在netty中，我们如何发送任意长度不同的字符串消息？

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.Channel;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;

public class StringMessageHandler extends ChannelInboundHandlerAdapter {
    
    @Override
    public void channelActive(ChannelHandlerContext ctx) {
        String message = "Hello, Netty!";
        
        // 将字符串消息转换为字节数组
        byte[] messageBytes = message.getBytes();
        
        // 创建一个ByteBuf对象，并写入字节数组
        ByteBuf buf = Unpooled.buffer();
        buf.writeBytes(messageBytes);
        
        // 发送ByteBuf对象到远程服务器
        Channel channel = ctx.channel();
        channel.writeAndFlush(buf);
    }
    
    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) {
        // 处理接收到的消息
        ByteBuf buf = (ByteBuf) msg;
        byte[] messageBytes = new byte[buf.readableBytes()];
        buf.readBytes(messageBytes);
        String receivedMessage = new String(messageBytes);
        System.out.println("Received message: " + receivedMessage);
        
        // 继续处理其他逻辑
        // ...
    }
    
    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
        // 处理异常情况
        cause.printStackTrace();
        ctx.close();
    }
}