Java springboot中的Mqtt集成

我尝试在Spring Boot Java项目中集成mqtt

我的部门：

<dependency>
        <groupId>org.springframework.integration</groupId>
        <artifactId>spring-integration-mqtt</artifactId>
        <scope>compile</scope>
        <exclusions>
            <exclusion>
                <artifactId>jackson-module-kotlin</artifactId>
                <groupId>com.fasterxml.jackson.module</groupId>
            </exclusion>
        </exclusions>
    </dependency>

我在这里得到一个错误：org.eclipse.paho.client.mqttv3.MqttClient

错误：未处理的异常：org.eclipse.paho.client.mqttv3.MqttException

---

知道怎么了吗？

不知道是什么问题吗？我确实用下面的方式解决了同样的问题。看看它是否适合你。我有一个定义如下的mqtt网关类

import org.springframework.integration.annotation.MessagingGateway;

@MessagingGateway(defaultRequestChannel = "mqttPromiseOutboundChannel")
public interface MqttPromiseGateway {

    void sendToMqtt(String data);
}

当我想向Mqtt发送消息时，我会自动连接定义的网关类

@Autowired
private MqttPromiseGateway mqttPromiseGateway;

现在，我可以使用该网关通过Mqtt通道发送消息

 mqttPromiseGateway.sendToMqtt(content);

我们还为MqttProducer定义了一个服务

@Service
public class DemoMqttProducer {

    @Bean
    public MqttPahoClientFactory mqttClientFactory() {
        DefaultMqttPahoClientFactory factory = new DefaultMqttPahoClientFactory();
        MqttConnectOptions options = new MqttConnectOptions();
        options.setServerURIs(new String[] { "tcp://localhost:1883" });
        options.setUserName("myusername");
        options.setPassword("mypassword#".toCharArray());
        factory.setConnectionOptions(options);
        return factory;
    }


    @Bean
    @ServiceActivator(inputChannel = "mqttPromiseOutboundChannel")
    public MessageHandler mqttPromiseOutbound() {
        MqttPahoMessageHandler messageHandler =
                new MqttPahoMessageHandler("testClient", mqttClientFactory());
        messageHandler.setAsync(true);
        messageHandler.setDefaultTopic("Promise");
        return messageHandler;
    }

    @Bean
    public MessageChannel mqttOutboundChannel() {
        return new DirectChannel();
    }
    @Bean
    public MessageChannel mqttPromiseOutboundChannel() {
        return new DirectChannel();
    }
    @Bean
    public IntegrationFlow mqttInFlow() {
        return IntegrationFlows.from(mqttInbound())
                .transform(p -> p + ", received from MQTT")
                .handle(logger())
                .get();
    }

    @Bean
    public MessageProducerSupport mqttInbound() {
        MqttPahoMessageDrivenChannelAdapter adapter = new MqttPahoMessageDrivenChannelAdapter("siSampleConsumer",
                mqttClientFactory(), "Promise");
        adapter.setCompletionTimeout(5000);
        adapter.setConverter(new DefaultPahoMessageConverter());
        adapter.setQos(1);
        return adapter;
    }    

}

---

方法mqttInflow将获取传入消息并将其发送到记录器。如果您想以不同的方式处理，您需要更改该方法。

无法找出问题所在？我确实用下面的方式解决了同样的问题。看看它是否适合你。我有一个定义如下的mqtt网关类

import org.springframework.integration.annotation.MessagingGateway;

@MessagingGateway(defaultRequestChannel = "mqttPromiseOutboundChannel")
public interface MqttPromiseGateway {

    void sendToMqtt(String data);
}

当我想向Mqtt发送消息时，我会自动连接定义的网关类

@Autowired
private MqttPromiseGateway mqttPromiseGateway;

现在，我可以使用该网关通过Mqtt通道发送消息

 mqttPromiseGateway.sendToMqtt(content);

我们还为MqttProducer定义了一个服务

@Service
public class DemoMqttProducer {

    @Bean
    public MqttPahoClientFactory mqttClientFactory() {
        DefaultMqttPahoClientFactory factory = new DefaultMqttPahoClientFactory();
        MqttConnectOptions options = new MqttConnectOptions();
        options.setServerURIs(new String[] { "tcp://localhost:1883" });
        options.setUserName("myusername");
        options.setPassword("mypassword#".toCharArray());
        factory.setConnectionOptions(options);
        return factory;
    }


    @Bean
    @ServiceActivator(inputChannel = "mqttPromiseOutboundChannel")
    public MessageHandler mqttPromiseOutbound() {
        MqttPahoMessageHandler messageHandler =
                new MqttPahoMessageHandler("testClient", mqttClientFactory());
        messageHandler.setAsync(true);
        messageHandler.setDefaultTopic("Promise");
        return messageHandler;
    }

    @Bean
    public MessageChannel mqttOutboundChannel() {
        return new DirectChannel();
    }
    @Bean
    public MessageChannel mqttPromiseOutboundChannel() {
        return new DirectChannel();
    }
    @Bean
    public IntegrationFlow mqttInFlow() {
        return IntegrationFlows.from(mqttInbound())
                .transform(p -> p + ", received from MQTT")
                .handle(logger())
                .get();
    }

    @Bean
    public MessageProducerSupport mqttInbound() {
        MqttPahoMessageDrivenChannelAdapter adapter = new MqttPahoMessageDrivenChannelAdapter("siSampleConsumer",
                mqttClientFactory(), "Promise");
        adapter.setCompletionTimeout(5000);
        adapter.setConverter(new DefaultPahoMessageConverter());
        adapter.setQos(1);
        return adapter;
    }    

}

---

方法mqttInflow将获取传入消息并将其发送到记录器。如果要以不同的方式处理，则需要更改该方法。

是否可以发布完整的错误消息？因为这可能暗示了什么地方出了问题。参考：你能发布完整的错误消息吗？因为这可能暗示出问题所在。请参考：