activeMQ 例子(一) 简单的p2p（point to point）模式

   从 http://activemq.apache.org/download.html下载MQ的最新版本

1. 点对点消息传递

        通过点对点的消息传递模型，一个应用程序可以向另外一个应用程序发送消息。在此传递模型中，目标类型是队列（Queue）。消息首先被传送至队列目标，然后从该队列中将消息传送至对此队列进行监听的某个消费者。

如下图:

                                                                             

 

        一个队列可以关联多个队列发送方和接收方，但一条消息仅传递给一个接收方。如果多个接收方正在监听队列上的消息，JMS Provider将根据“先来者优先”的原则确定由哪个价售房接受下一条消息。如果没有接收方在监听队列，消息将保留在队列中，直至接收方连接到队列为止。这种消息传递模型是传统意义上的拉模型或轮询模型。在此列模型中，消息不时自动推动给客户端的，而是要由客户端从队列中请求获得。

2.源码附上（其实在activeMQ的下载包中，已经有很全的例子了）

生产者：

package com.liujx.activemq;import javax.jms.Connection;import javax.jms.ConnectionFactory;import javax.jms.Destination;import javax.jms.JMSException;import javax.jms.MessageProducer;import javax.jms.Session;import org.apache.activemq.ActiveMQConnection;import org.apache.activemq.ActiveMQConnectionFactory;public class TestProducer {private static final String PASSWORD=ActiveMQConnection.DEFAULT_PASSWORD;private static final String USERNAMW=ActiveMQConnection.DEFAULT_USER;private static final String URL=ActiveMQConnection.DEFAULT_BROKER_URL;private static Connection connection = null;private static Session session = null;private static MessageProducer messageproducer = null;static{ConnectionFactory amf = new ActiveMQConnectionFactory(TestProducer.USERNAMW,TestProducer.PASSWORD,TestProducer.URL);try {connection = amf.createConnection();connection.start();session = connection.createSession(true,  Session.AUTO_ACKNOWLEDGE);Destination destination = session.createQueue("liujxTest");messageproducer = session.createProducer(destination);} catch (JMSException e) {e.printStackTrace();}}public static void sendMessage(){try {messageproducer.send(session.createTextMessage("aaaaaaaaaa"));session.commit();} catch (JMSException e) {// TODO Auto-generated catch blocke.printStackTrace();}}public static void main(String[] args) {sendMessage();}}

消费者;

package com.liujx.activemq;import javax.jms.Connection;import javax.jms.ConnectionFactory;import javax.jms.Destination;import javax.jms.JMSException;import javax.jms.MessageConsumer;import javax.jms.Session;import javax.jms.TextMessage;import org.apache.activemq.ActiveMQConnection;import org.apache.activemq.ActiveMQConnectionFactory;public class TestConsumer {private static final String PASSWORD=ActiveMQConnection.DEFAULT_PASSWORD;private static final String USERNAMW=ActiveMQConnection.DEFAULT_USER;private static final String URL=ActiveMQConnection.DEFAULT_BROKER_URL;private static ConnectionFactory connectionFactory = null;private static Connection connection = null;private static Session session = null;private static MessageConsumer messageConsumer = null;static{connectionFactory = new ActiveMQConnectionFactory(USERNAMW,PASSWORD, URL);try {connection = connectionFactory.createConnection();connection.start();session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);Destination destination = session.createQueue("HelloWorld");messageConsumer = session.createConsumer(destination);} catch (JMSException e) {e.printStackTrace();}}public  void  getMessages(){while(true){try {TextMessage textMessage = (TextMessage) messageConsumer.receive(10000);if(textMessage != null){System.out.println(textMessage.getText());}else{break;}} catch (JMSException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}public static void main(String[] args) {new TestConsumer().getMessages();}}