ActiveMq持久订阅小例子

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public class ProducerTopic {    public static void main(String[] args) throws JMSException {        String user = ActiveMQConnectionFactory.DEFAULT_USER;        String password = ActiveMQConnectionFactory.DEFAULT_PASSWORD;        String brokerUrl = "tcp://hadoop2:61616";        ConnectionFactory connectionFactory = new ActiveMQConnectionFactory(user, password, brokerUrl);        /**         * 创建连接并开启         */        Connection connection = connectionFactory.createConnection();        /**         * 创建session         * 参数1：不启动事务         * 参数2：签收模式为自动签收         */        Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);        /**         * 创建topic或者queue         */        Topic topic_2 = session.createTopic("topic_2");        /**         * 创建生产者         */        MessageProducer producer = session.createProducer(topic_2);        //此生产者生产的数据持久化        producer.setDeliveryMode(DeliveryMode.PERSISTENT);        /**         * 注意，一定要在设置了持久化之后再启动connection         */        connection.start();        /**         * 生产数据         */        for (int i = 0; i < 10; i++) {            TextMessage textMessage = session.createTextMessage();            textMessage.setText("hello java " + i);            producer.send(textMessage);        }        /**         * 释放连接         */        connection.close();    }}

public class ConsumerTopic {    public static void main(String[] args) {        String user = ActiveMQConnectionFactory.DEFAULT_USER;        String password = ActiveMQConnectionFactory.DEFAULT_PASSWORD;        String brokerUrl = "tcp://hadoop2:61616";        ConnectionFactory connectionFactory = new ActiveMQConnectionFactory(user, password, brokerUrl);        Connection connection = null;        try {            /**             * 创建连接并开启，注册一个客户号，让broker知道是谁订阅了。             * 需要在producer发消息之前，先运行一下此程序，目的是注册订阅信息，然后就可以关闭程序             * 这样就可以做到再次启动时，收到离线的消息。             */            connection = connectionFactory.createConnection();            connection.setClientID("c1");            /**             * 创建session             * 参数1：不启动事务             * 参数2：签收模式为自动签收             */            Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);            /**             * 创建topic或者queue             */            Topic topic_2 = session.createTopic("topic_2");            //对于topic_2,建立持久订阅，名字随便起            TopicSubscriber durableSubscriber = session.createDurableSubscriber(topic_2, "somebody");            connection.start();            /**             * 消费数据             */            while (true) {                TextMessage textMessage = (TextMessage) durableSubscriber.receive();                System.out.println("消费消息：" + textMessage.getText());            }        } catch (Exception e) {            e.printStackTrace();        } finally {            if (connection != null) {                try {                    connection.close();                } catch (JMSException e) {                    e.printStackTrace();                }            }        }    }}

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