MQTT发布订阅程序完整代码

工具类，包含有发布者方法和订阅者方法。

package ;

import .mqttv3.*;
import .;

import ;

/**
 * mqtt的发布和订阅
 *
 * @author wzq
 */
public class PublishSubscribe {


    private static String serviceURI = "tcp://172.16.22.160:1883";
    private static String clientID = ().toString();
    private static MqttClientPersistence persistence = new MemoryPersistence();
    //如果mqtt服务配置了匿名访问，则不需要使用用户名和密码就可以实现消息的订阅和发布
//    private static String username = "username";
//    private static String password = "password";
    private static String topic = "cebPark";
    /*
        消息服务质量，一共有三个：
        0：尽力而为。消息可能会丢，但绝不会重复传输
        1：消息绝不会丢，但可能会重复传输
        2：恰好一次。每条消息肯定会被传输一次且仅传输一次
     */
    private static int qos = 0;

    /**
     * 消息发布
     *
     * @author wzq
     **/
    public static void publish() {
        try {
            MqttClient client = new MqttClient(serviceURI, clientID, persistence);
            MqttConnectOptions connectOptions = new MqttConnectOptions();
//            (username);
//            (());
            (false);
            //发布者连接服务
            (connectOptions);
            ("发布者连接状态： " + ());
            MqttTopic mqttTopic = (topic);
            //MqttMessage mqttMessage = new MqttMessage(());
            MqttMessage mqttMessage = new MqttMessage();
            (qos);
            int i = 1;
            String message = "hello，智能公厕-";
            while (true) {
                String payLoad = message + i++;
                (());
                MqttDeliveryToken deliveryToken = (mqttMessage);
                if (!()) {
                    ("发布者发布消息： " + payLoad + " 失败");
                    ();
                } else {
                    ("发布者发布消息： " + payLoad + " 成功");
                }
            }
        } catch (Exception e) {
            ();
        }
    }

    /**
     * 消息订阅
     *
     * @author wzq
     **/
    public static void subscribe() {
        try {
            MqttClient client = new MqttClient(serviceURI, clientID, persistence);
            (new MqttCallback() {
                @Override
                public void connectionLost(Throwable cause) {
                    ("订阅者连接丢失...");
                    (());
                }

                @Override
                public void messageArrived(String topic, MqttMessage message) {
                    ("订阅者接收到消息： " + ());
                }

                @Override
                public void deliveryComplete(IMqttDeliveryToken token) {
                }
            });
            MqttConnectOptions connectOptions = new MqttConnectOptions();
//            (username);
//            (());
            (false);
            //订阅者连接订阅主题
            (connectOptions);
            (topic, qos);
            ("订阅者连接状态： " + ());
        } catch (MqttException e) {
            ();
        }

    }


}

发布者

package ;

/**
 * mqtt发布
 * @author: wzq
 * @time: 2018-07-27 16:43
 */
public class Publish {
    public static void main(String[] args) {
        ();
    }
}

订阅者

package ;

/**
 * mqtt订阅
 * @author: wzq
 * @time: 2018-07-27 16:43
 */
public class Subscribe {
    public static void main(String[] args) {
        ();
    }
}