paho-mqtt-client

<dependency>
    <groupId>net.oschina.durcframework</groupId>
    <artifactId>paho-mqtt-client</artifactId>
    <version>1.0.0</version>
</dependency>

PahoMqttClient mqttClient = PahoMqttClient.create()
    .broker(broker)
    .auth(username, password)
    .clientId(clientId)
    .cleanSession(true)
    // 自动重连
    .automaticReconnect(true)
    // 订阅消息
    .subscribe(topic, 2)
    // 设置回调，处理消息    
    .callback(new MyMqttCallback())
    .connect();


public static class MyMqttCallback extends PahoMqttCallback {

    @Override
    public void connectionLost(Throwable throwable) {
        System.out.println("[client]失去连接:" + throwable.getMessage());
    }

    @Override
    public void messageArrived(String topic, MqttMessage mqttMessage) throws Exception {
        System.out.println("[client]收到消息： topic:" + topic + ", msg:" + mqttMessage.toString());
    }

    @Override
    public void deliveryComplete(IMqttDeliveryToken iMqttDeliveryToken) {

    }
}

mqttClient.publish(upLocationTopic, location.getBytes(), 1);

package com.gitee.mqttclient;

import com.gitee.mqttclient.callback.PahoMqttCallback;
import com.gitee.mqttclient.client.PahoMqttClient;
import org.eclipse.paho.client.mqttv3.IMqttDeliveryToken;
import org.eclipse.paho.client.mqttv3.MqttException;
import org.eclipse.paho.client.mqttv3.MqttMessage;
import org.junit.Test;

import java.util.concurrent.TimeUnit;

/**
 * 模拟平台端
 * @author thc
 */
public class ServerTest {

    protected static String broker = "tcp://1.1.1.1:1883";
    protected static String username = "s001";
    protected static String password = "123456";

    static PahoMqttClient mqttClient;


    /**
     * 启动平台端
     * @throws InterruptedException
     * @throws MqttException
     */
    @Test
    public void server() throws InterruptedException, MqttException {
        String clientId = "server-node-1";
        // 平台端监听所有车型定位topic
        String topic = "prod/+/+/base/location/#";
        mqttClient = PahoMqttClient.create()
                .broker(broker)
                .auth(username, password)
                .clientId(clientId)
                .cleanSession(true)
                // 自动重连
                .automaticReconnect(true)
                // 订阅消息
                .subscribe(topic, 1)
                .callback(new ServerMqttCallback())
                .connect();

        // 另起一个线程，进行指令下发
        new Thread(() -> {
            // 每隔20秒对A000001这辆车进行OTA升级
            String downTopic = "o2o/A000001/ota";
            while (true) {
                String otaContent = String.valueOf(System.currentTimeMillis());
                System.out.println("发送ota指令:" + otaContent);
                byte[] otaFile = otaContent.getBytes();
                try {
                    mqttClient.publish(downTopic, otaFile, 2);
                } catch (MqttException e) {
                    throw new RuntimeException(e);
                }
                try {
                    TimeUnit.SECONDS.sleep(20);
                } catch (InterruptedException e) {
                    throw new RuntimeException(e);
                }
            }
        }).start();

        TimeUnit.DAYS.sleep(1);
    }

    /**
     * 服务端接收消息回调
     */
    public static class ServerMqttCallback extends PahoMqttCallback {

        @Override
        public void connectionLost(Throwable throwable) {
            System.out.println("[server]失去连接:" + throwable.getMessage());
        }

        @Override
        public void messageArrived(String topic, MqttMessage mqttMessage) throws Exception {
            System.out.println("[server]收到消息： topic:" + topic + ", msg:" + mqttMessage.toString());
        }

        @Override
        public void deliveryComplete(IMqttDeliveryToken iMqttDeliveryToken) {

        }
    }

}

package com.gitee.mqttclient;

import com.gitee.mqttclient.callback.PahoMqttCallback;
import com.gitee.mqttclient.client.PahoMqttClient;
import org.eclipse.paho.client.mqttv3.IMqttDeliveryToken;
import org.eclipse.paho.client.mqttv3.MqttException;
import org.eclipse.paho.client.mqttv3.MqttMessage;
import org.junit.Test;

import java.util.Random;
import java.util.concurrent.TimeUnit;

/**
 * 模拟设备端，汽车终端
 * @author thc
 */
public class ClientTest {

    protected static String broker = "tcp://1.1.1.1:1883";
    protected static String username = "u001";
    protected static String password = "123456";

    // 汽车类型
    static String carType = "suv";
    // 车架号
    static String vin = "A000001";

    // 格式：client-用户名-车架号
    static String clientId = "client-" + username + "-" + vin;


    private static PahoMqttClient mqttClient;

    private void init() throws MqttException {
        // 订阅点对点消息
        String topic = "o2o/" + vin + "/+";
        mqttClient = PahoMqttClient.create()
                .broker(broker)
                .auth(username, password)
                .clientId(clientId)
                .cleanSession(true)
                // 自动重连
                .automaticReconnect(true)
                // 订阅消息
                .subscribe(topic, 2)
                .callback(new MyMqttCallback())
                .connect();
    }

    @Test
    public void device() throws InterruptedException {
        try {
            init();
        } catch (MqttException me) {
            System.err.println("MQTT连接失败");
            System.out.println("reason " + me.getReasonCode());
            System.out.println("msg " + me.getMessage());
            System.out.println("loc " + me.getLocalizedMessage());
            System.out.println("cause " + me.getCause());
            System.out.println("excep " + me);
            me.printStackTrace();
            return;
        }

        // 另起一个线程，上报信息
        new Thread(() -> {
            // 上报定位topic
            String upLocationTopic = String.format("prod/%s/%s/base/location", carType, vin);

            // 每隔10秒上报一次定位信息
            while (true) {
                try {
                    // 随机经纬度
                    String lon = "120.123" + new Random().nextInt(100);
                    String lat = "30.123" + new Random().nextInt(100);
                    String location = lon + "," + lat;
                    System.out.println("上报定位信息:" + location);
                    // 上报经纬度
                    mqttClient.publish(upLocationTopic, location.getBytes(), 1);
                } catch (MqttException e) {
                    throw new RuntimeException(e);
                }
                try {
                    TimeUnit.SECONDS.sleep(10);
                } catch (InterruptedException e) {
                    throw new RuntimeException(e);
                }
            }
        }).start();

        // stop here
        TimeUnit.DAYS.sleep(1);
    }

    public static class MyMqttCallback extends PahoMqttCallback {

        @Override
        public void connectionLost(Throwable throwable) {
            System.out.println("[client]失去连接:" + throwable.getMessage());
        }

        @Override
        public void messageArrived(String topic, MqttMessage mqttMessage) throws Exception {
            System.out.println("[client]收到消息： topic:" + topic + ", msg:" + mqttMessage.toString());
        }

        @Override
        public void deliveryComplete(IMqttDeliveryToken iMqttDeliveryToken) {

        }
    }


}