MqttCallback接口裏面只有個3方法
public interface MqttCallback {
void connectionLost(Throwable var1);
void messageArrived(String var1, MqttMessage var2) throws Exception;
void deliveryComplete(IMqttDeliveryToken var1);
}
connectionLost是在連接已經連上且丟失後走這裏
messageArrived這個是消息發送到接收端時觸發
deliveryComplete這個是發送完成
MqttCallbackExtended是繼承了MqttCallback
public interface MqttCallbackExtended extends MqttCallback {
void connectComplete(boolean var1, String var2);
}
這個方法表示,丟失重連成功後會觸發。
廢話不多說,直接上代碼。
pom.xml中添加
<dependency>
<groupId>org.eclipse.paho</groupId>
<artifactId>org.eclipse.paho.client.mqttv3</artifactId>
<version>1.2.2</version>
</dependency>
消息接收端:MqttConsumers.java
package com.mqtt;
import javax.annotation.Resource;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
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.MqttConnectOptions;
import org.eclipse.paho.client.mqttv3.MqttException;
import org.eclipse.paho.client.mqttv3.MqttMessage;
import org.eclipse.paho.client.mqttv3.MqttSecurityException;
import org.eclipse.paho.client.mqttv3.persist.MemoryPersistence;
import org.springframework.stereotype.Component;
import com.dlysapie.mqtt.bo.ReceiveMsg;
import com.tenet.util.DateUtil;
/**
* 消息接收端
*
* @author libaibai
* @version 1.0 2020年3月17日
*/
@Component
public class MqttConsumers implements MqttCallbackExtended {
private static final Logger LOG = LogManager.getLogger(MqttConsumers.class);
public static final String HOST = "tcp://rmqtt-test.xxx.cn:1883";
public static final String TOPIC = "SmartMeter/server/#"; // 訂閱主題
private static final String clientid = "client";
private MqttClient client;
private MqttConnectOptions options;
// private String userName = "test";
// private String passWord = "test";
@Resource
public ReceiveMsg receiveMsg;
public MqttConsumers() {
connect();
}
// 連接
private void connect() {
try {
if (client == null) {
// host爲主機名,test爲clientid即連接MQTT的客戶端ID,一般以客戶端唯一標識符表示,MemoryPersistence設置clientid的保存形式,默認爲以內存保存
client = new MqttClient(HOST, clientid, new MemoryPersistence());
}
// MQTT的連接設置
options = 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
options.setCleanSession(true);
// 設置連接的用戶名
// options.setUserName(userName);
// 設置連接的密碼
// options.setPassword(passWord.toCharArray());
// 設置超時時間 單位爲秒
options.setConnectionTimeout(10);
// 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個消息判斷客戶端是否在線,但這個方法並沒有重連的機制
options.setKeepAliveInterval(20);
// mqttClient.reconnect(); 方法會判斷這個參數
options.setAutomaticReconnect(true);
// 設置回調
client.setCallback(this);
// MqttTopic topic = client.getTopic(TOPIC);
// setWill方法,如果項目中需要知道客戶端是否掉線可以調用該方法。設置最終端口的通知消息
// options.setWill(topic, "close".getBytes(), 0, true);
client.connect(options);
// 訂閱消息
int[] Qos = { 1 };
String[] topic1 = { TOPIC };
client.subscribe(topic1, Qos);
} catch (Exception e) {
e.printStackTrace();
}
}
public void disconnect() {
try {
client.disconnect();
} catch (MqttException e) {
e.printStackTrace();
}
}
// 重新鏈接
public void startReconnect() {
if (!client.isConnected()) {
try {
client.connect();
} catch (MqttSecurityException e) {
e.printStackTrace();
} catch (MqttException e) {
e.printStackTrace();
}
}
}
@Override
public void connectionLost(Throwable cause) {
LOG.info("連接斷開,正在重新連接...:");
startReconnect();
LOG.info("重新連接成功");
}
@Override
public void messageArrived(String topic, MqttMessage message) throws Exception {
// subscribe後得到的消息會執行到這裏面
System.out.println("接收消息主題:" + topic);
// System.out.println("接收消息Qos:" + message.getQos());
String payload = new String(message.getPayload());
System.out.println("接收消息內容:" + payload + " , " + DateUtil.getTimeStampToDate(DateUtil.getTimeStampLong()));
// 這裏是業務處理代碼
receiveMsg.exe(topic, payload);
}
@Override
public void deliveryComplete(IMqttDeliveryToken token) {
// TODO Auto-generated method stub
System.out.println("deliveryComplete---------" + token.isComplete());
}
@Override
public void connectComplete(boolean reconnect, String serverURI) {
// 連接成功後調用
int[] Qos = { 1 };
String[] topic1 = { TOPIC };
try {
client.subscribe(topic1, Qos);
} catch (MqttException e) {
} // 具體訂閱代碼
}
public static void main(String[] args) throws MqttException {
MqttConsumers client = new MqttConsumers();
client.connect();
}
}
消息發佈端:MqttPublisher.java
package com.mqtt;
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.context.annotation.Bean;
import org.springframework.stereotype.Component;
/**
* 發送消息服務類
*
* @author libaibai
* @version 1.0 2020年3月17日
*/
@Component
public class MqttPublisher {
public static final String HOST = "tcp://rmqtt-test.xxxx:1883";
private static final String clientid = "server";
@Bean("mqttClient")
public MqttClient connect() throws MqttException {
MemoryPersistence persistence = new MemoryPersistence();
MqttConnectOptions connOpts = new MqttConnectOptions();
connOpts.setCleanSession(true);
connOpts.setConnectionTimeout(10);// 設置超時時間
connOpts.setKeepAliveInterval(20);// 設置會話心跳時間
// String[] uris = {"tcp://10.100.124.206:1883","tcp://10.100.124.207:1883"};
// connOpts.setServerURIs(uris); //起到負載均衡和高可用的作用
MqttClient mqttClient = new MqttClient(HOST, clientid, persistence);
mqttClient.connect(connOpts);
return mqttClient;
}
}
消息發佈業務處理:PushlishMsg.java
package com.mqtt.bo;
import java.util.Arrays;
import javax.annotation.Resource;
import org.apache.commons.lang3.ArrayUtils;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.eclipse.paho.client.mqttv3.MqttClient;
import org.eclipse.paho.client.mqttv3.MqttException;
import org.eclipse.paho.client.mqttv3.MqttMessage;
import org.eclipse.paho.client.mqttv3.MqttPersistenceException;
import org.springframework.stereotype.Component;
import com.dlysapie.mqtt.MqttPublisher;
import com.dlysapie.mqtt.util.AesUtils;
import com.dlysapie.mqtt.util.CommUtil;
/**
* 命令發送類
*
* @author libaibai
* @version 1.0 2020年3月20日
*/
@Component
public class PublishMsg {
private static final Logger LOG = LogManager.getLogger(PublishMsg.class);
// 發佈主題
public static final String topic = "SmartMeter/device/ce1f5bdbc4494f4db5194e3a1c30ab00/register";
@Resource
public MqttClient mqttClient;
// 發送配置aes祕鑰
public void sendAesKey() {
byte cmd = 3;
byte[] pudDateByte = AesUtils.AESKEY.getBytes();
// 添加類型屬性
byte[] pudDateType = { 16, (byte) AesUtils.AESKEY.length() };
byte[] payload = CommUtil.getPayLoad(cmd, ArrayUtils.addAll(pudDateType, pudDateByte));
System.out.println("發送祕鑰原始數據(base64轉碼)" + Arrays.toString(payload));
try {
mqttClient.publish(topic, getMessage(payload));
} catch (MqttPersistenceException e) {
e.printStackTrace();
} catch (MqttException e) {
e.printStackTrace();
}
}
/**
* 得到發送的message
*
* @param payload 消息字節數組
* @return
*/
public MqttMessage getMessage(byte[] payload) {
MqttMessage message = new MqttMessage();
message.setQos(1);
message.setRetained(true);
message.setPayload(payload);
return message;
}
}
有問題的,歡迎指出。