關於一些介紹接不多少了,都可以百度的到
第一:EMQ服務的安裝
集成mqtt少不了服務器,雖然有很多種的mqtt的服務器,這裏我選擇的是EMQ服務器
Windows下emq安裝:https://blog.csdn.net/qq_40821260/article/details/106020962
第二:成果圖
第三:代碼實現
1,pom文件
<dependencies>
<!-- https://mvnrepository.com/artifact/com.alibaba/fastjson -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.68</version>
</dependency>
<!--mqtt依賴-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-integration</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.integration</groupId>
<artifactId>spring-integration-stream</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.integration</groupId>
<artifactId>spring-integration-mqtt</artifactId>
</dependency>
<!--lombok-->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
2,yml文件
server:
port: 8023
spring:
#給項目來個名字
application:
name: mqtt
#MQTT-用戶名
mqtt:
username: admin
#MQTT-密碼password: password
password: public
#MQTT-服務器連接地址,如果有多個,用逗號隔開,如:tcp://127.0.0.1:1883,tcp://192.168.2.133:1883
url: tcp://127.0.0.1:1883
#MQTT-連接服務器默認客戶端ID
client:
id: mqttId
#MQTT-默認的消息推送主題,實際可在調用接口時指定
default:
topic: topic
yihonWQM: YIHON_WQ_M
#連接超時
completionTimeout: 3000
3,MqttSenderAndReceiveConfig推送接受消息類
package com.zxk.mqtt.configuration;
import com.alibaba.fastjson.JSONObject;
import com.zxk.mqtt.handle.MqttReceiveHandle;
import lombok.extern.slf4j.Slf4j;
import org.eclipse.paho.client.mqttv3.MqttConnectOptions;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.integration.annotation.IntegrationComponentScan;
import org.springframework.integration.annotation.ServiceActivator;
import org.springframework.integration.channel.DirectChannel;
import org.springframework.integration.core.MessageProducer;
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.Message;
import org.springframework.messaging.MessageChannel;
import org.springframework.messaging.MessageHandler;
import org.springframework.messaging.MessagingException;
/**
* mqtt 推送and接收 消息類
* **/
@Configuration
@IntegrationComponentScan
@Slf4j
public class MqttSenderAndReceiveConfig {
private static final byte[] WILL_DATA;
static {
WILL_DATA = "offline".getBytes();
}
@Autowired
private MqttReceiveHandle mqttReceiveHandle;
@Value("${spring.mqtt.username}")
private String username;
@Value("${spring.mqtt.password}")
private String password;
@Value("${spring.mqtt.url}")
private String hostUrl;
@Value("${spring.mqtt.client.id}")
private String clientId;
@Value("${spring.mqtt.default.topic}")
private String defaultTopic;
//水質設備主題
@Value("${spring.mqtt.default.yihonWQM}")
private String yihonWQM;
@Value("${spring.mqtt.completionTimeout}")
private int completionTimeout; //連接超時
/**
* MQTT連接器選項
* **/
@Bean(value = "getMqttConnectOptions")
public MqttConnectOptions getMqttConnectOptions1(){
MqttConnectOptions mqttConnectOptions=new MqttConnectOptions();
// 設置是否清空session,這裏如果設置爲false表示服務器會保留客戶端的連接記錄,這裏設置爲true表示每次連接到服務器都以新的身份連接
mqttConnectOptions.setCleanSession(true);
// 設置超時時間 單位爲秒
mqttConnectOptions.setConnectionTimeout(10);
mqttConnectOptions.setAutomaticReconnect(true);
mqttConnectOptions.setUserName(username);
mqttConnectOptions.setPassword(password.toCharArray());
mqttConnectOptions.setServerURIs(new String[]{hostUrl});
// 設置會話心跳時間 單位爲秒 服務器會每隔1.5*20秒的時間向客戶端發送心跳判斷客戶端是否在線,但這個方法並沒有重連的機制
mqttConnectOptions.setKeepAliveInterval(10);
// 設置“遺囑”消息的話題,若客戶端與服務器之間的連接意外中斷,服務器將發佈客戶端的“遺囑”消息。
//mqttConnectOptions.setWill("willTopic", WILL_DATA, 2, false);
return mqttConnectOptions;
}
/**
* MQTT工廠
* **/
@Bean
public MqttPahoClientFactory mqttClientFactory() {
DefaultMqttPahoClientFactory factory = new DefaultMqttPahoClientFactory();
factory.setConnectionOptions(getMqttConnectOptions1());
return factory;
}
/**
* MQTT信息通道(生產者)
* **/
@Bean
public MessageChannel mqttOutboundChannel() {
return new DirectChannel();
}
/**
* MQTT消息處理器(生產者)
* **/
@Bean
@ServiceActivator(inputChannel = "mqttOutboundChannel")
public MessageHandler mqttOutbound() {
MqttPahoMessageHandler messageHandler = new MqttPahoMessageHandler(clientId, mqttClientFactory());
messageHandler.setAsync(true);
messageHandler.setDefaultTopic(defaultTopic);
return messageHandler;
}
/**
* 配置client,監聽的topic
* MQTT消息訂閱綁定(消費者)
* **/
@Bean
public MessageProducer inbound() {
MqttPahoMessageDrivenChannelAdapter adapter =
new MqttPahoMessageDrivenChannelAdapter(clientId + "_inbound1", mqttClientFactory(),
defaultTopic,yihonWQM);
adapter.setCompletionTimeout(completionTimeout);
adapter.setConverter(new DefaultPahoMessageConverter());
adapter.setQos(2);
adapter.setOutputChannel(mqttInputChannel());
return adapter;
}
/**
* MQTT信息通道(消費者)
* **/
@Bean
public MessageChannel mqttInputChannel() {
return new DirectChannel();
}
/**
* MQTT消息處理器(消費者)
* **/
@Bean
@ServiceActivator(inputChannel = "mqttInputChannel")
public MessageHandler handler() {
return new MessageHandler() {
@Override
public void handleMessage(Message<?> message) throws MessagingException {
//處理接收消息
mqttReceiveHandle.handle(message);
}
};
}
}
4,MqttGateway發送消息類
package com.zxk.mqtt.configuration;
import org.springframework.integration.annotation.MessagingGateway;
import org.springframework.integration.mqtt.support.MqttHeaders;
import org.springframework.messaging.handler.annotation.Header;
/**
* mqtt發送消息
* (defaultRequestChannel = "mqttOutboundChannel" 對應config配置)
* **/
@MessagingGateway(defaultRequestChannel = "mqttOutboundChannel")
public interface MqttGateway {
/**
* 發送信息到MQTT服務器
*
* @param data 發送的文本
*/
void sendToMqtt(String data);
/**
* 發送信息到MQTT服務器
*
* @param topic 主題
* @param payload 消息主體
*/
void sendToMqtt(@Header(MqttHeaders.TOPIC) String topic,
String payload);
/**
* 發送信息到MQTT服務器
*
* @param topic 主題
* @param qos 對消息處理的幾種機制。
* 0 表示的是訂閱者沒收到消息不會再次發送,消息會丟失。
* 1 表示的是會嘗試重試,一直到接收到消息,但這種情況可能導致訂閱者收到多次重複消息。
* 2 多了一次去重的動作,確保訂閱者收到的消息有一次。
* @param payload 消息主體
*/
void sendToMqtt(@Header(MqttHeaders.TOPIC) String topic,
@Header(MqttHeaders.QOS) int qos,
String payload);
}
5,Controller控制
package com.zxk.mqtt.controller;
import com.zxk.mqtt.configuration.MqttGateway;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import javax.annotation.Resource;
@RestController
@RequestMapping("/test")
public class MqttTestController {
@Resource
private MqttGateway mqttGateway;
/**
* sendData 消息
* topic 訂閱主題
* **/
@RequestMapping("/sendMqtt1")
public String sendMqtt(String sendData, String topic){
mqttGateway.sendToMqtt(topic, sendData);
return "OK";
}
/**
* sendData 消息
* qos 消息級別 (對應QOS0、QOS1,QOS2)
* topic 訂閱主題
* **/
@RequestMapping("/sendMqtt2")
public String sendMqtt(String sendData, int qos, String topic){
mqttGateway.sendToMqtt(topic, qos, sendData);
return "OK";
}
}
6,mqtt客戶端消息處理類
package com.zxk.mqtt.handle;
import com.alibaba.fastjson.JSONObject;
import lombok.extern.slf4j.Slf4j;
import org.springframework.integration.mqtt.support.MqttHeaders;
import org.springframework.messaging.Message;
import org.springframework.stereotype.Component;
/**
* mqtt客戶端消息處理類
* **/
@Slf4j
@Component
public class MqttReceiveHandle {
public void handle(Message<?> message){
log.info("主題:{},QOS:{},消息接收到的數據:{}", message.getHeaders().get(MqttHeaders.RECEIVED_TOPIC), message.getHeaders().get(MqttHeaders.RECEIVED_QOS), message.getPayload());
}
}
7,測試發送 接受消息 (由於本推送和接受消息 是寫在一起的,所以推送和接收是可以同時看到的)
至此mqtt推送消息端和客戶端編寫完畢。
mqtt常用的客戶端測試工具:
通信貓調試助手:http://www.tongxinmao.com/Topic/Detail/id/6
MQTT.fx 是目前主流的mqtt客戶端: