activemq 话题模式(三)

生产者

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package com.test.producermq;   import org.apache.activemq.ActiveMQConnectionFactory;   import javax.jms.*;   /**  * @Title: MessageProducer  * @ProjectName activemq  * @date 2019/11/89:49  */ public class MessageProducer2 {     //定义ActivMQ的连接地址     private static final String ACTIVEMQ_URL = "tcp://127.0.0.1:61616";     //定义发送消息的主题名称     private static final String TOPIC_NAME = "MyTopicMessage";       public static void main(String[] args) throws JMSException {         //1创建连接工厂         ActiveMQConnectionFactory activeMQConnectionFactory = new ActiveMQConnectionFactory(ACTIVEMQ_URL);         //2创建连接         Connection connection = activeMQConnectionFactory.createConnection();         //3打开连接         connection.start();         //4创建会话         Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);         //5创建队列目标         Destination destination = session.createTopic(TOPIC_NAME);         //6创建一个生产者         javax.jms.MessageProducer producer = session.createProducer(destination);         //创建模拟100个消息         for (int i = 1; i <= 100; i++) {             TextMessage message = session.createTextMessage("当前message是(主题模型):" + i);             //发送消息             producer.send(message);             //在本地打印消息             System.out.println("我现在发的消息是：" + message.getText());         }         //关闭连接         connection.close();     } }

　消费者

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package com.test.consumemq;   import org.apache.activemq.ActiveMQConnectionFactory;   import javax.jms.*;   /**  * @Title: MessageConsumer  * @ProjectName activemq  * @date 2019/11/89:56  */ public class MessageConsumer2 {     //定义ActivMQ的连接地址     private static final String ACTIVEMQ_URL = "tcp://127.0.0.1:61616";     //定义发送消息的队列名称     private static final String TOPIC_NAME = "MyTopicMessage";     public static void main(String[] args) throws JMSException {         //1创建连接工厂         ActiveMQConnectionFactory activeMQConnectionFactory = new ActiveMQConnectionFactory(ACTIVEMQ_URL);         //2创建连接         Connection connection = activeMQConnectionFactory.createConnection();         //3打开连接         connection.start();         //4创建会话         Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);         //5创建队列目标         Destination destination = session.createTopic(TOPIC_NAME);         //6创建消费者         javax.jms.MessageConsumer consumer = session.createConsumer(destination);         //创建消费的监听         consumer.setMessageListener(new MessageListener() {             @Override             public void onMessage(Message message) {                 TextMessage textMessage = (TextMessage) message;                 try {                     System.out.println("2获取消息：" + textMessage.getText());                 } catch (JMSException e) {                     e.printStackTrace();                 }             }         });     } }

　　如果消费者是在生产者产生消息之后来的，那么是不会对之前的消息进行消费的

       所有订阅者都会受到发布者的消息