SpringBoot整合MQTT快速入门依赖配置mqtt 创建回调类 SampleCallback 测试相关文章

快速入门

依赖

<dependency>
    <groupId>org.eclipse.paho</groupId>
    <artifactId>org.eclipse.paho.client.mqttv3</artifactId>
    <version>1.2.5</version>
</dependency>

配置mqtt

@Configuration
public class MqttConfig {

    @Bean
    public MqttClient init() throws MqttException {
        String broker = "tcp://broker.emqx.io:1883";
        String clientId = MqttClient.generateClientId();
        MemoryPersistence persistence = new MemoryPersistence();
        MqttConnectOptions connOpts = new MqttConnectOptions();
        connOpts.setUserName("emqx_user");
        connOpts.setPassword("emqx_password".toCharArray());
        connOpts.setKeepAliveInterval(10);
        connOpts.setAutomaticReconnect(true);

        // 建立连接
        MqttClient client = new MqttClient(broker, clientId, persistence);
        client.setCallback(new SampleCallback());
        client.connect(connOpts);
        System.out.println("成功连接到服务器：" + broker);

        // 订阅
        String topic = "test/topic";
        client.subscribe(topic,2);
        System.out.println("订阅了主题：" + topic);

        return client;
    }

}

创建回调类 SampleCallback

public class SampleCallback implements MqttCallback {

    // 连接丢失
    public void connectionLost(Throwable cause) {
        System.out.println("连接丢失：connection lost：" + cause.getMessage() + "，连接丢失时间：" + DateUtil.format(new Date(), "yyyy-MM-dd HH:mm:ss"));
    }

    //  收到消息
    public void messageArrived(String topic, MqttMessage message) {
        System.out.println("收到消息：\n  topic：" + topic + "\n  Qos：" + message.getQos() + "\n  payload：" + new String(message.getPayload()));
    }

    // 消息传递成功
    public void deliveryComplete(IMqttDeliveryToken token) {
        System.out.println("消息投递成功");
    }
}

测试

@RestController
public class MyController {

    @Autowired
    private MqttClient client;

    @RequestMapping("testMqtt")
    public String test() throws MqttException {
        String topic = "test/topic";
        String content = "你好呀，我们都在用免费的mqtt服务器";

        MqttMessage message = new MqttMessage(content.getBytes());
        message.setQos(2);
        client.publish(topic, message);
        return "success";
    }

}