springboot配置MQTT 接收字节码

1、配置JAR包

		
			org.springframework.integration
			spring-integration-stream
		

		
		
			org.springframework.integration
			spring-integration-mqtt
		
		
			org.eclipse.paho
			org.eclipse.paho.client.mqttv3
		

2、在yml配置中增加MQTT的相关配置信息

3、设置mqtt配置类

@Configuration
@IntegrationComponentScan
@EnableConfigurationProperties({MqttProperties.class})
public class MqttConfig {

    private static final String RANDOM_ID = CommonConstant.Symbol.UNDERSCORE + RandomUtil.randomString(8);

    @Resource
    private MqttProperties mqttProperties;

    @Bean
    public MessageChannel mqttInputChannel() {
        return new DirectChannel();
    }

    @Bean
    public MessageChannel mqttOutputChannel() {
        return new DirectChannel();
    }

    @Bean
    public MessageProducer mqttInbound() {
        // set default receive topic
        String topicName = "dc3/mc/" + mqttProperties.getClient();
        if (null == mqttProperties.getReceiveTopics()) {
            mqttProperties.setReceiveTopics(new ArrayList<>());
        }
        boolean match = mqttProperties.getReceiveTopics().stream().anyMatch(topic -> topic.getName().equals(topicName));
        if (!match) {
            mqttProperties.getReceiveTopics().add(new MqttProperties.Topic(topicName, 2));
        }

        MqttPahoMessageDrivenChannelAdapter adapter = new MqttPahoMessageDrivenChannelAdapter(
                mqttProperties.getClient() + RANDOM_ID + "_in",
                mqttClientFactory(),
                mqttProperties.getReceiveTopics().stream().map(MqttProperties.Topic::getName).toArray(String[]::new));
        adapter.setQos(mqttProperties.getReceiveTopics().stream().mapToInt(MqttProperties.Topic::getQos).toArray());
        adapter.setOutputChannel(mqttInputChannel());
        DefaultPahoMessageConverter convert = new DefaultPahoMessageConverter();
        convert.setPayloadAsBytes(true);
        adapter.setConverter(convert);
        adapter.setCompletionTimeout(mqttProperties.getCompletionTimeout());
        return adapter;
    }

    @Bean
    @ServiceActivator(inputChannel = "mqttOutputChannel")
    public MessageHandler outbound() {
        MqttPahoMessageHandler messageHandler = new MqttPahoMessageHandler(
                mqttProperties.getClient() + "_out",
                mqttClientFactory());
        messageHandler.setAsync(true);
        messageHandler.setDefaultQos(mqttProperties.getDefaultSendTopic().getQos());
        messageHandler.setDefaultTopic(mqttProperties.getDefaultSendTopic().getName());
        return messageHandler;
    }

    @Bean
    public MqttPahoClientFactory mqttClientFactory() {
        DefaultMqttPahoClientFactory factory = new DefaultMqttPahoClientFactory();
        factory.setConnectionOptions(getMqttConnectOptions());
        return factory;
    }

    @Bean
    public MqttConnectOptions getMqttConnectOptions() {
        MqttConnectOptions mqttConnectOptions = new MqttConnectOptions();

        // username & password
        if (mqttProperties.getAuthType().equals(MqttProperties.AuthTypeEnum.USERNAME)) {
            mqttConnectOptions.setUserName(mqttProperties.getUsername());
            mqttConnectOptions.setPassword(mqttProperties.getPassword().toCharArray());
        }

        // tls x509
        if (mqttProperties.getAuthType().equals(MqttProperties.AuthTypeEnum.X509)) {
            mqttConnectOptions.setSocketFactory(X509Util.getSSLSocketFactory(
                    mqttProperties.getCaCrt(),
                    mqttProperties.getClientCrt(),
                    mqttProperties.getClientKey(),
                    StrUtil.isBlank(mqttProperties.getClientKeyPass()) ? "" : mqttProperties.getClientKeyPass()
            ));
            if (!StrUtil.isBlank(mqttProperties.getUsername()) && !StrUtil.isBlank(mqttProperties.getPassword())) {
                mqttConnectOptions.setUserName(mqttProperties.getUsername());
                mqttConnectOptions.setPassword(mqttProperties.getPassword().toCharArray());
            }
        }

        // disable https hostname verification
        mqttConnectOptions.setHttpsHostnameVerificationEnabled(false);
        mqttConnectOptions.setServerURIs(new String[]{mqttProperties.getUrl()});
        mqttConnectOptions.setKeepAliveInterval(mqttProperties.getKeepAlive());
        return mqttConnectOptions;

    }

}

在这个代码中       

DefaultPahoMessageConverter convert = new DefaultPahoMessageConverter();
 convert.setPayloadAsBytes(true);

这两个行用于配置接收MQTT的字节码信息。如果不进行这个配置，当MQTT发送字节码时，会自动转换为字符串。

4、设置接收MQTT消息类方法

    @Bean
    @ServiceActivator(inputChannel = "mqttInputChannel")
    public MessageHandler handlerValue() {
    	return new MessageHandler() {
			@Override
			public void handleMessage(Message message) throws MessagingException {
				byte[] by = (byte[])message.getPayload();
				System.out.println(by.length);
			}
		};
    }