netty+mqtt

package io.mqtt.server;

import io.mqtt.tool.ConfigService;
import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.Channel;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.util.internal.logging.InternalLogger;
import io.netty.util.internal.logging.InternalLoggerFactory;
import io.netty.util.internal.logging.Log4JLoggerFactory;

import java.util.ArrayList;
import java.util.List;

public class Server {
    private static final InternalLogger logger = InternalLoggerFactory
            .getInstance(Server.class);

    private int port;
    //    private final int port = ConfigService.getIntProperty(“tcp.port”, 1883);
    private final int httpPort = ConfigService
            .getIntProperty(“http.port”, 8080);

    private List<Channel> channels = new ArrayList<Channel>();
    private EventLoopGroup bossGroup = new NioEventLoopGroup(1);
    private EventLoopGroup workerGroup = new NioEventLoopGroup();

    public Server(int port) {
        this.port = port;
    }

    private ServerBootstrap getDefaultServerBootstrap() {
        ServerBootstrap server = new ServerBootstrap();
        server.group(bossGroup, workerGroup)
                .option(ChannelOption.SO_BACKLOG, 1000)
                .option(ChannelOption.TCP_NODELAY, true)
                .channel(NioServerSocketChannel.class)
                .childOption(ChannelOption.SO_KEEPALIVE, true);
        return server;
    }

    public ChannelFuture run() throws Exception {
        InternalLoggerFactory.setDefaultFactory(new Log4JLoggerFactory());

        Channel channle = getDefaultServerBootstrap()
                .childHandler(new TcpChannelInitializer()).bind(port).sync()
                .channel();
        channels.add(channle);

        logger.info(“mqtt.io tcp server started at port ” + port + ‘.’);

        ChannelFuture future = getDefaultServerBootstrap().childHandler(
                new HttpChannelInitializer()).bind(httpPort);

        Channel httpChannel = future.sync().channel();
        channels.add(httpChannel);

        logger.info(“mqtt.io websocket server started at port ” + httpPort
                + ‘.’);

        return future;
    }

    public void destroy() {
        logger.info(“destroy mqtt.io server …”);
        for (Channel channel : channels) {
            channel.close();
        }
        bossGroup.shutdownGracefully();
        workerGroup.shutdownGracefully();
    }

    public static void main(String[] args) throws Exception {
//        for (int i = 0; i < 5; i++) {
            new ServerThread(65432 + (0 * 2)).start();
//        }
    }

}

package io.mqtt.handler;

import io.mqtt.processer.ConnectProcesser;
import io.mqtt.processer.DisConnectProcesser;
import io.mqtt.processer.PingReqProcesser;
import io.mqtt.processer.PublishProcesser;
import io.mqtt.processer.SubscribeProcesser;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.handler.timeout.ReadTimeoutException;

import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import io.mqtt.processer.*;
import org.meqantt.message.ConnAckMessage;
import org.meqantt.message.ConnAckMessage.ConnectionStatus;
import org.meqantt.message.DisconnectMessage;
import org.meqantt.message.Message;
import org.meqantt.message.Message.Type;
import org.meqantt.message.PingRespMessage;

public class MqttMessageHandler extends ChannelInboundHandlerAdapter {
    private static PingRespMessage PINGRESP = new PingRespMessage();

    private static final Map<Message.Type, Processer> processers;
    static {
        Map<Message.Type, Processer> map = new HashMap<Message.Type, Processer>(
                6);

        map.put(Type.CONNECT,  new ConnectProcesser());
        map.put(Type.PUBLISH,  new PublishProcesser());
        map.put(Type.SUBSCRIBE, (Processer) new SubscribeProcesser());
        map.put(Type.UNSUBSCRIBE, (Processer) new UnsubscribeProcesser());
        map.put(Type.PINGREQ, new PingReqProcesser());
        map.put(Type.DISCONNECT, (Processer) new DisConnectProcesser());

        processers = Collections.unmodifiableMap(map);
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable e)
            throws Exception {
        try {
            if (e.getCause() instanceof ReadTimeoutException) {
                ctx.write(PINGRESP).addListener(
                        ChannelFutureListener.CLOSE_ON_FAILURE);
            } else {
                ctx.channel().close();
            }
        } catch (Throwable t) {
            t.printStackTrace();
            ctx.channel().close();
        }

        e.printStackTrace();
    }

    @Override
    public void channelRead(ChannelHandlerContext ctx, Object obj)
            throws Exception {
        //MQTT MESSAGE
        Message msg = (Message) obj;
        // server收到clinet 的MQTT数据包，并获取MQTT的消息类型
        Processer p = processers.get(msg.getType());
        if (p == null) {
            return;
        }
        //根据特定消息类型解析消息包
        Message rmsg = p.proc(msg, ctx);
        if (rmsg == null) {
            return;
        }
        //根据消息处理结果，向clinet做出回应
        if (rmsg instanceof ConnAckMessage
                && ((ConnAckMessage) rmsg).getStatus() != ConnectionStatus.ACCEPTED) {
            ctx.write(rmsg).addListener(ChannelFutureListener.CLOSE);
        } else if (rmsg instanceof DisconnectMessage) {
            ctx.write(rmsg).addListener(ChannelFutureListener.CLOSE);
        } else {
            ctx.write(rmsg).addListener(ChannelFutureListener.CLOSE_ON_FAILURE);
        }
    }

    @Override
    public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {
        ctx.flush();
    }
}

//client

package com.test.client;

import org.eclipse.paho.client.mqttv3.*;

public class SubscribeMessage implements MqttCallback {

    private MqttClient client;

    public SubscribeMessage() {
    }

    public static void main(String[] args) {
//        String tcpUrl = “tcp://127.0.0.1:1883”;
//        String clientId = “sub-msg/client1”;
//        String topicName = “sub/client1”;
//
//        new SubscribeMessage().doDemo(tcpUrl, clientId, topicName);
//        for (int j = 0; j < 5; j++) {
            for (int i = 0; i < 10000; i++) {
        new SubscribeThread(“client_” + 0 + i, “tcp://127.0.0.1:” + (65432 + 0 * 2)).start();
            }
//        }

    }

    public void doDemo(String tcpUrl, String clientId, String topicName) {
        try {
            client = new MqttClient(tcpUrl, clientId);
            MqttConnectOptions mqcConf = new MqttConnectOptions();
            mqcConf.setConnectionTimeout(300);
            mqcConf.setKeepAliveInterval(1000);
            client.connect(mqcConf);
            client.setCallback(this);
            client.subscribe(topicName);
        } catch (MqttException e) {
            e.printStackTrace();
        }
    }

    public void connectionLost(Throwable cause) {
        cause.printStackTrace();
    }

    public void messageArrived(String topic, MqttMessage message)
            throws Exception {
        System.out.println(“[GOT PUBLISH MESSAGE] : ” + message);
    }

    public void deliveryComplete(IMqttDeliveryToken token) {
    }
}

 转自：https://www.cnblogs.com/yfliufei/p/4463538.html