订阅模式（publish-subscribe）

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SendTopic（发送端）

package topic;import javax.jms.Connection;import javax.jms.ConnectionFactory;import javax.jms.DeliveryMode;import javax.jms.Destination;import javax.jms.MessageProducer;import javax.jms.Session;import javax.jms.TextMessage; import org.apache.activemq.ActiveMQConnection;import org.apache.activemq.ActiveMQConnectionFactory; public class SendTopic {    private static final int SEND_NUMBER = 5;    public static void sendMessage(Session session, MessageProducer producer)            throws Exception {         for ( int i = 1; i <= SEND_NUMBER; i++) {            TextMessage message = session                    .createTextMessage("ActiveMq发送的消息" + i);            //发送消息到目的地方            System. out.println("发送消息：" + "ActiveMq 发送的消息" + i);            producer.send(message);        }    }       public static void main(String[] args) {        // ConnectionFactory：连接工厂，JMS用它创建连接        ConnectionFactory connectionFactory;        // Connection：JMS客户端到JMS Provider的连接        Connection connection = null;        // Session：一个发送或接收消息的线程        Session session;        // Destination：消息的目的地;消息发送给谁.        Destination destination;        // MessageProducer：消息发送者        MessageProducer producer;        // TextMessage message;        //构造ConnectionFactory实例对象，此处采用ActiveMq的实现jar        connectionFactory = new ActiveMQConnectionFactory(                ActiveMQConnection. DEFAULT_USER,                ActiveMQConnection. DEFAULT_PASSWORD,                "tcp://localhost:61616");        try {            //构造从工厂得到连接对象            connection = connectionFactory.createConnection();            //启动            connection.start();            //获取操作连接            session = connection.createSession( true, Session. AUTO_ACKNOWLEDGE);            //获取session注意参数值FirstTopic是一个服务器的topic(与queue消息的发送相比，这里是唯一的不同)            destination = session.createTopic("FirstTopic");            //得到消息生成者【发送者】            producer = session.createProducer(destination);            //设置不持久化，此处学习，实际根据项目决定            producer.setDeliveryMode(DeliveryMode. PERSISTENT);            //构造消息，此处写死，项目就是参数，或者方法获取            sendMessage(session, producer);            session.commit();        } catch (Exception e) {            e.printStackTrace();        } finally {            try {                if ( null != connection)                    connection.close();            } catch (Throwable ignore) {            }        }    }}

ReceiveTopic（消费端）

package topic;import javax.jms.Connection;import javax.jms.ConnectionFactory;import javax.jms.Destination;import javax.jms.MessageConsumer;import javax.jms.Session;import javax.jms.TextMessage; import org.apache.activemq.ActiveMQConnection;import org.apache.activemq.ActiveMQConnectionFactory;public class ReceiveTopic implements Runnable {    private String threadName;    ReceiveTopic(String threadName) {         this.threadName = threadName;    }    public void run() {         // ConnectionFactory：连接工厂，JMS用它创建连接         ConnectionFactory connectionFactory;         // Connection：JMS客户端到JMS Provider的连接         Connection connection = null;         // Session：一个发送或接收消息的线程         Session session;         // Destination：消息的目的地;消息发送给谁.         Destination destination;         //消费者，消息接收者         MessageConsumer consumer;         connectionFactory = new ActiveMQConnectionFactory(                    ActiveMQConnection. DEFAULT_USER,                    ActiveMQConnection. DEFAULT_PASSWORD,"tcp://localhost:61616");         try {               //构造从工厂得到连接对象               connection = connectionFactory.createConnection();               //启动               connection.start();               //获取操作连接,默认自动向服务器发送接收成功的响应               session = connection.createSession( false, Session. AUTO_ACKNOWLEDGE);               //获取session注意参数值FirstTopic是一个服务器的topic               destination = session.createTopic("FirstTopic");               consumer = session.createConsumer(destination);               while ( true) {                    //设置接收者接收消息的时间，为了便于测试，这里设定为100s                    TextMessage message = (TextMessage) consumer                                .receive(100 * 1000);                    if ( null != message) {                          System. out.println("线程"+threadName+"收到消息:" + message.getText());                    } else {                          continue;                    }               }         } catch (Exception e) {               e.printStackTrace();         } finally {               try {                    if ( null != connection)                          connection.close();               } catch (Throwable ignore) {               }         }    }    public static void main(String[] args) {          //这里启动3个线程来监听FirstTopic的消息，与queue的方式不一样三个线程都能收到同样的消息         ReceiveTopic receive1= new ReceiveTopic("thread1");         ReceiveTopic receive2= new ReceiveTopic("thread2");         ReceiveTopic receive3= new ReceiveTopic("thread3");         Thread thread1= new Thread(receive1);         Thread thread2= new Thread(receive2);         Thread thread3= new Thread(receive3);         thread1.start();         thread2.start();         thread3.start();    }}

所需包

效果

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