MQTT org.fusesource.mqtt 实例

Bertha 。 2022-08-13 16:39 155阅读 0赞

最新maven 依赖

<dependency>
      <groupId>org.fusesource.mqtt-client</groupId>
      <artifactId>mqtt-client</artifactId>
      <version>1.10</version>
    </dependency>

Server发布主题

package com.etrip.mqtt.future;
    
    import java.net.URISyntaxException;
    
    import org.fusesource.mqtt.client.FutureConnection;
    import org.fusesource.mqtt.client.MQTT;
    import org.fusesource.mqtt.client.QoS;
    import org.fusesource.mqtt.client.Topic;
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    
    /**
     * 
     * 
     * 
     * 采用Future式 发布主题 
     * 
     * @author longgangbai
     */
    public class MQTTFutureServer {
    	    private static final Logger LOG = LoggerFactory.getLogger(MQTTFutureServer.class);
    		private final static String CONNECTION_STRING = "tcp://192.168.208.46:1883";
    		private final static boolean CLEAN_START = true;
    		private final static short KEEP_ALIVE = 30;// 低耗网络，但是又需要及时获取数据，心跳30s
    		public  static Topic[] topics = {
    			    		new Topic("china/beijing", QoS.EXACTLY_ONCE),
    			    		new Topic("china/tianjin", QoS.AT_LEAST_ONCE),
    			    		new Topic("china/henan", QoS.AT_MOST_ONCE)};
    		public final  static long RECONNECTION_ATTEMPT_MAX=6;
    		public final  static long RECONNECTION_DELAY=2000;
    		
    		public final static int SEND_BUFFER_SIZE=2*1024*1024;//发送最大缓冲为2M
    		public static void main(String[] args)   {
    		    MQTT mqtt = new MQTT();
    		    try {
    				//设置服务端的ip
    				mqtt.setHost(CONNECTION_STRING);
    				//连接前清空会话信息
    				mqtt.setCleanSession(CLEAN_START);
    				//设置重新连接的次数
    				mqtt.setReconnectAttemptsMax(RECONNECTION_ATTEMPT_MAX);
    				//设置重连的间隔时间
    				mqtt.setReconnectDelay(RECONNECTION_DELAY);
    				//设置心跳时间
    				mqtt.setKeepAlive(KEEP_ALIVE);
    				//设置缓冲的大小
    				mqtt.setSendBufferSize(SEND_BUFFER_SIZE);
    	
    				//创建连接 
    				final FutureConnection connection= mqtt.futureConnection();
    				connection.connect();
    				int count=1;
    				while(true){
    				 	count++;
     		            // 用于发布消息，目前手机段不需要向服务端发送消息
                    	//主题的内容
    			    	String message="hello "+count+"chinese people !";
    					String topic = "china/beijing";
    					connection.publish(topic, message.getBytes(), QoS.AT_LEAST_ONCE,
    							false);
    					System.out.println("MQTTFutureServer.publish Message "+"Topic Title :"+topic+" context :"+message);
    					
    				}
    			} catch (URISyntaxException e) {
    				// TODO Auto-generated catch block
    				e.printStackTrace();
    			} catch (Exception e) {
    				// TODO Auto-generated catch block
    				e.printStackTrace();
    			}
    		}
    }

Client接收主题

package com.etrip.mqtt.future;
    
    import java.net.URISyntaxException;
    
    import org.fusesource.mqtt.client.Future;
    import org.fusesource.mqtt.client.FutureConnection;
    import org.fusesource.mqtt.client.MQTT;
    import org.fusesource.mqtt.client.Message;
    import org.fusesource.mqtt.client.QoS;
    import org.fusesource.mqtt.client.Topic;
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    /**
     * 
     * MQTT moquette 的Client 段用于订阅主题，并接收主题信息
     * 
     * 采用Future 式 订阅主题 
     * 
     * @author longgangbai
     */
    public class MQTTFutureClient {
    	    private static final Logger LOG = LoggerFactory.getLogger(MQTTFutureClient.class);
    		private final static String CONNECTION_STRING = "tcp://192.168.208.46:1883";
    		private final static boolean CLEAN_START = true;
    		private final static short KEEP_ALIVE = 30;// 低耗网络，但是又需要及时获取数据，心跳30s
    		private final static String CLIENT_ID = "publishService";
    		public  static Topic[] topics = {
    			    		new Topic("china/beijing", QoS.EXACTLY_ONCE),
    			    		new Topic("china/tianjin", QoS.AT_LEAST_ONCE),
    			    		new Topic("china/henan", QoS.AT_MOST_ONCE)};
    		public final  static long RECONNECTION_ATTEMPT_MAX=6;
    		public final  static long RECONNECTION_DELAY=2000;
    		
    		public final static int SEND_BUFFER_SIZE=2*1024*1024;//发送最大缓冲为2M
    		
    		
    		  public static void main(String[] args)   {
    				//创建MQTT对象
    			    MQTT mqtt = new MQTT();
    			    try {
    			    	//设置mqtt broker的ip和端口
    					mqtt.setHost(CONNECTION_STRING);
    					//连接前清空会话信息
    					mqtt.setCleanSession(CLEAN_START);
    					//设置重新连接的次数
    					mqtt.setReconnectAttemptsMax(RECONNECTION_ATTEMPT_MAX);
    					//设置重连的间隔时间
    					mqtt.setReconnectDelay(RECONNECTION_DELAY);
    					//设置心跳时间
    					mqtt.setKeepAlive(KEEP_ALIVE);
    					//设置缓冲的大小
    					mqtt.setSendBufferSize(SEND_BUFFER_SIZE);
    					
    					//获取mqtt的连接对象BlockingConnection
    					final FutureConnection connection= mqtt.futureConnection();
    					connection.connect();
    					connection.subscribe(topics);
    					while(true){
    						Future<Message> futrueMessage=connection.receive();
    						Message message =futrueMessage.await();
    						
    						
    						System.out.println("MQTTFutureClient.Receive Message "+ "Topic Title :"+message.getTopic()+" context :"+String.valueOf(message.getPayloadBuffer()));
    					}
    				} catch (URISyntaxException e) {
    					// TODO Auto-generated catch block
    					e.printStackTrace();
    				} catch (Exception e) {
    					// TODO Auto-generated catch block
    					e.printStackTrace();
    				}finally{
    					
    				}
    		  	}
    }