我要评论在spring boot中对接mqtt协议，可以使用eclipse paho客户端和spring integration mqtt模块。以下是详细实现步骤：
1. 添加依赖
<dependencies>
<!-- spring boot starter -->
<dependency>
<groupid>org.springframework.boot</groupid>
<artifactid>spring-boot-starter</artifactid>
</dependency>
<!-- spring integration mqtt -->
<dependency>
<groupid>org.springframework.integration</groupid>
<artifactid>spring-integration-mqtt</artifactid>
</dependency>
<!-- eclipse paho mqtt client -->
<dependency>
<groupid>org.eclipse.paho</groupid>
<artifactid>org.eclipse.paho.client.mqttv3</artifactid>
<version>1.2.5</version>
</dependency>
</dependencies>
2. 配置mqtt连接参数
# application.yml mqtt: broker-url: tcp://localhost:1883 username: admin password: password client-id: spring-boot-client default-topic: test/topic timeout: 30 keepalive: 60 completion-timeout: 30000
3. mqtt配置类
@configuration
@enableconfigurationproperties(mqttproperties.class)
public class mqttconfig {
@autowired
private mqttproperties mqttproperties;
// mqtt连接配置
@bean
public mqttconnectoptions mqttconnectoptions() {
mqttconnectoptions options = new mqttconnectoptions();
options.setserveruris(new string[]{mqttproperties.getbrokerurl()});
options.setusername(mqttproperties.getusername());
options.setpassword(mqttproperties.getpassword().tochararray());
options.setconnectiontimeout(mqttproperties.gettimeout());
options.setkeepaliveinterval(mqttproperties.getkeepalive());
options.setautomaticreconnect(true);
options.setcleansession(true);
return options;
}
// mqtt客户端工厂
@bean
public mqttpahoclientfactory mqttclientfactory() {
defaultmqttpahoclientfactory factory = new defaultmqttpahoclientfactory();
factory.setconnectionoptions(mqttconnectoptions());
return factory;
}
// 出站消息通道（用于发送消息）
@bean
@serviceactivator(inputchannel = "mqttoutboundchannel")
public messagehandler mqttoutbound() {
mqttpahomessagehandler messagehandler =
new mqttpahomessagehandler(mqttproperties.getclientid() + "-producer", mqttclientfactory());
messagehandler.setasync(true);
messagehandler.setdefaulttopic(mqttproperties.getdefaulttopic());
return messagehandler;
}
// 出站通道
@bean
public messagechannel mqttoutboundchannel() {
return new directchannel();
}
// 入站消息适配器（用于接收消息）
@bean
public messageproducer inbound() {
mqttpahomessagedrivenchanneladapter adapter =
new mqttpahomessagedrivenchanneladapter(mqttproperties.getclientid() + "-consumer",
mqttclientfactory(), mqttproperties.getdefaulttopic());
adapter.setcompletiontimeout(mqttproperties.getcompletiontimeout());
adapter.setconverter(new defaultpahomessageconverter());
adapter.setqos(1);
adapter.setoutputchannel(mqttinboundchannel());
return adapter;
}
// 入站通道
@bean
public messagechannel mqttinboundchannel() {
return new directchannel();
}
// 入站消息处理器
@bean
@serviceactivator(inputchannel = "mqttinboundchannel")
public messagehandler handler() {
return new messagehandler() {
@override
public void handlemessage(message<?> message) throws messagingexception {
string topic = (string) message.getheaders().get("mqtt_receivedtopic");
string payload = (string) message.getpayload();
system.out.println("received message from topic: " + topic + ", payload: " + payload);
// 处理接收到的消息
processmessage(topic, payload);
}
};
}
}
4. 配置属性类
@configurationproperties(prefix = "mqtt")
@component
@data
public class mqttproperties {
private string brokerurl;
private string username;
private string password;
private string clientid;
private string defaulttopic;
private int timeout;
private int keepalive;
private int completiontimeout;
}
5. mqtt服务类
@service
public class mqttservice {
@autowired
private messagechannel mqttoutboundchannel;
// 发送消息到指定主题
public void sendmessage(string topic, string message) {
mqttoutboundchannel.send(messagebuilder.withpayload(message)
.setheader("mqtt_topic", topic)
.build());
}
// 发送消息到默认主题
public void sendmessage(string message) {
mqttoutboundchannel.send(messagebuilder.withpayload(message).build());
}
// 发送带qos的消息
public void sendmessage(string topic, string message, int qos) {
mqttoutboundchannel.send(messagebuilder.withpayload(message)
.setheader("mqtt_topic", topic)
.setheader("mqtt_qos", qos)
.build());
}
}
6. 消息处理器
@component
public class mqttmessageprocessor {
private static final logger logger = loggerfactory.getlogger(mqttmessageprocessor.class);
public void processmessage(string topic, string payload) {
logger.info("processing mqtt message - topic: {}, payload: {}", topic, payload);
// 根据不同的主题进行不同的处理
switch (topic) {
case "test/topic":
handletesttopic(payload);
break;
case "sensor/data":
handlesensordata(payload);
break;
default:
handledefaultmessage(topic, payload);
}
}
private void handletesttopic(string payload) {
logger.info("处理测试主题消息: {}", payload);
// 具体的业务逻辑
}
private void handlesensordata(string payload) {
logger.info("处理传感器数据: {}", payload);
try {
// 解析json数据等操作
// objectmapper mapper = new objectmapper();
// sensordata data = mapper.readvalue(payload, sensordata.class);
} catch (exception e) {
logger.error("解析传感器数据失败", e);
}
}
private void handledefaultmessage(string topic, string payload) {
logger.info("处理默认消息 - topic: {}, payload: {}", topic, payload);
}
}
7. 控制器示例
@restcontroller
@requestmapping("/mqtt")
public class mqttcontroller {
@autowired
private mqttservice mqttservice;
@postmapping("/publish")
public responseentity<string> publishmessage(@requestparam string topic,
@requestparam string message) {
try {
mqttservice.sendmessage(topic, message);
return responseentity.ok("message published successfully");
} catch (exception e) {
return responseentity.status(500).body("failed to publish message: " + e.getmessage());
}
}
@postmapping("/publish/default")
public responseentity<string> publishtodefaulttopic(@requestparam string message) {
try {
mqttservice.sendmessage(message);
return responseentity.ok("message published to default topic");
} catch (exception e) {
return responseentity.status(500).body("failed to publish message: " + e.getmessage());
}
}
}
8. 主应用类
@springbootapplication
@enableconfigurationproperties
public class mqttapplication {
public static void main(string[] args) {
springapplication.run(mqttapplication.class, args);
}
}
9. 测试mqtt服务
可以使用mqtt.fx或其他mqtt客户端工具进行测试：
- 启动spring boot应用
- 使用mqtt客户端订阅主题
test/topic - 调用api发送消息：
curl -x post "http://localhost:8080/mqtt/publish?topic=test/topic&message=hello mqtt"
主要特性
- 自动重连: 配置了自动重连机制
- qos支持: 支持不同的服务质量等级
- 多主题订阅: 可以订阅多个主题
- 异步处理: 消息发送支持异步模式
- 配置灵活: 通过配置文件管理连接参数
这样你就实现了一个完整的spring boot mqtt集成方案，可以方便地进行消息的发布和订阅。
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