package com.zy.sc.common.mqtt;
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import org.eclipse.paho.client.mqttv3.MqttClient;
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import org.eclipse.paho.client.mqttv3.MqttConnectOptions;
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import org.eclipse.paho.client.mqttv3.persist.MemoryPersistence;
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import org.springframework.beans.factory.annotation.Autowired;
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import javax.annotation.PostConstruct;
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/**
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* Created by vincent on 2021/9/15
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*/
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//@Component
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public class SubscribeSample {
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@Autowired
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private SubscribeListener subscribeListener;
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@PostConstruct
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public void init() {
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String HOST = "tcp://1.117.172.81:61613";
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String TOPIC = "mytopic";
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int qos = 1;
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String clientid = "subClient";
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String userName = "admin";
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String passWord = "password";
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try {
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// host为主机名,test为clientid即连接MQTT的客户端ID,一般以客户端唯一标识符表示,MemoryPersistence设置clientid的保存形式,默认为以内存保存
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MqttClient client = new MqttClient(HOST, clientid, new MemoryPersistence());
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// MQTT的连接设置
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MqttConnectOptions options = new MqttConnectOptions();
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// 设置是否清空session,这里如果设置为false表示服务器会保留客户端的连接记录,这里设置为true表示每次连接到服务器都以新的身份连接
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options.setCleanSession(true);
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// 设置连接的用户名
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options.setUserName(userName);
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// 设置连接的密码
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options.setPassword(passWord.toCharArray());
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// 设置超时时间 单位为秒
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options.setConnectionTimeout(10);
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// 设置会话心跳时间 单位为秒 服务器会每隔1.5*20秒的时间向客户端发送个消息判断客户端是否在线,但这个方法并没有重连的机制
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options.setKeepAliveInterval(20);
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// 设置回调函数
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client.setCallback(subscribeListener);
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client.connect(options);
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//订阅消息
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client.subscribe(TOPIC, qos);
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} catch (Exception e) {
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e.printStackTrace();
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}
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}
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}
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