Java连接MQTT服务-tcp方式

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1、Java代码

 package com.mao.mqtt;

 import java.text.SimpleDateFormat;
 import java.util.Date;

 import org.eclipse.paho.client.mqttv3.IMqttDeliveryToken;
 import org.eclipse.paho.client.mqttv3.MqttCallback;
 import org.eclipse.paho.client.mqttv3.MqttClient;
 import org.eclipse.paho.client.mqttv3.MqttConnectOptions;
 import org.eclipse.paho.client.mqttv3.MqttException;
 import org.eclipse.paho.client.mqttv3.MqttMessage;
 import org.eclipse.paho.client.mqttv3.MqttTopic;

 /**
  *
  * 功能描述：MQTT测试
  * 创建人： mao2080@sina.com
  * 创建时间：2017年7月4日 下午5:08:59
  * 修改人： mao2080@sina.com
  * 修改时间：2017年7月4日 下午5:08:59
  */
 public class MQTTTest_tcp {

     /**MQTT服务端ip及端口*/
     private static String host = "tcp://ip:1883";

     /**账号*/
     private static String username = "li2080";

     /**密码*/
     private static String password = "123";

     /**订阅的主题*/
     private static String subTopic = "a/b/c";

     /**clientID*/
     private static String clientId = "li2080";

     /**发布的主题*/
     private static String pubTopic = "a/b/c";

     /**MQTT-Client*/
     private static MqttClient client;

     /**MQTT-Client*/
     private static int uuid = 0;

     /**
      * @throws InterruptedException
      * @throws MqttException */
     public static void main(String[] args) throws InterruptedException, MqttException {

         // 订阅消息的方法
         subscribe();
 //
         publish();
     }

     /**
      *
      * 描述：订阅信息
      * @author mao2080@sina.com
      * @created 2017年7月4日 下午4:53:47
      * @since
      * @return
      */
     public static void subscribe() {
         try {
             // 创建MqttClient
             MQTTTest_tcp.getClient().setCallback(new MqttCallback() {

                 public void connectionLost(Throwable arg0) {

                 }

                 public void messageArrived(String topic, MqttMessage message) throws Exception {
                     System.out.println("MQTT Rece:" + message.toString());
                 }

                 public void deliveryComplete(IMqttDeliveryToken token) {

                 }

             });
             MQTTTest_tcp.getClient().subscribe(subTopic, 0);
             System.out.println("连接状态:" + client.isConnected());
         } catch (Exception e) {
             e.printStackTrace();
         }
     }

     /**
      *
      * 描述：获取MqttClient
      * @author mao2080@sina.com
      * @created 2017年7月6日 上午9:56:37
      * @since
      * @return
      * @throws MqttException
      */
     public static MqttClient getClient() throws MqttException{
         try {
             if(client == null){
                 client = new MqttClient(host, clientId);
                 MqttConnectOptions conOptions = new MqttConnectOptions();
                 conOptions.setUserName(username);
                 conOptions.setPassword(password.toCharArray());
                 conOptions.setCleanSession(true);
                 client.connect(conOptions);
             }
             if(!client.isConnected()){
                 client.reconnect();
             }
         } catch (Exception e) {
             e.printStackTrace();
         }
         return client;
     }

     /**
      *
      * 描述：发布信息
      * @author mao2080@sina.com
      * @throws MqttException
      * @created 2017年7月4日 下午4:53:32
      * @since
      */
     public static void publish() throws MqttException {
         SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
         String sendMsg = "{time:"+sdf.format(new Date())+", content:"+com.lds.iot.common.util.UUIDUtil.getLowerLetterNumber(15)+", from: java console}";
         try {
             MqttTopic topic = MQTTTest_tcp.getClient().getTopic(pubTopic);
             MqttMessage message = new MqttMessage(sendMsg.getBytes());
             message.setQos(0);
             topic.publish(message);
             System.out.println("MQTT Send:" + sendMsg);
         } catch (Exception e) {
             e.printStackTrace();
         }
     }

 }

2、Maven配置

 <dependency>
       <groupId>org.eclipse.paho</groupId>
       <artifactId>org.eclipse.paho.client.mqttv3</artifactId>
       <version>1.2.0</version>
 </dependency>

3、运行效果