帮我写一个socketchannel通信案例，用java语言

好的！以下是一个简单的Socketchannel通信案例：

import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.SocketChannel;

public class SocketChannelExample {
    public static void main(String[] args) {
        try {
            // 创建SocketChannel并连接到服务端
            SocketChannel socketChannel = SocketChannel.open();
            socketChannel.connect(new InetSocketAddress(8080));
            
            // 发送数据给服务端
            String message = "Hello, Server!";
            ByteBuffer buffer = ByteBuffer.wrap(message.getBytes());
            socketChannel.write(buffer);
            
            // 接收服务端返回的数据
            ByteBuffer receiveBuffer = ByteBuffer.allocate(1024);
            int bytesRead = socketChannel.read(receiveBuffer);
            String response = new String(receiveBuffer.array(), 0, bytesRead);
            System.out.println("Server response: " + response);
            
            // 关闭SocketChannel
            socketChannel.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

这是一个简单的客户端主动连接服务端，发送数据并接收服务端返回数据的示例。在实际应用中，需要考虑SocketChannel的异常处理、消息格式协议等问题。