使用sprintboot 优雅的整合 mqtt

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mqtt 有许多实现的产品，这里使用国内使用比较多的emqx，可以参考 emqx安装 来安装环境

emqx 官方有提供java示例来连接mqtt：传送门

下面我使用springboot 来优雅的整合下

创建springboot 工程

pom

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.6.0</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>top.wushanghui</groupId>
    <artifactId>mqtt-client</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>mqtt-client</name>
    <description>mqtt-client</description>
    <properties>
        <java.version>11</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-configuration-processor</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>org.eclipse.paho</groupId>
            <artifactId>org.eclipse.paho.client.mqttv3</artifactId>
            <version>1.2.5</version>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

主要是引入mqtt依赖：

<dependency>
    <groupId>org.eclipse.paho</groupId>
    <artifactId>org.eclipse.paho.client.mqttv3</artifactId>
    <version>1.2.5</version>
</dependency>

配置文件(yml)

application.yml

spring:
  profiles:
    active: dev

application-dev.yml

server:
  port: 8080
emqx:
  host: tcp://192.168.33.10:1883
  clientId: MQTT_IOT_DEFAULT_CLIENT
  username:
  password:
  timeout: 1000
  keepAlive: 60

配置类

EmqxProperties

package top.wushanghui.mqttclient.config;

import lombok.Getter;
import lombok.Setter;
import lombok.ToString;
import org.springframework.boot.context.properties.ConfigurationProperties;

/**
 * @author 吴尚慧
 * @since 2021/11/11 19:26
 */
@Getter
@Setter
@ToString
@ConfigurationProperties(prefix = "emqx")
public class EmqxProperties {

    private String host;
    private String clientId;
    private String username;
    private String password;
    private Integer timeout;
    private Integer keepAlive;

}

EmqxConfiguration

package top.wushanghui.mqttclient.config;

import lombok.extern.slf4j.Slf4j;
import org.eclipse.paho.client.mqttv3.MqttClient;
import org.eclipse.paho.client.mqttv3.MqttConnectOptions;
import org.eclipse.paho.client.mqttv3.MqttException;
import org.eclipse.paho.client.mqttv3.persist.MemoryPersistence;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import top.wushanghui.mqttclient.callback.MyPushCallback;
import top.wushanghui.mqttclient.enums.MqttTopicEnum;

@Slf4j
@Configuration
@EnableConfigurationProperties(EmqxProperties.class)
public class EmqxConfiguration {

    @Bean
    public MqttClient mqttClient(EmqxProperties properties, MqttConnectOptions mqttConnectOptions, MyPushCallback myPushCallback) throws MqttException {
        log.info("{}", properties);
        String cid = properties.getClientId() + System.currentTimeMillis();
        MqttClient mqttClient = new MqttClient(properties.getHost(), cid, new MemoryPersistence());
        mqttClient.setCallback(myPushCallback);
        myPushCallback.setMqttClient(mqttClient);

        mqttClient.connect(mqttConnectOptions);
        log.info("连接 emqx 成功 当前客户端id={}", mqttClient.getClientId());
        mqttClient.subscribe(MqttTopicEnum.DEFAULT_TOPIC.getTopic(), MqttTopicEnum.DEFAULT_TOPIC.getQos());
        log.info("mqttClient={}", mqttClient);
        log.info("myPushCallback={}", myPushCallback);
        return mqttClient;
    }

    @Bean
    public MqttConnectOptions mqttConnectOptions(EmqxProperties properties) {
        MqttConnectOptions options = new MqttConnectOptions();
        options.setCleanSession(true);
        options.setUserName(properties.getUsername());
        options.setPassword(properties.getPassword().toCharArray());
        options.setConnectionTimeout(properties.getTimeout());
        options.setKeepAliveInterval(properties.getKeepAlive());
        options.setAutomaticReconnect(true);
        return options;
    }

}

上述代码中，往spring容器中注入了MqttClient 对象，如果需要发布消息的话，可以直接在类中注入 MqttClient 直接使用：

mqttClient.publish(String topic, MqttMessage message)

枚举

MqttTopicEnum

package top.wushanghui.mqttclient.enums;

public enum MqttTopicEnum {

    /**
     * 默认topic
     * 使用了通配符
     */
    DEFAULT_TOPIC("sensor/+/#", 0);

    /**
     * 主题
     */
    private String topic;
    /**
     * 服务质量
     */
    private Integer qos;

    MqttTopicEnum(String topic, Integer qos) {
        this.topic = topic;
        this.qos = qos;
    }

    public String getTopic() {
        return topic;
    }

    public void setTopic(String topic) {
        this.topic = topic;
    }

    public Integer getQos() {
        return qos;
    }

    public void setQos(Integer qos) {
        this.qos = qos;
    }
}

回调(消费消息)

package top.wushanghui.mqttclient.callback;

import lombok.extern.slf4j.Slf4j;
import org.eclipse.paho.client.mqttv3.*;
import org.springframework.stereotype.Component;
import top.wushanghui.mqttclient.enums.MqttTopicEnum;

/**
 * @author 吴尚慧
 * @since 2021/11/11 20:36
 */
@Slf4j
@Component
public class MyPushCallback implements MqttCallbackExtended {

    private MqttClient mqttClient;

    @Override
    public void connectComplete(boolean reconnect, String serverURI) {
        log.info("MyPushCallback connectComplete reconnect={}, serverURI={}", reconnect, serverURI);
        if (reconnect) {
            // 重新连接后，需重新订阅主题
            try {
                log.info("mqttClient={}", mqttClient);
                mqttClient.subscribe(MqttTopicEnum.DEFAULT_TOPIC.getTopic(), MqttTopicEnum.DEFAULT_TOPIC.getQos());
            } catch (MqttException e) {
                log.error("订阅主题失败", e);
            }
        }
    }

    @Override
    public void connectionLost(Throwable cause) {
        log.error("MyPushCallback connectionLost cause={}", cause.toString());
    }

    @Override
    public void messageArrived(String topic, MqttMessage message) throws Exception {
        log.info("MyPushCallback messageArrived topic={}, message={}", topic, message);
    }

    @Override
    public void deliveryComplete(IMqttDeliveryToken token) {
        log.info("MyPushCallback deliveryComplete token={}", token);
    }

    public void setMqttClient(MqttClient mqttClient) {
        this.mqttClient = mqttClient;
    }
}

在messageArrived方法中可以消费消息。

启动服务，用工具发个消息试一下：

在这里插入图片描述

在控制台就可以收到消息：
在这里插入图片描述

需要源码的小伙伴点击：传送门

本图文内容来源于网友网络收集整理提供，作为学习参考使用，版权属于原作者。
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