Java中间件JMS(四)之ActiveMQ整合spring之类转换

原文链接：http://blog.csdn.net/dwc_fly/article/details/11096071

前几章都是直接发送MapMessage类型的数据,拿前面的例子来讲,如果生产者发送的是TextMessage，消费者也是必须TextMessage;如果我们自己要发送的数据不是TextMessage类型,而消费者还是TextMessage的，那该怎么办？难道每次接受后都要增加一个转换方法么？其实spring早就考虑到这种情况了。转化器在很多组件中都是必不缺少的东西Spring的MessageConverter接口提供了对消息转换的支持。

1、转换类的相关代码POJO

新建一个类MsgPoJo，就是一个简单的Pojo类。具体代码如下：

package jms.mq.spring;

import java.io.Serializable;

publicclass MsgPoJo implements Serializable{
private String id;
private String text;
public String getId() {
return id;
    }
publicvoid setId(String id) {
this.id = id;
    }
public String getText() {
return text;
    }
publicvoid setText(String text) {
this.text = text;
    }
}

2.转换类的实现

新建一个类MsgConverter.java，实现MessageConverter接口。生成的代码如下

package jms.mq.spring;

import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.Session;
import javax.jms.TextMessage;

import org.springframework.jms.support.converter.MessageConversionException;
import org.springframework.jms.support.converter.MessageConverter;

publicclass MsgConverter implements MessageConverter{

@Override
public Object fromMessage(Message message) throws JMSException,
    MessageConversionException {
if (!(message instanceof TextMessage)) {
thrownew MessageConversionException("Message is not TextMessage");
        }
        System.out.println("--转换接收的消息--");
        TextMessage textMessage = (TextMessage) message;
        MsgPoJo msgPojo = new MsgPoJo();
        String[] texts=textMessage.getText().split(",");
        msgPojo.setId(texts[0]);
        msgPojo.setText(texts[1]);
return msgPojo;
    }

@Override
public Message toMessage(Object object, Session session) throws JMSException,
    MessageConversionException {
if (!(object instanceof MsgPoJo)) {
thrownew MessageConversionException("obj is not MsgPojo");
        }
        System.out.println("--转换发送的消息--");
        MsgPoJo msgPojo = (MsgPoJo) object;
        TextMessage textMessage = session.createTextMessage();
        textMessage.setText(msgPojo.getId()+","+msgPojo.getText());
return  textMessage;
    }
}

代码很简单就是做些转换，有fromMessage和toMessage两个方法,真好对应发送转换toMessage和接受转换fromMessage。此时，发送和接收消息要换成template.convertAndSend(message)；template.receiveAndConvert()。接下来我做一些配置，让spring知道我们的转换类。修改applicationContext.xml中jms模版配置的代码，修改后的代码如下：

<!-- 类转换 -->
<beanid="msgConverter"class="jms.mq.spring.MsgConverter"></bean>

<!-- 配置Jms模板 -->
<beanid="jmsQueueTemplate"class="org.springframework.jms.core.JmsTemplate">
<propertyname="connectionFactory"ref="connectionFactory"/>
<propertyname="defaultDestination"ref="queueDest"/>
<!--<property name="receiveTimeout" value="10000" /> -->
<!-- 类转换 -->
<propertyname="messageConverter"ref="msgConverter"></property>
</bean>

注意:如果你有队列监听容器配置,配置jmsQueueTemplate和jmsTopicTemplate可能与队列容器配置冲突。

3、业务相关代码和配置

在QueueProducerService.java增加convertAndSend()方法并在其实现类中实现，实现类的代码如下：

package jms.mq.spring;

import java.util.Date;

import javax.jms.Destination;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.Session;
import javax.jms.TextMessage;
import org.springframework.jms.core.JmsTemplate;
import org.springframework.jms.core.MessageCreator;

publicclass QueueProducerService{
    JmsTemplate jmsTemplate;

    Destination destination;

publicvoid send() {
        MessageCreator messageCreator = new MessageCreator() {
public Message createMessage(Session session) throws JMSException {
                TextMessage message = session.createTextMessage();
                message.setText("QueueProducerService发送消息"+new Date());
return message;
            }

        };
        jmsTemplate.send(this.destination,messageCreator);
    }

publicvoid convertAndSend(){
        MsgPoJo msgPojo = new MsgPoJo();
        msgPojo.setId("1");
        msgPojo.setText("first msg");
        System.out.println("--发送消息：msgPojo.id为"+msgPojo.getId()+"；msgPojo.text为"+msgPojo.getText());
        jmsTemplate.convertAndSend(this.destination, msgPojo);
    }


publicvoid setJmsTemplate(JmsTemplate jmsTemplate) {
this.jmsTemplate = jmsTemplate;
    }

publicvoid setDestination(Destination destination) {
this.destination = destination;
    }
}

同样在QueueConsumerService.java中增加receiveAndConvert()方法并在其实现类中实现，实现类的代码如下：

package jms.mq.spring;

import javax.jms.Destination;
import javax.jms.JMSException;
import javax.jms.TextMessage;
import org.springframework.jms.core.JmsTemplate;


publicclass QueueConsumerService{

    JmsTemplate jmsTemplate;

    Destination destination;

publicvoid receive() {
        TextMessage message = (TextMessage) jmsTemplate.receive();
try {
            System.out.println("QueueConsumerService收到消息："+message.getText());

        } catch (JMSException e) {
            e.printStackTrace();
        }
    }

publicvoid receiveAndConvert() {
        MsgPoJo msgPojo = (MsgPoJo)jmsTemplate.receiveAndConvert();
if(msgPojo!=null){
            System.out.println("--收到消息：msgPojo.id为"+msgPojo.getId()+";msgPojo.text为"+msgPojo.getText());
        }
    }

publicvoid setJmsTemplate(JmsTemplate jmsTemplate) {
this.jmsTemplate = jmsTemplate;
    }

publicvoid setDestination(Destination destination) {
this.destination = destination;
    }
}

修改我们的两个测试类，增加对转换方法的调用，不再赘述，直接上代码：

QueueConsumerTest.java测试类

package jms.mq.spring;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

publicclass QueueConsumerTest {
privatestatic ApplicationContext appContext = new ClassPathXmlApplicationContext( "applicationContext.xml");

privatestaticvoid receive() {
        QueueConsumerService consumerService = (QueueConsumerService) appContext.getBean("queueConsumerService");
        consumerService.receive();
    }

privatestaticvoid receiveAndConvert() {
        QueueConsumerService consumerService = (QueueConsumerService) appContext.getBean("queueConsumerService");
        consumerService.receiveAndConvert();
    }


publicstaticvoid main(String[] args) {
//receive();
        receiveAndConvert();
    }
}

QueueProducerTest.java测试类

package jms.mq.spring;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

publicclass QueueProducerTest {
privatestatic ApplicationContext appContext = new ClassPathXmlApplicationContext( "applicationContext.xml");

privatestaticvoid send() {
        QueueProducerService producerService = (QueueProducerService) appContext.getBean("queueProducerService");
        producerService.send();
    }

privatestaticvoid convertAndSend() {
        QueueProducerService producerService = (QueueProducerService) appContext.getBean("queueProducerService");
        producerService.convertAndSend();
    }

publicstaticvoid main(String[] args) {
//send();
        convertAndSend();
    }

}

代码编写完毕，我们看一下我们的劳动成果。首先运行生产者类和消费者控制台信息如下：

收到的内容与发的内容相同，说明转换成功了。如果这一部分的程序使用的队列跟上面的一样，那你会发现发送的时候打印出的信息不值上面的一个，还包括一个接收的信息，这是为什么呢？了解spring原理的人应该知道，spring是把所有类都加载到内容中，当然也包括我们上门写的按个实现MessageListener的一个消费者类，他们也在运行，如果监听的地址跟你送的地址正好相同的话，他也有可能收到这个信息。所以在测试的时候要注意修改配置文件。

<beanid="queueProducerService"class="jms.mq.spring.QueueProducerService">
<propertyname="jmsTemplate"ref="jmsQueueTemplate"/>
<propertyname="destination"ref="queueDest"/>
</bean>

<beanid="queueConsumerService"class="jms.mq.spring.QueueConsumerService">
<propertyname="jmsTemplate"ref="jmsQueueTemplate"/>
<propertyname="destination"ref="queueDest"/>
</bean>

4、监听器上的使用方式

我再来学习一下跟监听器联合使用的方式，只在发布订阅者模式上演示一下。我们先来修改发布者的实现方式，在发布者中增加convertAndSend方法并在其实现类中实现,订阅者监听器没有类转换,不用修改，发布者修改后的代码如下：

package jms.mq.spring;

import java.util.Date;

import javax.jms.Destination;
import javax.jms.JMSException;
import javax.jms.MapMessage;
import javax.jms.Message;
import javax.jms.Session;
import javax.jms.TextMessage;

import org.springframework.jms.core.JmsTemplate;
import org.springframework.jms.core.MessageCreator;

import jms.spring.QueueProducerService;

publicclass TopicPublisherService{
    JmsTemplate jmsTemplate;

    Destination destination;

publicvoid send() {
        MessageCreator messageCreator = new MessageCreator() {

public Message createMessage(Session session) throws JMSException {
                TextMessage message = session.createTextMessage();
                message.setText("QueueProducerService发送消息"+new Date());
return message;
            }
        };
        jmsTemplate.send(this.destination,messageCreator);
    }

publicvoid convertAndSend(Object obj) {
        System.out.println("--发送PoJo对象...");
        jmsTemplate.convertAndSend(destination, obj);
    }


publicvoid setJmsTemplate(JmsTemplate jmsTemplate) {
this.jmsTemplate = jmsTemplate;
    }

publicvoid setDestination(Destination destination) {
this.destination = destination;
    }

}

发布订阅者配置文件如下

<!-- 配置TopicJms模板 -->
<beanid="jmsTopicTemplate"class="org.springframework.jms.core.JmsTemplate">
<propertyname="connectionFactory"ref="connectionFactory"/>
<propertyname="defaultDestination"ref="topicDest"/>
<!-- 配置是否为发布订阅者模式，默认为false -->
<propertyname="pubSubDomain"value="true"/>
<!--<property name="receiveTimeout" value="10000" /> -->
<propertyname="messageConverter"ref="msgConverter"></property>
</bean>

<beanid="topicPublisherService"class="jms.mq.spring.TopicPublisherService">
<propertyname="jmsTemplate"ref="jmsTopicTemplate"/>
<!-- <property name="destination" ref="topicDest" /> -->
<propertyname="destination"ref="topicSubscriberMessageListenerDest"/>
</bean>

<beanid="topicSubscriberService"class="jms.mq.spring.TopicSubscriberService">
<propertyname="jmsTemplate"ref="jmsTopicTemplate"/>
<propertyname="destination"ref="topicDest"/>
</bean>

修改上面的发布测试类，修改增加对新增方法的调用，修改后的内容如下：

package jms.mq.spring;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

publicclass TopicPublisherTest {
privatestatic ApplicationContext appContext = new ClassPathXmlApplicationContext( "applicationContext.xml");

privatestaticvoid send() {
        TopicPublisherService topicPublisherService = (TopicPublisherService) appContext.getBean("topicPublisherService");
        topicPublisherService.send();
    }
privatestaticvoid convertAndSend() {
        TopicPublisherService topicPublisherService = (TopicPublisherService) appContext.getBean("topicPublisherService");
        MsgPoJo msgPoJo = new MsgPoJo();
        msgPoJo.setId("1");
        msgPoJo.setText("测试内容");
        topicPublisherService.convertAndSend(msgPoJo);
    }


publicstaticvoid main(String[] args) {
//send();
        convertAndSend();
    }
}

运行发布测试类,运行结果如下：

写在到这里,ActiveMQ与spring整合就讲完了，主要讲了ActiveMQ与spring的简单整合,监听器和类转换这些主要功能.