Apache ActiveMQ 实践 <二>

一.订阅/发布模式

1.生产者

/**
 * 消息生产者
 *
 */
public class JMSProducer {

   private static final String USERNAME=ActiveMQConnection.DEFAULT_USER;
   private static final String PASSWORD=ActiveMQConnection.DEFAULT_PASSWORD;
   private static final String BROKEURL=ActiveMQConnection.DEFAULT_BROKER_URL;
   private static final int SENDNUM=10;

   public static void main(String[] args) {

      ConnectionFactory connectionFactory;
      Connection connection = null;
      Session session;
      Destination destination;
      MessageProducer messageProducer;

      connectionFactory=new ActiveMQConnectionFactory
            (JMSProducer.USERNAME, JMSProducer.PASSWORD, JMSProducer.BROKEURL);

      try {
         connection=connectionFactory.createConnection();
         connection.start();
         session=connection.createSession(Boolean.TRUE, Session.AUTO_ACKNOWLEDGE);
         destination=session.createTopic("FirstTopic1"); //创建topic，为目的地
 messageProducer=session.createProducer(destination); //创建消息生产者
 sendMessage(session, messageProducer);  //发送消息
 session.commit();  //提交session
 } catch (Exception e) {
         // TODO Auto-generated catch block
 e.printStackTrace();
      } finally{
         if(connection!=null){
            try {
               connection.close();
            } catch (JMSException e) {
               // TODO Auto-generated catch block
 e.printStackTrace();
            }
         }
      }
   }

   /**
 *发送消息
 */
 public static void sendMessage(Session session,MessageProducer messageProducer)throws Exception{
      for(int i=0;i<JMSProducer.SENDNUM;i++){
         TextMessage message=session.createTextMessage("ActiveMQ 发送消息"+i);
         System.out.println("发送消息："+"ActiveMQ 发送的消息："+i);
         messageProducer.send(message);
      }
   }
}

2.消息消费者

/**
 * 消息消费者
 *
 */
public class JMSConsumer2 {

   private static final String USERNAME=ActiveMQConnection.DEFAULT_USER;
   private static final String PASSWORD=ActiveMQConnection.DEFAULT_PASSWORD;
   private static final String BROKEURL=ActiveMQConnection.DEFAULT_BROKER_URL;

   public static void main(String[] args) {
      ConnectionFactory connectionFactory;
      Connection connection = null;
      Session session;
      Destination destination;
      MessageConsumer messageConsumer;

      connectionFactory=new ActiveMQConnectionFactory
            (JMSConsumer2.USERNAME, JMSConsumer2.PASSWORD, JMSConsumer2.BROKEURL);

      try {
         connection=connectionFactory.createConnection();
         connection.start();
         session=connection.createSession(Boolean.FALSE, Session.AUTO_ACKNOWLEDGE);
         destination=session.createTopic("FirstTopic1"); //指定消费的topic
         messageConsumer=session.createConsumer(destination); //创建消息消费者
         messageConsumer.setMessageListener(new Listener2()); //注册监听
 } catch (JMSException e) {
         // TODO Auto-generated catch block
 e.printStackTrace();
      } 
   }
}

3.监听器

/**
 * 监听器
 */
public class Listener implements MessageListener{

   @Override
 public void onMessage(Message message) {
      // TODO Auto-generated method stub
 try {
         System.out.println("监听器："+((TextMessage)message).getText());
      } catch (JMSException e) {
         // TODO Auto-generated catch block
 e.printStackTrace();
      }
   }

}

分别运行生产者，消费者代码，观察控制台