如何在java（JRE/JDK/J2EE 1.4）中实例化仅接收与给定JMSCorrelationID匹配的消息的JMS队列侦听器？ 我要接收的消息已发布到队列而不是主题，尽管如果需要，可以更改。
以下是我当前用于将消息放入队列的代码：/**
* publishResponseToQueue publishes Requests to the Queue.
*
* @param jmsQueueFactory -Name of the queue-connection-factory
* @param jmsQueue -The queue name for the request
* @param response -A response object that needs to be published
*
* @throws ServiceLocatorException -An exception if a request message
* could not be published to the Topic
*/
private void publishResponseToQueue( String jmsQueueFactory,
String jmsQueue,
Response response )
throws ServiceLocatorException {
if ( logger.isInfoEnabled() ) {
logger.info( "Begin publishRequestToQueue: " +
jmsQueueFactory + "," + jmsQueue + "," + response );
}
logger.assertLog( jmsQueue != null && !jmsQueue.equals(""),
"jmsQueue cannot be null" );
logger.assertLog( jmsQueueFactory != null && !jmsQueueFactory.equals(""),
"jmsQueueFactory cannot be null" );
logger.assertLog( response != null, "Request cannot be null" );
try {
Queue queue = (Queue)_context.lookup( jmsQueue );
QueueConnectionFactory factory = (QueueConnectionFactory)
_context.lookup( jmsQueueFactory );
QueueConnection connection = factory.createQueueConnection();
connection.start();
QueueSession session = connection.createQueueSession( false,
QueueSession.AUTO_ACKNOWLEDGE );
ObjectMessage objectMessage = session.createObjectMessage();
objectMessage.setJMSCorrelationID(response.getID());
objectMessage.setObject( response );
session.createSender( queue ).send( objectMessage );
session.close();
connection.close();
} catch ( Exception e ) {
//XC3.2 Added/Modified BEGIN
logger.error( "ServiceLocator.publishResponseToQueue - Could not publish the " +
"Response to the Queue - " + e.getMessage() );
throw new ServiceLocatorException( "ServiceLocator.publishResponseToQueue " +
"- Could not publish the " +
"Response to the Queue - " + e.getMessage() );
//XC3.2 Added/Modified END
}
if ( logger.isInfoEnabled() ) {
logger.info( "End publishResponseToQueue: " +
jmsQueueFactory + "," + jmsQueue + response );
}
} // end of publishResponseToQueue method
队列连接设置是相同的，但是一旦您拥有了 QueueSession，就可以在创建接收器时设置选择器。
QueueReceiver receiver = session.createReceiver(myQueue, "JMSCorrelationID='theid'");
然后
receiver.receive()
或
receiver.setListener(myListener);
顺便说一句，
虽然这不是您提出的实际问题 - 如果您尝试通过 JMS 实现请求响应，我建议您阅读本文，因为 JMS API 比您想象的要复杂得多，并且有效地执行此操作比看起来要困难得多。
特别是为了有效地使用 JMS，您应该尽量避免为单个消息等创建消费者。
另外，由于JMS API非常复杂，无法正确有效地使用，特别是在池化，事务和并发处理方面，我建议人们从他们的应用程序代码中隐藏中间件，例如通过使用Apache Camel的JMS的Spring Remoting实现。
希望这会有所帮助。我使用了 Open MQ。
package com.MQueues;
import java.util.UUID;
import javax.jms.JMSException;
import javax.jms.MessageProducer;
import javax.jms.QueueConnection;
import javax.jms.QueueReceiver;
import javax.jms.QueueSession;
import javax.jms.Session;
import javax.jms.TextMessage;
import com.sun.messaging.BasicQueue;
import com.sun.messaging.QueueConnectionFactory;
public class HelloProducerConsumer {
public static String queueName = "queue0";
public static String correlationId;
public static String getCorrelationId() {
return correlationId;
}
public static void setCorrelationId(String correlationId) {
HelloProducerConsumer.correlationId = correlationId;
}
public static String getQueueName() {
return queueName;
}
public static void sendMessage(String threadName) {
correlationId = UUID.randomUUID().toString();
try {
// Start connection
QueueConnectionFactory cf = new QueueConnectionFactory();
QueueConnection connection = cf.createQueueConnection();
QueueSession session = connection.createQueueSession(false, Session.AUTO_ACKNOWLEDGE);
BasicQueue destination = (BasicQueue) session.createQueue(threadName);
MessageProducer producer = session.createProducer(destination);
connection.start();
// create message to send
TextMessage message = session.createTextMessage();
message.setJMSCorrelationID(correlationId);
message.setText(threadName + "(" + System.currentTimeMillis()
+ ") " + correlationId +" from Producer");
System.out.println(correlationId +" Send from Producer");
producer.send(message);
// close everything
producer.close();
session.close();
connection.close();
} catch (JMSException ex) {
System.out.println("Error = " + ex.getMessage());
}
}
public static void receivemessage(final String correlationId) {
try {
QueueConnectionFactory cf = new QueueConnectionFactory();
QueueConnection connection = cf.createQueueConnection();
QueueSession session = connection.createQueueSession(false, Session.AUTO_ACKNOWLEDGE);
BasicQueue destination = (BasicQueue) session.createQueue(getQueueName());
connection.start();
System.out.println("n");
System.out.println("Start listen " + getQueueName() + " " + correlationId +" Queue from receivemessage");
long now = System.currentTimeMillis();
// receive our message
String filter = "JMSCorrelationID = '" + correlationId + "'";
QueueReceiver receiver = session.createReceiver(destination, filter);
TextMessage m = (TextMessage) receiver.receive();
System.out.println("Received message = " + m.getText() + " timestamp=" + m.getJMSTimestamp());
System.out.println("End listen " + getQueueName() + " " + correlationId +" Queue from receivemessage");
session.close();
connection.close();
} catch (JMSException ex) {
System.out.println("Error = " + ex.getMessage());
}
}
public static void main(String args[]) {
HelloProducerConsumer.sendMessage(getQueueName());
String correlationId1 = getCorrelationId();
HelloProducerConsumer.sendMessage(getQueueName());
String correlationId2 = getCorrelationId();
HelloProducerConsumer.sendMessage(getQueueName());
String correlationId3 = getCorrelationId();
HelloProducerConsumer.receivemessage(correlationId2);
HelloProducerConsumer.receivemessage(correlationId1);
HelloProducerConsumer.receivemessage(correlationId3);
}
}
String filter = "JMSCorrelationID = '" + msg.getJMSMessageID() + "'";
QueueReceiver receiver = session.createReceiver(queue, filter);
在这里，接收方将获得JMSCorrelationID等于 MessageID 的消息。 这在请求/响应范式中非常有帮助。
或者您可以直接将其设置为任何值：
QueueReceiver receiver = session.createReceiver(queue, "JMSCorrelationID ='"+id+"'";);
你可以做receiver.receive(2000);或receiver.setMessageListener(this);