Docker+ActiveMQ+MQTT例子

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1.启动容器:docker run -p 1883:1883 -p 8161:8161 -d leo/activemq

如果没有Docker,直接启动ActiveMQ也可以.

ActiveMQ启动好后,我们只需要写好publisher和subscriber就好了.

2.需要添加2个maven依赖:

<dependency><groupId>org.apache.activemq</groupId><artifactId>activemq-all</artifactId><version>5.13.3</version></dependency><dependency><groupId>org.eclipse.paho</groupId><artifactId>org.eclipse.paho.client.mqttv3</artifactId><version>1.1.0</version></dependency>

第一个依赖是activemq的,

第二个依赖的详情,请参考:https://eclipse.org/paho/clients/java/

3.Publisher代码如下:

package leo.mqtt;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.persist.MemoryPersistence;public class Publisher {public static void main(String[] args) {String topic = "TopicOfLeo";String content = "Hello Leo!";int qos = 1;//0:msg只发1次,并且不需要确认.  1:msg至少发1次,需要确认.   2.发且仅发1次,并且需要进行4次挥手.String broker = "tcp://127.0.0.1:1883";String clientId = "publisher1";MemoryPersistence persistence = new MemoryPersistence();try {MqttClient client = new MqttClient(broker, clientId, persistence);MqttConnectOptions connOpts = new MqttConnectOptions();connOpts.setCleanSession(false);//第一次启动是否清除sessionclient.connect(connOpts);MqttMessage message = new MqttMessage(content.getBytes());message.setQos(qos);client.publish(topic, message);client.disconnect();System.exit(0);} catch (MqttException me) {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();}}}

4.subscriber代码如下:

package leo.mqtt;import org.eclipse.paho.client.mqttv3.IMqttMessageListener;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.persist.MemoryPersistence;public class Subscriber {public static void main(String[] args) {String topic = "TopicOfLeo";String broker = "tcp://127.0.0.1:1883";String clientId = "Subscriber1";MemoryPersistence persistence = new MemoryPersistence();try {MqttClient client = new MqttClient(broker, clientId, persistence);MqttConnectOptions connOpts = new MqttConnectOptions();connOpts.setCleanSession(false);client.connect(connOpts);client.subscribe(topic, new IMqttMessageListener() {@Overridepublic void messageArrived(String topic, MqttMessage message) throws Exception {System.out.println(topic + " -> " + message);}});} catch (MqttException me) {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();}}}

5.先运行subscriber,再运行publisher,即可看到效果.

入门demo到此结束.

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