用java的AIO实现“剪刀石头布”的网络游戏的代码

以下是用Java AIO实现“剪刀石头布”网络游戏的代码示例：

import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.AsynchronousChannelGroup;
import java.nio.channels.AsynchronousServerSocketChannel;
import java.nio.channels.AsynchronousSocketChannel;
import java.nio.channels.CompletionHandler;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.Executors;

public class GameServer {
    private static final int PORT = 8888;
    private static final int BUFFER_SIZE = 1024;
    private static final String[] GESTURES = {"剪刀", "石头", "布"};
    private static final String[] RESULTS = {"平局", "胜利", "失败"};

    private static class Player {
        public AsynchronousSocketChannel channel;
        public ByteBuffer buffer;
        public int gesture = -1;
    }

    private static List<Player> players = new ArrayList<>();

    public static void main(String[] args) throws Exception {
        AsynchronousChannelGroup group = AsynchronousChannelGroup.withThreadPool(Executors.newFixedThreadPool(10));
        AsynchronousServerSocketChannel server = AsynchronousServerSocketChannel.open(group).bind(new InetSocketAddress(PORT));
        server.accept(null, new CompletionHandler<AsynchronousSocketChannel, Void>() {
            @Override
            public void completed(AsynchronousSocketChannel channel, Void attachment) {
                server.accept(null, this);
                Player player = new Player();
                player.channel = channel;
                player.buffer = ByteBuffer.allocate(BUFFER_SIZE);
                players.add(player);
                channel.read(player.buffer, player, new CompletionHandler<Integer, Player>() {
                    @Override
                    public void completed(Integer result, Player player) {
                        if (result == -1) {
                            removePlayer(player);
                        } else {
                            player.buffer.flip();
                            String message = new String(player.buffer.array(), 0, player.buffer.limit()).trim();
                            player.buffer.clear();
                            if (message.equals("剪刀") || message.equals("石头") || message.equals("布")) {
                                player.gesture = findGestureIndex(message);
                                if (isAllGestured()) {
                                    String resultMessage = getResultMessage();
                                    broadcast(resultMessage);
                                    resetGestures();
                                }
                            }
                            channel.read(player.buffer, player, this);
                        }
                    }

                    @Override
                    public void failed(Throwable exc, Player player) {
                        removePlayer(player);
                    }
                });
            }

            @Override
            public void failed(Throwable exc, Void attachment) {
                exc.printStackTrace();
            }
        });
        Thread.currentThread().join();
    }

    private static void removePlayer(Player player) {
        players.remove(player);
        try {
            player.channel.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private static int findGestureIndex(String gesture) {
        for (int i = 0; i < GESTURES.length; i++) {
            if (GESTURES[i].equals(gesture)) {
                return i;
            }
        }
        return -1;
    }

    private static boolean isAllGestured() {
        for (Player player : players) {
            if (player.gesture == -1) {
                return false;
            }
        }
        return true;
    }

    private static String getResultMessage() {
        int[] gestures = new int[players.size()];
        for (int i = 0; i < players.size(); i++) {
            gestures[i] = players.get(i).gesture;
        }
        int total = gestures.length;
        int[] counts = new int[GESTURES.length];
        for (int i = 0; i < total; i++) {
            counts[gestures[i]]++;
        }
        StringBuilder resultBuilder = new StringBuilder();
        for (int i = 0; i < total; i++) {
            int gesture1 = gestures[i];
            int winCount = 0;
            int drawCount = 0;
            for (int j = 0; j < total; j++) {
                if (i != j) {
                    int gesture2 = gestures[j];
                    int result = (gesture1 - gesture2 + GESTURES.length) % GESTURES.length;
                    if (result == 0) {
                        drawCount++;
                    } else if (result == 1 || result == 2) {
                        winCount++;
                    }
                }
            }
            resultBuilder.append("玩家").append(i + 1).append("出了").append(GESTURES[gesture1]);
            if (drawCount == total - 1) {
                resultBuilder.append(", 结果是平局");
            } else if (winCount == total - 1) {
                resultBuilder.append(", 结果是胜利");
            } else {
                resultBuilder.append(", 结果是失败");
            }
            resultBuilder.append("\n");
        }
        return resultBuilder.toString();
    }

    private static void resetGestures() {
        for (Player player : players) {
            player.gesture = -1;
        }
    }

    private static void broadcast(String message) {
        for (Player player : players) {
            try {
                player.channel.write(ByteBuffer.wrap(message.getBytes())).get();
            } catch (Exception e) {
                removePlayer(player);
            }
        }
    }
}

在这个示例中，我们使用`AsynchronousServerSocketChannel`来监听客户端连接，并使用`CompletionHandler`来处理连接、读取和写入操作。我们创建了一个`Player`类来表示每个玩家，并用一个`List`来保存所有玩家的信息。每当有一个新玩家连接时，我们会将其加入到`players`列表中，并开始异步读取其输入。如果读取到的输入是有效的手势（即“剪刀”、“石头”或“布”），则将其存储到相应的`Player`对象中，并检查是否已经收到了所有玩家的手势。如果是，则计算结果并将其广播给所有玩家。在处理读取和写入操作时，我们都需要检查是否有任何异常发生，并在发生异常时删除相应的`Player`对象。