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.springframework.org/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
