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.
