springboot集成mqtt，及本地搭建emqX服务测试案例
springboot项目集成mqtt
1、引入pom依赖
<!-- MQTT -->
<dependency>
<groupId>org.springframework.integration</groupId>
<artifactId>spring-integration-mqtt</artifactId>
</dependency>
2、yml文件配置
# Mqtt配置
mqtt:
#我是在本地搭建了emqx服务，192.168.2.31就是我本地emqx服务的地址。也可用公共测试不需要搭建emqx服务，将ip改为broker.emqx.io即可。
serverURIs: tcp://192.168.2.31:1883
username: admin #可不填写
password: public #可不填写
qos: 1 #等级 有 0 1 2 三种
clientId: mqttx_d48b
topic: topic_ljh #订阅的主题，多个时可以使用逗号分开 如：topic1，topic2，topic
enabled: true #是否打开mqtt服务
keepalive: 100 #心跳时间 不需要动
timeout: 100 # 超时时间秒 不需要动
3、MqttConfig （用来获取yml中配置的参数&启动订阅主题功能）
package com.boc.ljh.utils.mqtt;
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;
/**
* @Author: ljh
* @ClassName MqttConfig
* @Description TODO
* @date 2022/7/14 18:09
* @Version 1.0
*/
@Configuration
public class MqttConfig {
@Autowired
private MqttPushClient mqttPushClient;
@Value("${mqtt.username:{null}}")
private String username;
@Value("${mqtt.password:{null}}")
private String password;
@Value("${mqtt.serverURIs:{null}}")
private String hostUrl;
@Value("${mqtt.clientId:{null}}")
private String clientId;
@Value("${mqtt.topic:{null}}")
private String defaultTopic;
@Value("${mqtt.qos:{null}}")
private int qos;
@Value("${mqtt.enabled:{null}}")
private boolean enabled;
@Value("${mqtt.keepalive:{null}}")
private int keepalive;
@Value("${mqtt.timeout:{null}}")
private int timeout;
@Bean
public MqttPushClient getMqttPushClient() {
if(enabled == true){
String mqtt_topic[] = defaultTopic.split(",");
mqttPushClient.connect(hostUrl, clientId, username, password, timeout, keepalive);//连接
for(int i=0; i<mqtt_topic.length; i++){
mqttPushClient.subscribe(mqtt_topic[i], 0);//订阅主题
}
}
return mqttPushClient;
}
}
4、MqttPushClient（发布&订阅主题的详细方法，执行发布&订阅操作时调用即可）
package com.boc.ljh.utils.mqtt;
import org.eclipse.paho.client.mqttv3.*;
import org.eclipse.paho.client.mqttv3.persist.MemoryPersistence;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
/**
* @Author: ljh
* @ClassName MqttPushClient
* @Description TODO
* @date 2022/7/15 15:15
* @Version 1.0
*/
@Component
public class MqttPushClient {
private static final Logger logger = LoggerFactory.getLogger(MqttPushClient.class);
@Autowired
private PushCallback pushCallback;
private static MqttClient client;
private static MqttClient getClient() {
return client;
}
private static void setClient(MqttClient client) {
MqttPushClient.client = client;
}
/**
* 客户端连接
*
* @param host ip+端口
* @param clientID 客户端Id
* @param username 用户名
* @param password 密码
* @param timeout 超时时间
* @param keepalive 保留数
*/
public void connect(String host, String clientID, String username, String password, int timeout, int keepalive) {
MqttClient client;
try {
client = new MqttClient(host, clientID, new MemoryPersistence());
MqttConnectOptions options = new MqttConnectOptions();
options.setCleanSession(true);
options.setUserName(username);
options.setPassword(password.toCharArray());
options.setConnectionTimeout(timeout);
options.setKeepAliveInterval(keepalive);
MqttPushClient.setClient(client);
try {
client.setCallback(pushCallback);
client.connect(options);
} catch (Exception e) {
e.printStackTrace();
}
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 发布
*
* @param qos 连接方式
* @param retained 是否保留
* @param topic 主题
* @param pushMessage 消息体
*/
public boolean publish(int qos, boolean retained, String topic, String pushMessage) {
MqttMessage message = new MqttMessage();
message.setQos(qos);
message.setRetained(retained);
message.setPayload(pushMessage.getBytes());
MqttTopic mTopic = MqttPushClient.getClient().getTopic(topic);
if (null == mTopic) {
logger.error("topic not exist");
}
MqttDeliveryToken token;
try {
token = mTopic.publish(message);
token.waitForCompletion();
return true;
} catch (MqttPersistenceException e) {
e.printStackTrace();
return false;
} catch (MqttException e) {
e.printStackTrace();
return false;
}
}
/**
* 订阅某个主题
*
* @param topic 主题
* @param qos 连接方式
*/
public void subscribe(String topic, int qos) {
logger.info("开始订阅主题" + topic);
try {
MqttPushClient.getClient().subscribe(topic, qos);
} catch (MqttException e) {
e.printStackTrace();
}
}
}
5、PushCallback（主要打印接收数据和响应的结果）
package com.boc.ljh.utils.mqtt;
import com.alibaba.fastjson.JSONObject;
import org.eclipse.paho.client.mqttv3.IMqttDeliveryToken;
import org.eclipse.paho.client.mqttv3.MqttCallback;
import org.eclipse.paho.client.mqttv3.MqttClient;
import org.eclipse.paho.client.mqttv3.MqttMessage;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
/**
* @Author: ljh
* @ClassName PushCallback
* @Description TODO
* @date 2022/7/15 15:16
* @Version 1.0
*/
@Component
public class PushCallback implements MqttCallback{
private static final Logger logger = LoggerFactory.getLogger(MqttPushClient.class);
@Autowired
private MqttConfig mqttConfig;
private static MqttClient client;
private static String _topic;
private static String _qos;
private static String _msg;
@Override
public void connectionLost(Throwable throwable) {
// 连接丢失后，一般在这里面进行重连
logger.info("连接断开，可以做重连");
if (client == null || !client.isConnected()) {
mqttConfig.getMqttPushClient();
}
}
@Override
public void messageArrived(String topic, MqttMessage mqttMessage) throws Exception {
// subscribe后得到的消息会执行到这里面
logger.info("接收消息主题 : " + topic);
logger.info("接收消息Qos : " + mqttMessage.getQos());
logger.info("接收消息内容 : " + new String(mqttMessage.getPayload()));
_topic = topic;
_qos = mqttMessage.getQos()+"";
_msg = new String(mqttMessage.getPayload());
}
@Override
public void deliveryComplete(IMqttDeliveryToken iMqttDeliveryToken) {
logger.info("deliveryComplete---------" + iMqttDeliveryToken.isComplete());
}
//别的Controller层会调用这个方法来 获取 接收到的硬件数据
public String receive() {
JSONObject jsonObject = new JSONObject();
jsonObject.put("topic", _topic);
jsonObject.put("qos", _qos);
jsonObject.put("msg", _msg);
return jsonObject.toString();
}
}
本地搭建EMQX服务
1、windows搭建
使用下面链接下载emqx
链接：https://pan.baidu.com/s/1wuJMss0JIZAn6ayaCbOtXQ?pwd=xmcm
提取码：xmcm
下载完成后随便找个地方解压文件，然后进入到bin目录中，打开cmd窗口，输入emqx start即可开启服务。emqx stop关闭服务
然后访问http://127.0.0.1:18083地址，默认用户名：admin，密码：public
2、centos7搭建emqx服务
按照顺序输入一下命令即可：
1、wget https://www.emqx.com/zh/downloads/broker/5.0.3/emqx-5.0.3-el7-amd64.tar.gz 下载emqx压缩文件
2、mkdir -p emqx && tar -zxvf emqx-5.0.3-el7-amd64.tar.gz -C emqx 解压文件
3、./emqx/bin/emqx start 启动服务
4、iptables -A INPUT -p tcp --dport 18083 -j ACCEPT 打开emqx端口
测试
1、下载工具MQTTX， 地址：https://mqttx.app/zh
2、设置中文
3、连接emqx服务，
4、发送数据
5、项目中接收数据
项目里面是订阅了topic_ljh这个主题，当往这个主题发送数据的时候，项目里面就可以接收到数据内容。
发送到topic_ljh主题
