Java NIO实战之多人聊天室

2024-04-02 19:04:59 908人浏览安东尼

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摘要

本文实例为大家分享了Java NIO实战之多人聊天室的具体代码，供大家参考，具体内容如下 Nio服务端 public class NiOServer { pu

本文实例为大家分享了Java NIO实战之多人聊天室的具体代码，供大家参考，具体内容如下

Nio服务端


public class NiOServer {

    
    public void start() throws IOException {
        
        Selector selector = Selector.open();
        
        ServerSocketChannel serverSocketChannel = ServerSocketChannel.open();
        
        serverSocketChannel.bind(new InetSocketAddress(8000));
        
        serverSocketChannel.configureBlocking(false);
        
        serverSocketChannel.reGISter(selector, SelectionKey.OP_ACCEPT);
        System.out.println("服务器启动成功！");

        
        for (;;) { // while(true) c for;;
            
            int readyChannels = selector.select();

            
            if (readyChannels == 0) continue;

            
            Set<SelectionKey> selectionKeys = selector.selectedKeys();

            Iterator iterator = selectionKeys.iterator();

            while (iterator.hasNext()) {
                
                SelectionKey selectionKey = (SelectionKey) iterator.next();

                
                iterator.remove();

                
                
                if (selectionKey.isAcceptable()) {
                    acceptHandler(serverSocketChannel, selector);
                }

                
                if (selectionKey.isReadable()) {
                    readHandler(selectionKey, selector);
                }
            }
        }
    }

    
    private void acceptHandler(ServerSocketChannel serverSocketChannel,
                               Selector selector)
            throws IOException {
        
        SocketChannel socketChannel = serverSocketChannel.accept();

        
        socketChannel.configureBlocking(false);

        
        socketChannel.register(selector, SelectionKey.OP_READ);

        
        socketChannel.write(Charset.forName("UTF-8")
                .encode("你与聊天室里其他人都不是朋友关系，请注意隐私安全"));
    }

    
    private void readHandler(SelectionKey selectionKey, Selector selector)
            throws IOException {
        
        SocketChannel socketChannel = (SocketChannel) selectionKey.channel();

        
        ByteBuffer byteBuffer = ByteBuffer.allocate(1024);

        
        String request = "";
        while (socketChannel.read(byteBuffer) > 0) {
            
            byteBuffer.flip();

            
            request += Charset.forName("UTF-8").decode(byteBuffer);
        }

        
        socketChannel.register(selector, SelectionKey.OP_READ);

        
        if (request.length() > 0) {
            // 广播给其他客户端
            broadCast(selector, socketChannel, request);
        }
    }

    
    private void broadCast(Selector selector,
                           SocketChannel sourceChannel, String request) {
        
        Set<SelectionKey> selectionKeySet = selector.keys();

        
        selectionKeySet.forEach(selectionKey -> {
            Channel targetChannel = selectionKey.channel();

            // 剔除发消息的客户端
            if (targetChannel instanceof SocketChannel
                    && targetChannel != sourceChannel) {
                try {
                    // 将信息发送到targetChannel客户端
                    ((SocketChannel) targetChannel).write(
                            Charset.forName("UTF-8").encode(request));
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        });
    }

    
    public static void main(String[] args) throws IOException {
        new NioServer().start();
    }

}

NIO客户端


public class Nioclient {

    
    public void start(String nickname) throws IOException {
        
        SocketChannel socketChannel = SocketChannel.open(
                new InetSocketAddress("127.0.0.1", 8000));

        
        // 新开线程，专门负责来接收服务器端的响应数据
        // selector ， socketChannel ， 注册
        Selector selector = Selector.open();
        socketChannel.configureBlocking(false);
        socketChannel.register(selector, SelectionKey.OP_READ);
        new Thread(new NioClientHandler(selector)).start();

        
        Scanner scanner = new Scanner(System.in);
        while (scanner.hasNextLine()) {
            String request = scanner.nextLine();
            if (request != null && request.length() > 0) {
                socketChannel.write(
                        Charset.forName("UTF-8")
                                .encode(nickname + " : " + request));
            }
        }

    }
    public static void main(String[] args) throws IOException {
//        new NioClient().start();
    }
}

客户端线程，处理服务器端响应的的消息


public class NioClientHandler implements Runnable {
    private Selector selector;

    public NioClientHandler(Selector selector) {
        this.selector = selector;
    }

    @Override
    public void run() {

        try {
            for (;;) {
                int readyChannels = selector.select();

                if (readyChannels == 0) continue;

                
                Set<SelectionKey> selectionKeys = selector.selectedKeys();

                Iterator iterator = selectionKeys.iterator();

                while (iterator.hasNext()) {
                    
                    SelectionKey selectionKey = (SelectionKey) iterator.next();

                    
                    iterator.remove();

                    

                    
                    if (selectionKey.isReadable()) {
                        readHandler(selectionKey, selector);
                    }
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    
    private void readHandler(SelectionKey selectionKey, Selector selector)
            throws IOException {
        
        SocketChannel socketChannel = (SocketChannel) selectionKey.channel();

        
        ByteBuffer byteBuffer = ByteBuffer.allocate(1024);

        
        String response = "";
        while (socketChannel.read(byteBuffer) > 0) {
            
            byteBuffer.flip();

            
            response += Charset.forName("UTF-8").decode(byteBuffer);
        }

        
        socketChannel.register(selector, SelectionKey.OP_READ);

        
        if (response.length() > 0) {
            System.out.println(response);
        }
    }
}

我们定义三个客户端，模拟三个用户在聊天室发送消息


public class AClient {

    public static void main(String[] args)
            throws IOException {
        new NioClient().start("AClient");
    }
}

public class BClient {

    public static void main(String[] args)
            throws IOException {
        new NioClient().start("BClient");
    }
}

public class CClient {

    public static void main(String[] args)
            throws IOException {
        new NioClient().start("CClient");
    }

}

NIO 聊天室到此结束

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持编程网。

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