Spring+ActiveMQ实现消息收发和订阅

1、去apach网站下载ActiveMQ，地址为http://activemq.apache.org/download.html；

      ActiveMQ类似tomcat可以独立启动，相当于开了消息服务，包括连接客户端管理、消息存储设置，对于复杂的系统还可以设置双机热备、负载均衡等；

     ActiveMQ有个管理界面，可以查看客户端连接情况，消息队列的发送和接收情况等，也可以直接新建消息；

    启动bin/activemq.bat即可启动ActiveMQ服务；

    conf/activemq.xml是配置文件，可以配置相关性能参数，消息存储形式和大小等；

2、MQ的spring配置

ActimveMQ的spring配置文件如下：

<bean id="connectionFactory" class="org.apache.activemq.ActiveMQConnectionFactory"><!-- property name="brokerURL" value="tcp://127.0.0.1:61616" / --><property name="brokerURL" value="failover://(tcp://127.0.0.1:61616)?initialReconnectDelay=100" /> <property name="useAsyncSend" value="true" /><property name="maxThreadPoolSize" value="50" /></bean><!-- <bean id="pooledConnectionFactory" class="org.apache.activemq.pool.PooledConnectionFactory"><property name="connectionFactory" ref="connectionFactory" /></bean> --><bean id="singleConnectionFactory" class="org.springframework.jms.connection.SingleConnectionFactory"><property name="targetConnectionFactory"><ref local="connectionFactory" /></property></bean><bean id="destinationQueue" class="org.apache.activemq.command.ActiveMQQueue">  <!-- 设置消息队列的名字 -->        <constructor-arg index="0" value="myqueue0"/>   </bean>   <!-- 发送消息的目的地（一个队列） -->    <bean id="vehPassTopic" class="org.apache.activemq.command.ActiveMQTopic">        <!-- 设置消息队列的名字 -->        <constructor-arg index="0" value="vehPass.messages" />    </bean>        <bean id="vehAlarmTopic" class="org.apache.activemq.command.ActiveMQTopic">        <!-- 设置消息队列的名字 -->        <constructor-arg index="0" value="vehAlarm.messages" />    </bean>        <bean id="jmsTemplate" class="org.springframework.jms.core.JmsTemplate"><!-- <property name="connectionFactory" ref="connectionFactory"/> --><property name="connectionFactory" ref="singleConnectionFactory" /><!-- <property name="defaultDestination" ref="destination"/> --><!-- 区别它采用的模式为false是p2p为true是订阅 -->        <!-- <property name="pubSubDomain" value="true" /> --></bean>

注意这行很关键

<property name="brokerURL" value="failover://(tcp://127.0.0.1:61616)?initialReconnectDelay=100" /> 

是为了保证断线自动重连；如果没有设置，程序与ActiveMQ服务连接后期间出现过网络异常，再程序无法与ActiveMQ正常通讯；

3、测试程序

发送消息程序：

public class MessageSender{protected Logger log = Logger.getLogger(MessageReceiver.class.getName());private static JmsTemplate jmsTemplate = (JmsTemplate)MyApplicationContextUtil.context.getBean("jmsTemplate");private static Destination vehAlarmTopic = (Destination)MyApplicationContextUtil.context.getBean("vehAlarmTopic");private static Destination vehPassTopic = (Destination)MyApplicationContextUtil.context.getBean("vehPassTopic");static MyMessageCreator mc = null;/*  *  */public static boolean sendLiveMessage(Object msg){boolean isSend = false;mc = new MyMessageCreator(msg);jmsTemplate.send(vehPassTopic, mc);isSend = true;return isSend;}public static boolean sendBKMessage(Object msg){boolean isSend = false;MyMessageCreator mc = new MyMessageCreator(msg);jmsTemplate.send(vehAlarmTopic, mc);isSend = true;return isSend;}public static void main(String args[]) throws Exception {ApplicationContext context = new ClassPathXmlApplicationContext(                new String[] { "applicationContext-mq.xml" });        JmsTemplate jmsTemplate = (JmsTemplate) context.getBean("jmsTemplate");        Destination destinationTopic = (Destination) context.getBean("destinationTopic");        for (int i = 1; i < 10; i++) {            MyMessageCreator mc = new MyMessageCreator("test");//生成消息            jmsTemplate.send(destinationTopic, mc);            Thread.sleep(1000);//1秒后发送下一条消息        }    }}

接收消息程序：

public class MessageReceiver {protected Logger log = Logger.getLogger(MessageReceiver.class.getName());private static JmsTemplate jmsTemplate = (JmsTemplate)MyApplicationContextUtil.context.getBean("jmsTemplate");private static Destination vehPassTopic = (Destination)MyApplicationContextUtil.context.getBean("vehPassTopic");/** *  * @return */public static List<Message> receiveMessage(){List<Message> msgList = null;Message message = null;                for (int i = 0; i < 100;) {//每次接收100条记录    message = jmsTemplate.receive(vehPassTopic);    if(message != null){    msgList.add(message);    /*if (message instanceof TextMessage) {     i++;     msg = (TextMessage)message;     returnMsg =  msg.getText();             log.debug("收到消息 :" + msg.getText());    }*/    }else{    break;    }        }return msgList;}public static void main(String args[]) throws Exception {ApplicationContext context = new ClassPathXmlApplicationContext(                new String[] { "applicationContext-mq.xml" });        JmsTemplate jmsTemplate = (JmsTemplate) context.getBean("jmsTemplate");        Destination destinationTopic = (Destination) context.getBean("destinationTopic");        TextMessage msg = null;        for (int i = 0; i < 10; i ++) {            msg = (TextMessage) jmsTemplate.receive(destinationTopic);            System.out.println("收到消息 :" + msg.getText());            Thread.sleep(1000);        }    }}

消息具体发送和接收情况都可在ActiveMQ的管理界面查看。

管理界面如下：访问地址：http://127.0.0.1:8161/admin/