用Java的NIO技术写一个Knock Knock小游戏的客户机/服务器设计代码

好的，以下是一个基于Java NIO技术的Knock Knock小游戏的客户端/服务器端设计代码。

首先，我们需要定义一些常量和变量：

public class KnockKnockServer {
    private static final int PORT = 8080;
    private Selector selector;
    private ByteBuffer buffer = ByteBuffer.allocate(256);
    private Map<SocketChannel, String> clientResponses = new HashMap<>();
    private Map<SocketChannel, Integer> clientStates = new HashMap<>();
    private Map<SocketChannel, Queue<String>> clientQueues = new HashMap<>();
    private ServerSocketChannel serverChannel;
    private int state = 0;
    private String[] jokes = {"Knock, knock.", "Who’s there?", "Boo.", "Boo who?", "Don’t cry. It’s only a joke."};
}

然后，我们创建一个初始化方法，用于创建服务器端的SocketChannel和Selector对象：

private void init() throws IOException {
    selector = Selector.open();
    serverChannel = ServerSocketChannel.open();
    serverChannel.configureBlocking(false);
    serverChannel.socket().bind(new InetSocketAddress(PORT));
    serverChannel.register(selector, SelectionKey.OP_ACCEPT);
}

接下来，我们需要实现一个方法，用于处理客户端连接请求：

private void accept(SelectionKey key) throws IOException {
    SocketChannel client = serverChannel.accept();
    client.configureBlocking(false);
    client.register(selector, SelectionKey.OP_READ);
    clientQueues.put(client, new LinkedList<>());
    clientStates.put(client, 0);
    System.out.println("Accepted new connection from " + client.getRemoteAddress());
}

然后，我们需要实现一个方法，用于处理客户端的读取请求：

private void read(SelectionKey key) throws IOException {
    SocketChannel client = (SocketChannel) key.channel();
    buffer.clear();
    int read = client.read(buffer);
    if (read == -1) {
        client.close();
        return;
    }
    buffer.flip();
    String clientResponse = new String(buffer.array(), 0, read);
    System.out.println("Received: " + clientResponse + " from " + client.getRemoteAddress());
    clientResponses.put(client, clientResponse);
    processClientResponse(client);
    key.interestOps(SelectionKey.OP_WRITE);
}

然后，我们需要实现一个方法，用于处理客户端的写入请求：

private void write(SelectionKey key) throws IOException {
    SocketChannel client = (SocketChannel) key.channel();
    Queue<String> queue = clientQueues.get(client);
    if (queue.isEmpty()) {
        key.interestOps(SelectionKey.OP_READ);
        return;
    }
    String message = queue.poll();
    ByteBuffer buffer = ByteBuffer.wrap(message.getBytes());
    client.write(buffer);
    System.out.println("Sent: " + message + " to " + client.getRemoteAddress());
}

接下来，我们需要实现一个方法，用于处理客户端的响应：

private void processClientResponse(SocketChannel client) throws IOException {
    String response = clientResponses.get(client);
    int currentState = clientStates.get(client);
    switch (currentState) {
        case 0:
            if (!response.equals("Knock, knock.")) {
                clientQueues.get(client).offer("You're supposed to say \"Knock, knock.\" Try again.\n");
            } else {
                clientStates.put(client, 1);
                clientQueues.get(client).offer("Who's there?\n");
            }
            break;
        case 1:
            if (!response.equals("Boo.")) {
                clientQueues.get(client).offer("You're supposed to say \"Boo.\" Try again.\n");
            } else {
                clientStates.put(client, 2);
                clientQueues.get(client).offer("Boo who?\n");
            }
            break;
        case 2:
            if (!response.equals("Don't cry. It's only a joke.")) {
                clientQueues.get(client).offer("You're supposed to say \"Don't cry. It's only a joke.\" Try again.\n");
            } else {
                clientStates.put(client, 0);
                clientQueues.get(client).offer("Knock, knock.\n");
            }
            break;
    }
}

最后，我们需要实现一个方法，用于运行服务器：

public void run() throws IOException {
    init();
    while (true) {
        selector.select();
        Iterator<SelectionKey> keys = selector.selectedKeys().iterator();
        while (keys.hasNext()) {
            SelectionKey key = keys.next();
            keys.remove();
            if (!key.isValid()) {
                continue;
            }
            if (key.isAcceptable()) {
                accept(key);
            } else if (key.isReadable()) {
                read(key);
            } else if (key.isWritable()) {
                write(key);
            }
        }
    }
}

以上就是基于Java NIO技术的Knock Knock小游戏的客户端/服务器端设计代码，希望对你有帮助！