jms是大家在项目中经常用到的技术,而activemq又是开源的jms产品中比较优秀的。在应用JMS处理相关业务时,大家都是构造消息,然后发送到队列,最后用message监听器监听到消息,对消息进行分析处理。在这个过程中,有两步是比较麻烦和重复的,那就是构造消息和拆解消息。并且这样与面向对象的思想很是违背。如果这样做显然是面向消息数据的,而不是面向对象的。基于以上原因,我向大家介绍一个我在项目中经过实践的开源框架:lingo.
lingo在JMS中起的主要作用就是对消息的封装,它让你可以不必关心消息的构造和拆解,而只需关心你本身的业务逻辑。我将举一个例子,分别用activemq直接实现和用lingo实现。在这个例子中我用到了spring framework. =================================Hello.java=========================== import java.io.Serializable; /**Hello.java用来传递JAVA对象 * Author: cjp * Date: 2005-11-8 * Time: 22:24:02 */ public class Hello implements Serializable { private String id; private Hello hello; private PointList pointList; public String getId() { return id; } public void setId(String id) { this.id = id; } public Hello getHello() { return hello; } public void setHello(Hello hello) { this.hello = hello; } } =========================SpringTest .java======================== import org.springframework.jms.core.JmsTemplate; import org.springframework.jms.core.MessageCreator; import org.springframework.test.AbstractDependencyInjectionSpringContextTests; import javax.jms.*; /** *发送JMS消息 */ public class SpringTest extends AbstractDependencyInjectionSpringContextTests { protected String[] getConfigLocations() { return new String[]{"file:D:\\wosame\\test\\com\\wosame\\room\\jms\\jms.xml"}; } public void testSendMessage() throws Exception { JmsTemplate jmsTemplate = (JmsTemplate) applicationContext.getBean("jmsTemplate"); jmsTemplate.send(new MessageCreator() { public Message createMessage(Session session) throws JMSException { ObjectMessage message=session.createObjectMessage(); Hello hello=new Hello(); hello.setId("test"); message.setObject(hello); return message; } }); } } ================================HelloMDP .java================================== /** 处理JMS消息 */ import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import javax.jms.*; public class HelloMDP implements MessageListener { protected Log log = LogFactory.getLog(HelloMDP.class); public void onMessage(Message message) { try { ObjectMessage objMessage = (ObjectMessage) message; Hello hello= (Hello) objMessage.getObject(); System.out.println("hello.getId() = " + hello.getId()); } catch (JMSException e) { log.error("Parse failed", e); } } } ================================jms.xml================================== <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www./dtd/spring-beans.dtd"> <beans> <!--嵌入式的JMS连接,也就是跟随JVM一起启动,可以参看activemq的文档--> <bean id="connectionFactory" class="org.activemq.ActiveMQConnectionFactory"> <property name="brokerURL" value="vm://localhost"/> <property name="useEmbeddedBroker" value="true"/> </bean> <!--消息监听器,也就是消息的具体的处理器--> <bean id="HelloMDP" class="HelloMDP"/> <!--jms监听需要JTA容器的支持--> <bean id="activeMQContainer" class="org.activemq.jca.JCAContainer"> <property name="workManager"> <bean id="workManager" class="org.activemq.work.SpringWorkManager"/> </property> <property name="resourceAdapter"> <bean id="activeMQResourceAdapter" class="org.activemq.ra.ActiveMQResourceAdapter"> <property name="serverUrl" value="vm://localhost"/> </bean> </property> </bean> <!--消息的消费者,也就是将监听器与具体的队列关联--> <bean id="HelloQueueConsumer" factory-method="addConnector" factory-bean="activeMQContainer"> <property name="activationSpec"> <bean class="org.activemq.ra.ActiveMQActivationSpec"> <property name="destination" value="Hello.Queue"/> <property name="destinationType" value="javax.jms.Queue"/> </bean> </property> <property name="ref" value="HelloMDP"/> </bean> <!--spring的JMS template,用来发送JMS消息到指定的队列--> <bean id="jmsTemplate" class="org.springframework.jms.core.JmsTemplate"> <property name="defaultDestinationName" value="Hello.Queue"/> <property name="connectionFactory" ref="connectionFactory"/> </bean> </beans> |
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来自: jianjun0921 > 《jms》