
            buffer.clear();
        } catch (IOException e) {
            try {
                System.out.println(channel.getRemoteAddress() + "離線了");
                key.cancel();
                channel.close();
            } catch (IOException ex) {
                ex.printStackTrace();
            }
        }
    }
}


public static void main(String[] args) {
    SReactorSThread sReactorSThread = new SReactorSThread();
    sReactorSThread.listen();
}