netty 编写mqtt服务端代码

Netty 是一个用于快速开发高性能网络应用程序的 Java NIO 的客户端/服务器框架。它具有良好的可扩展性，可以很容易地使用 Netty 来开发 MQTT 服务器。 以下是一个使用 Netty 开发 MQTT 服务器的示例代码： import io.netty.bootstrap.ServerBootstrap; import io.netty.channel.*; import io.netty.channel.nio.*; import io.netty.handler.codec.*; public class MqttServer { public static void main(String[] args) { EventLoopGroup bossGroup = new NioEventLoopGroup(); EventLoopGroup workerGroup = new NioEventLoopGroup(); try { ServerBootstrap b = new ServerBootstrap(); b .group(bossGroup, workerGroup) .channel(NioServerSocketChannel.class) .childHandler(new ChannelInitializer<SocketChannel>() { @Override public void initChannel(SocketChannel ch) throws Exception { ChannelPipeline pipeline = ch .pipeline(); pipeline .addLast("decoder", new MqttDecoder()); pipeline .addLast("encoder", new MqttEncoder()); // add your business logic here... } }); ChannelFuture f = b .bind(8080) // bind to the port 8080 .sync(); f .channel() // wait until the server socket is closed .closeFuture() // get notified when the socket is closed by the client and gracefully shutdown your server thread pool using shutdownGracefully() method of EventLoopGroups that was used while creating the ServerBootstrap instance in line no: 15 ..shutdownGracefully(); } finally { bossGroup  // shut down all event loops to terminate all threads..shutdownGracefully(); workerGroup  // shut down all event loops to terminate all threads..shutdownGracefully(); } } }