SpringBoot版本：1.4.4.RELEASE
ActiveMq版本：5.15.4
后台代码：
pom文件除常规配置外加入：
<dependency> <groupId>org.springframework.integration</groupId> <artifactId>spring-integration-mqtt</artifactId> </dependency>
加入配置类：
import java.util.Random; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.integration.annotation.ServiceActivator; import org.springframework.integration.channel.DirectChannel; import org.springframework.integration.endpoint.MessageProducerSupport; import org.springframework.integration.mqtt.core.DefaultMqttPahoClientFactory; import org.springframework.integration.mqtt.core.MqttPahoClientFactory; import org.springframework.integration.mqtt.inbound.MqttPahoMessageDrivenChannelAdapter; import org.springframework.integration.mqtt.outbound.MqttPahoMessageHandler; import org.springframework.integration.mqtt.support.DefaultPahoMessageConverter; import org.springframework.messaging.MessageChannel; import org.springframework.messaging.MessageHandler; @Configuration public class MqttConfiguration { private Random rand = new Random(); private String clientId = ""; // ==================== 连接activemq ==================== @Bean public MqttPahoClientFactory clientFactory() { DefaultMqttPahoClientFactory clientFactory = new DefaultMqttPahoClientFactory(); clientFactory.setServerURIs("tcp://localhost:1883"); clientFactory.setUserName("system"); clientFactory.setPassword("manager"); return clientFactory; } // ==================== 生产者 ==================== @Bean public MessageChannel mqttOutboundChannel() { return new DirectChannel(); } @Bean @ServiceActivator(inputChannel = "mqttOutboundChannel") // 绑定生产者 public MqttPahoMessageHandler mqttOutbound(MqttPahoClientFactory clientFactory) { MqttPahoMessageHandler messageHandler = new MqttPahoMessageHandler( clientId + String.format("%05d", rand.nextInt(10000)), clientFactory); messageHandler.setAsync(true); messageHandler.setDefaultQos(1); messageHandler.setDefaultRetained(false); messageHandler.setAsyncEvents(false); return messageHandler; } // ==================== 消费者 ==================== @Bean public MessageChannel mqttInputChannel() { return new DirectChannel(); } @Bean @ServiceActivator(inputChannel = "mqttInputChannel") // 绑定消费者 public MessageHandler handler() { return new ReceiveMessageHandler(); } @Bean public MessageProducerSupport mqttInbound() { MqttPahoMessageDrivenChannelAdapter adapter = new MqttPahoMessageDrivenChannelAdapter( clientId + String.format("%05d", rand.nextInt(10000)), clientFactory(), "mqtt-topic-demo"); adapter.setConverter(new DefaultPahoMessageConverter()); adapter.setQos(1); adapter.setOutputChannel(mqttInputChannel()); return adapter; } }后台消费者：
import org.slf4j.LoggerFactory; import org.springframework.messaging.Message; import org.springframework.messaging.MessageHandler; import org.springframework.messaging.MessagingException; import ch.qos.logback.classic.Logger; public class ReceiveMessageHandler implements MessageHandler { protected static Logger logger = (Logger) LoggerFactory.getLogger(ReceiveMessageHandler.class); @Override public void handleMessage(Message<?> message) throws MessagingException { String str = (String) message.getPayload(); System.out.println("接收到消息：" + str); } }消息发送接口：
import org.springframework.integration.annotation.MessagingGateway; import org.springframework.messaging.Message; /** * 消息发送接口，不需要实现，spring会通过代理的方式实现 */ @MessagingGateway(defaultRequestChannel = "mqttOutboundChannel") public interface MqttMessageGateway { void sendMessage(Message<?> message); }发送消息业务类：
@Autowired private MqttMessageGateway gateway;
Message<String> message = MessageBuilder.withPayload("修改笔记，新的笔记名称：" + oldSysNote.getNoteName()) .setHeader(MqttHeaders.TOPIC, "mqtt-topic-demo").build(); gateway.sendMessage(message);前端代码：
引入js：
mqttws31.min.js
编写连接代码：client = new Paho.MQTT.Client("localhost", 61614, "" ,"web" + RndNum(12)); //建立客户端实例 client.connect({ onSuccess: onConnect, userName: "system", password: "manager" }); //连接服务器并注册连接成功处理事件 client.onConnectionLost = onConnectionLost; //注册连接断开处理事件 client.onMessageArrived = onMessageArrived; //注册消息接收处理事件 function onConnect() { client.subscribe("mqtt-topic-demo"); //订阅主题 } function onConnectionLost(responseObject) { if(responseObject.errorCode !== 0) { console.log("连接已断开"); } } function onMessageArrived(message) { var ss = message.destinationName; var meg = message.payloadString; alert("您有新消息：" + meg); }启动ActiveMq服务器：
这里使用windows版本：
启动服务后访问控制台，可以看到主题
效果：
当修改笔记时，推送消息
