如何使用 Java 进行高效的网络通信

// 创建服务器套接字
ServerSocket serverSocket = new ServerSocket(8080);

// 等待客户端连接
Socket clientSocket = serverSocket.accept();

// 发送数据到客户端
OutputStream os = clientSocket.getOutputStream();
os.write("Hello, client!".getBytes());

// 接收数据来自客户端
InputStream is = clientSocket.getInputStream();
byte[] buffer = new byte[1024];
int readBytes = is.read(buffer);
String message = new String(buffer, 0, readBytes);

// 关闭连接
clientSocket.close();

// 创建一个 Selector
Selector selector = Selector.open();

// 创建一个 ServerSocketChannel 并注册到 Selector
ServerSocketChannel serverSocketChannel = ServerSocketChannel.open();
serverSocketChannel.socket().bind(new InetSocketAddress(8080));
serverSocketChannel.configureBlocking(false);
serverSocketChannel.register(selector, SelectionKey.OP_ACCEPT);

// 轮询 Selector
while (true) {
    int selected = selector.select();
    Set<SelectionKey> selectedKeys = selector.selectedKeys();
    Iterator<SelectionKey> keyIterator = selectedKeys.iterator();

    while (keyIterator.hasNext()) {
        SelectionKey key = keyIterator.next();
        keyIterator.remove();

        if (key.isAcceptable()) {
            // 处理传入连接
        } else if (key.isReadable()) {
            // 处理读操作
        } else if (key.isWritable()) {
            // 处理写操作
        }
    }
}