我们将首先以 TCP 连接为例,设置 MQTT 服务器的基本连接信息。 String broker = "tcp://broker.emqx.io:1883"; String clientId = "demo_client"; 创建MQTT 连接 这里将创建同步客户端(MqttClient),使用刚才设置的参数连接到 MQTT Broker 上。 MqttClient client = new MqttClient(broker, clientId); Mqtt...
这段代码创建了一个MqttClientExample类,并在构造函数中初始化MQTT客户端。 3. 实现连接到MQTT Broker 现在,我们需要实现连接到MQTT Broker的功能: importorg.eclipse.paho.client.mqttv3.MqttConnectOptions;publicvoidconnect()throwsMqttException{MqttConnectOptionsoptions=newMqttConnectOptions();// 设置清洁会话,确保...
importorg.eclipse.paho.client.mqttv3.*;importorg.eclipse.paho.client.mqttv3.persist.MemoryPersistence;publicclassMqttExample{publicstaticvoidmain(String[]args){Stringbroker="tcp://broker.hivemq.com:1883";StringclientId="JavaSample";MemoryPersistencepersistence=newMemoryPersistence();try{MqttClientclient=...
import org.eclipse.paho.client.mqttv3.MqttClientPersistence; import org.eclipse.paho.client.mqttv3.MqttConnectOptions; import org.eclipse.paho.client.mqttv3.MqttDeliveryToken; import org.eclipse.paho.client.mqttv3.MqttException; import org.eclipse.paho.client.mqttv3.MqttMessage; import org.eclipse.pah...
The Java client used here supports MQTT v3.1, v3.1.1 and v5. You can find documentation for this client library here: https://www.hivemq.com/blog/mqtt-client-library-encyclopedia-eclipse-paho-java/.This example repository is easily and clearly structured, so you can start quickly: This ...
MqttClient是MQTT客户端的抽象,它需要指定Broker地址,如"tcp://localhost:1883",同时需要指定一个唯一的客户端ID,在发布消息时,mqttClient.publish(topic, payload.getBytes(), qos, retained),需要指定主题topic,内容payload,以及质量Qos等。下面再给出订阅者代码: ...
In the following example, we show how to add a message listener to an existingIMqttClientinstance to receive messages from a given topic. We use aCountDownLatchas a synchronization mechanism between our callback and the main execution thread, decrementing it every time a new message arrives. ...
3.(方法一)MqttClient.java文件 importlombok.extern.slf4j.Slf4j;importorg.eclipse.paho.client.mqttv3.MqttConnectOptions;importorg.eclipse.paho.client.mqttv3.MqttDeliveryToken;importorg.eclipse.paho.client.mqttv3.MqttException;importorg.eclipse.paho.client.mqttv3.MqttMessage;importorg.eclipse.paho.client...
先创建MqttClinet对象。 privatevolatileMqttClient mqttClient;privatevolatileMqttMessage mqttMessage;privateMqttServerEntity mqttServerEntity;//初始化MQTTClient对象privatevoidinitClient() {try{ mqttClient=newMqttClient(getHostUrl(), getClientId()); ...
mica-mqtt基于t-io实现的简单、低延迟、高性能的 mqtt 物联网开源组件。 mica-mqtt server更加易于集成到已有服务和二次开发,降低自研物联网平台开发成本。 mica-mqtt client是简单、易用的 java mqtt 客户端,更加容易集成到自己的业务代码中。今天笔者主要要介绍的就是 mica-mqtt client 的使用。