Spring集成MQTT推送消息

(mqtt java客户端的使用参看这篇文章)

Spring Integration基于Eclipse Paho MQTT客户端库提供了支持MQTT协议的入站和出站通道适配器。但是使用起来不是很灵活(有可能是没有深入理解)。在参考了这篇文章后有了如下实现：

1. maven依赖

    <dependency>
        <groupId>org.springframework.integration</groupId>
        <artifactId>spring-integration-core</artifactId>
        <version>4.3.9.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.springframework.integration</groupId>
        <artifactId>spring-integration-mqtt</artifactId>
        <version>4.3.9.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.eclipse.paho</groupId>
        <artifactId>org.eclipse.paho.client.mqttv3</artifactId>
        <version>1.2.0</version>
    </dependency>

2. 配置文件

• applicationContext.xml

    <bean id="clientFactory"  
        class="org.springframework.integration.mqtt.core.DefaultMqttPahoClientFactory">  
        <property name="userName" value="${mqtt.username}"/>  
        <property name="password" value="${mqtt.password}"/>
        <property name="cleanSession" value="${mqtt.cleanSession}"/>
        <property name="keepAliveInterval" value="${mqtt.keepAliveInterval}"/>
        <property name="serverURIs">
            <array>
                <value>${mqtt.serverURI1}</value>
            </array>
        </property>
    </bean>

    <bean id="mqttHandler" class="org.springframework.integration.mqtt.outbound.MqttPahoMessageHandler">  
        <constructor-arg name="clientId" value="${mqtt.clientId}"/>
        <constructor-arg name="clientFactory" ref="clientFactory"/>
        <property name="async" value="${mqtt.async}"/>
        <property name="defaultQos" value="${mqtt.defaultQos}"/>
        <property name="completionTimeout" value="${mqtt.completionTimeout}"/>
    </bean>

• config.properties

#用户名
mqtt.username=mqttPubClient
#密码
mqtt.password=123456
#是否清除会话
mqtt.cleanSession=false
#服务端url
mqtt.serverURI1=tcp://localhost:1883
#是否异步发送
mqtt.async=true
#超时时间
mqtt.completionTimeout=20000
#心跳
mqtt.keepAliveInterval=30
#客户端id
mqtt.clientId=mqttPubClient
#默认的消息服务质量
mqtt.defaultQos=1

3. 调用

    @Resource  
    private MqttPahoMessageHandler mqttHandler;  
    
    @Override
    public void send(String topic, String content) {
        // 构建消息
        Message<String> messages = MessageBuilder.withPayload(content).setHeader(MqttHeaders.TOPIC, topic).build();  
        // 发送消息
        mqttHandler.handleMessage(messages);
    }

示例代码：https://github.com/brandonbai/spring-mqtt-demo

链接

• 项目网站：https://www.eclipse.org/paho
• Eclipse项目信息：https://projects.eclipse.org/projects/iot.paho
• GitHub：https://github.com/eclipse/paho.mqtt.java
• MQTT Java客户端的使用：https://www.jianshu.com/p/65e1748a930c
• MQTT服务端Mosquitto搭建：https://www.jianshu.com/p/9e3cb7042a2e