在下面的例子中，分别发送一个Persistent和nonpersistent的消息，然后关闭退出JMS。

import javax.jms.Connection;

import javax.jms.DeliveryMode;

import javax.jms.MessageProducer;

import javax.jms.Queue;

import javax.jms.Session;

import org.apache.activemq.ActiveMQConnectionFactory;

import org.apache.activemq.command.ActiveMQQueue;

public class DeliveryModeSendTest {

public static void main(String[] args) throws Exception {

ActiveMQConnectionFactory factory = new ActiveMQConnectionFactory("vm://localhost");

Connection connection = factory.createConnection();

connection.start();

Queue queue = new ActiveMQQueue("testQueue");

Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);

MessageProducer producer = session.createProducer(queue);

producer.setDeliveryMode(DeliveryMode.PERSISTENT);

producer.send(session.createTextMessage("A persistent Message"));

producer.setDeliveryMode(DeliveryMode.NON_PERSISTENT);

producer.send(session.createTextMessage("A non persistent Message"));

System.out.println("Send messages sucessfully!");

}

}

运行上面的程序，当输出“Send messages sucessfully!”时，说明两个消息都已经发送成功，然后我们结束它，来停止JMS Provider。 接下来我们重新启动JMS Provicer，然后添加一个消费者：

import javax.jms.Connection;

import javax.jms.JMSException;

import javax.jms.Message;

import javax.jms.MessageConsumer;

import javax.jms.MessageListener;

import javax.jms.Queue;

import javax.jms.Session;

import javax.jms.TextMessage;

import org.apache.activemq.ActiveMQConnectionFactory;

import org.apache.activemq.command.ActiveMQQueue;

public class DeliveryModeReceiveTest {

public static void main(String[] args) throws Exception {

ActiveMQConnectionFactory factory = new ActiveMQConnectionFactory("vm://localhost");

Connection connection = factory.createConnection();

connection.start();

Queue queue = new ActiveMQQueue("testQueue");

Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);

MessageConsumer comsumer = session.createConsumer(queue);

comsumer.setMessageListener(new MessageListener(){

public void onMessage(Message m) {

try {

System.out.println("Consumer get " + ((TextMessage)m).getText());

} catch (JMSException e) {

e.printStackTrace();

}

}

});

}

}

运行上面的程序，可以得到下面的输出结果：

Consumer get A persistent Message

可以看出消息消费者只接收到一个消息，它是一个Persistent的消息。而刚才发送的non persistent消息已经丢失了。

另外, 如果发送一个non persistent消息, 而刚好这个时候没有消费者在监听, 这个消息也会丢失.