学步园

Apache ActiveMQ是Apache软件基金会所研发的开放源码消息中间件；由于ActiveMQ是一个纯Java程式，因此只需要操作系统支援Java虚拟机，ActiveMQ便可执行。

支持Java消息服务 (JMS) 1.1 版本
Spring Framework
集群 (Clustering)
支持的编程语言包括：C、C++、C#、Delphi、Erlang、Adobe Flash、Haskell、Java、JavaScript、Perl、PHP、Pike、Python和Ruby [1]
协议支持包括：OpenWire、REST、STOMP、WS-Notification、XMPP以及AMQP

好，我们先写个demo来试试 ActiveMQ的效果.

首先我们要下载ActiveMQ，下载地址：

http://www.apache.org/dyn/closer.cgi?path=/activemq/apache-activemq/5.8.0/apache-activemq-5.8.0-bin.zip

解压后，在x:/apache-activemq-5.8.0-bin/bin 目录下执行 activemq.bat即可启动 ActiveMQ，

由于ActiveMQ内置了Jetty web服务器，当ActiveMQ启动成功后，可以通过：http://localhost:8161/admin/访问ActiveMQ的控制台，默认的用户名和密码是：admin。

至此ActiveMQ 服务已经启动了，接下来我们先将x:/apache-activemq-5.8.0-bin/activemq-all-5.8.0.jar拷贝到你的classpath目录下，利用Java写个demo来尝试一下这个消息中间件。

JmsSender：

ConnectionFactory connectionFactory = new ActiveMQConnectionFactory("tcp://127.0.0.1:61616");  
		  
	    Connection connection = connectionFactory.createConnection();  
	    connection.start();  
	    
	    Session session = connection.createSession(Boolean.TRUE, Session.AUTO_ACKNOWLEDGE);  
	    Destination destination = session.createQueue("Test.foo");  

	    MessageProducer producer = session.createProducer(destination);  
	    producer.setDeliveryMode(DeliveryMode.PERSISTENT);
	    for(int i=0; i<100; i++) {  
	        int id = i+1;
	        ObjectMessage message = session.createObjectMessage();
	        message.setObject(new User(id, "张三"+id, "123456"));
	        producer.send(message);  
	    }  
	    session.commit();
	    session.close();  
	    connection.close();  

JmsReceiver：

ConnectionFactory connectionFactory = new ActiveMQConnectionFactory("tcp://127.0.0.1:61616");  
		  
	    Connection connection = connectionFactory.createConnection();  
	    connection.start();
	  
	    final Session session = connection.createSession(Boolean.TRUE, Session.AUTO_ACKNOWLEDGE);  
	    Destination destination = session.createQueue("Test.foo");
	    
	    MessageConsumer consumer = session.createConsumer(destination);
	    //listener 方式 
	    consumer.setMessageListener(new MessageListener() { 
	 
	        public void onMessage(Message msg) { 
	        	ObjectMessage message = (ObjectMessage) msg; 
	            //TODO something.... 
	            try {
	            	User user = (User) message.getObject();
	            	System.out.println("收到消息："+user);
				} catch (JMSException e1) {
					// TODO Auto-generated catch block
					e1.printStackTrace();
				} 
	            try {
					session.commit();
				} catch (JMSException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				} 
	        } 
	 
	    }); 
	    TimeUnit.MINUTES.sleep(1); 
	  
	    session.close();  
	    connection.close();

运行后，得到如下消息：

log4j:WARN No appenders could be found for logger (org.apache.activemq.transport.WireFormatNegotiator).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
收到消息：User [id=1, username=张三1, password=123456, now=Fri Jun 28 12:04:32 CST 2013]
收到消息：User [id=2, username=张三2, password=123456, now=Fri Jun 28 12:04:33 CST 2013]

.......