SpringBoot2.0集成MQTT功能之消息订阅处理
原文链接： https://blog.csdn.net/qq_41018959/article/details/81076055
距离上一篇【SpringBoot2.0集成MQTT消息推送功能】https://blog.csdn.net/qq_41018959/article/details/80592444博客已经过去有一段时间了，最近比较忙，也没时间整理【SpringBoot2.0集成MQTT消息之消息订阅处理】篇章，刚好早上闲下来，就趁这个机会整理一下。
网上资料还是蛮多的，但也不是很全面，比如如何设置多个client，如何监听不同topic等，好了，废话不多说，还是跟上篇一样的环境，上代码：
第一，pom配置，引入相关jar:
-
<dependency>
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<groupId>org.springframework.integration
groupId>
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<artifactId>spring-integration-stream
artifactId>
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dependency>
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<dependency>
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<groupId>org.springframework.integration
groupId>
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<artifactId>spring-integration-mqtt
artifactId>
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dependency>
第二，配置MQTT服务器基本信息，在springBoot配置文件application.properties中配置，添加如下：
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#MQTT配置信息
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#MQTT-用户名
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spring.mqtt.username=admin
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#MQTT-密码
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spring.mqtt.password=password
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#MQTT-服务器连接地址，如果有多个，用逗号隔开，如：tcp://127.0.0.1:61613，tcp://192.168.2.133:61613
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spring.mqtt.url=tcp:
//127.0.0.1:61613
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#MQTT-连接服务器默认客户端ID
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spring.mqtt.client.id=mqttId
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#MQTT-默认的消息推送主题，实际可在调用接口时指定
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spring.mqtt.
default.topic=topic
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#连接超时
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spring.mqtt.completionTimeout=
3000
第三，配置MQTT消息接收处理类：
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/**
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* 〈一句话功能简述〉
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* 〈MQTT接收消息处理〉
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*
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* @author lenovo
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* @create 2018/6/4
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* @since 1.0.0
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*/
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@Configuration
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@IntegrationComponentScan
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public
class MqttReceiveConfig {
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@Value("${spring.mqtt.username}")
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private String username;
-
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@Value("${spring.mqtt.password}")
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private String password;
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@Value("${spring.mqtt.url}")
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private String hostUrl;
-
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@Value("${spring.mqtt.client.id}")
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private String clientId;
-
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@Value("${spring.mqtt.default.topic}")
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private String defaultTopic;
-
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@Value("${spring.mqtt.completionTimeout}")
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private int completionTimeout ;
//连接超时
-
-
-
@Bean
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public MqttConnectOptions getMqttConnectOptions(){
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MqttConnectOptions mqttConnectOptions=new MqttConnectOptions();
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mqttConnectOptions.setUserName(username);
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mqttConnectOptions.setPassword(password.toCharArray());
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mqttConnectOptions.setServerURIs(new String[]{hostUrl});
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mqttConnectOptions.setKeepAliveInterval(
2);
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return mqttConnectOptions;
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}
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@Bean
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public MqttPahoClientFactory mqttClientFactory() {
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DefaultMqttPahoClientFactory factory = new DefaultMqttPahoClientFactory();
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factory.setConnectionOptions(getMqttConnectOptions());
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return factory;
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}
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//接收通道
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@Bean
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public MessageChannel mqttInputChannel() {
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return new DirectChannel();
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}
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//配置client,监听的topic
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@Bean
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public MessageProducer inbound() {
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MqttPahoMessageDrivenChannelAdapter adapter =
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new MqttPahoMessageDrivenChannelAdapter(clientId+
"_inbound", mqttClientFactory(),
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"hello",
"hello1");
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adapter.setCompletionTimeout(completionTimeout);
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adapter.setConverter(new DefaultPahoMessageConverter());
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adapter.setQos(
1);
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adapter.setOutputChannel(mqttInputChannel());
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return adapter;
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}
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//通过通道获取数据
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@Bean
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@ServiceActivator(inputChannel = "mqttInputChannel")
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public MessageHandler handler() {
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return new MessageHandler() {
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@Override
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public void handleMessage(Message message) throws MessagingException {
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String topic = message.getHeaders().
get(
"mqtt_receivedTopic").toString();
-
String type = topic.substring(topic.lastIndexOf(
"/")+
1, topic.length());
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if(
"hello".equalsIgnoreCase(topic)){
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System.
out.println(
"hello,fuckXX,"+message.getPayload().toString());
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}
else
if(
"hello1".equalsIgnoreCase(topic)){
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System.
out.println(
"hello1,fuckXX,"+message.getPayload().toString());
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}
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}
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};
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}
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}
第四，启动服务测试，使用postment调用上一篇的MQTT发送接口，分别往hello,hello1两个topic发送消息，测试接收情况：
由此看出，可以正常监听topic并接收处理消息了。
看到这里，朋友们可能有疑问，如果我要配置多个client，应该怎么处理呢？这个也简单，我们只要配置多个通道即可，简单代码如下：
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//通道2
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@Bean
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public MessageChannel mqttInputChannelTwo() {
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return
new DirectChannel();
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}
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//配置client2，监听的topic:hell2,hello3
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@Bean
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public MessageProducer inbound1() {
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MqttPahoMessageDrivenChannelAdapter adapter =
-
new MqttPahoMessageDrivenChannelAdapter(clientId+
"_inboundTwo", mqttClientFactory(),
-
"hello2",
"hello3");
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adapter.setCompletionTimeout(completionTimeout);
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adapter.setConverter(
new DefaultPahoMessageConverter());
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adapter.setQos(
1);
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adapter.setOutputChannel(mqttInputChannelTwo());
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return adapter;
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}
-
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//通过通道2获取数据
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@Bean
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@ServiceActivator(inputChannel =
"mqttInputChannelTwo")
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public MessageHandler handlerTwo() {
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return
new MessageHandler() {
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@Override
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public void handleMessage(Message message) throws MessagingException {
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String topic = message.getHeaders().get(
"mqtt_receivedTopic").toString();
-
String type = topic.substring(topic.lastIndexOf(
"/")+
1, topic.length());
-
if(
"hello2".equalsIgnoreCase(topic)){
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System.out.println(
"hello2 clientTwo,"+message.getPayload().toString());
-
}
else
if(
"hello3".equalsIgnoreCase(topic)){
-
System.out.println(
"hello3 clientTwo,"+message.getPayload().toString());
-
}
-
}
-
};
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}
这样一来，我们就配置了两个client，client1监听处理hello、hello1主题消息，client2监听处理hello2、hello3主题，测试一下：
从输出结果可以看出，我们发送不同的消息，分别由不同的client处理。所以，小伙伴，你理解了吗？
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