從頭到尾講解EJB MDB（訊息驅動bean）四——範例程式碼

1、Queue：

用戶端：

public class MyMDBBeanClient {public static void main(String[] args) throws Exception {InitialContext ict = new InitialContext();//擷取connectionFactory對象QueueConnectionFactory factory = (QueueConnectionFactory)ict.lookup("ConnectionFactory");//擷取Connection對象QueueConnection connection = factory.createQueueConnection();//擷取Session對象，第一個參數表示事務自動認可，第二個參數表示一旦訊息被正確發送，將自動發迴響應QueueSession session = connection.createQueueSession(false, QueueSession.AUTO_ACKNOWLEDGE);//擷取destination對象Queue queue = (Queue)ict.lookup("queue/myqueue");//設定訊息TextMessage msg = session.createTextMessage("hello world ");//擷取sender對象QueueSender sender = session.createSender(queue);//發送訊息sender.send(msg);session.close();System.out.println("訊息已經發送！");}}

MDB：

public class MyMDBBeanClient {public static void main(String[] args) throws Exception {InitialContext ict = new InitialContext();//擷取connectionFactory對象QueueConnectionFactory factory = (QueueConnectionFactory)ict.lookup("ConnectionFactory");//擷取Connection對象QueueConnection connection = factory.createQueueConnection();//擷取Session對象，第一個參數表示事務自動認可，第二個參數表示一旦訊息被正確發送，將自動發迴響應QueueSession session = connection.createQueueSession(false, QueueSession.AUTO_ACKNOWLEDGE);//擷取destination對象Queue queue = (Queue)ict.lookup("queue/myqueue");//設定訊息TextMessage msg = session.createTextMessage("hello world ");//擷取sender對象QueueSender sender = session.createSender(queue);//發送訊息sender.send(msg);session.close();System.out.println("訊息已經發送！");}}

2.Topic

用戶端：

public class MyTopicMDBBeanClient {public static void main(String[] args) throws Exception {InitialContext ict = new InitialContext();//擷取connectionFactory對象TopicConnectionFactory factory = (TopicConnectionFactory)ict.lookup("ConnectionFactory");//擷取Connection對象TopicConnection connection = factory.createTopicConnection();//擷取Session對象，第一個參數表示事務自動認可，第二個參數表示一旦訊息被正確發送，將自動發迴響應TopicSession session = connection.createTopicSession(false, TopicSession.AUTO_ACKNOWLEDGE);//擷取destination對象Topic topic = (Topic)ict.lookup("topic/mytopic");//設定訊息TextMessage msg = session.createTextMessage("hello world ");//擷取sender對象TopicPublisher publisher = session.createPublisher(topic);//發送訊息publisher.publish(msg);session.close();System.out.println("訊息已經發送！");}}

MDB1：

@MessageDriven (activationConfig = {@ActivationConfigProperty(propertyName="destinationType",propertyValue="javax.jms.Topic"),@ActivationConfigProperty(propertyName="destination",propertyValue="topic/mytopic")})public class MyTopicMDBBean1 implements MessageListener {public void onMessage(Message msg) {TextMessage message = (TextMessage)msg;try {System.out.println("MyTopicMDBBean1調用了："+ message.getText());} catch (JMSException e) {e.printStackTrace();}}}

MDB2：

@MessageDriven (activationConfig = {@ActivationConfigProperty(propertyName="destinationType",propertyValue="javax.jms.Topic"),@ActivationConfigProperty(propertyName="destination",propertyValue="topic/mytopic")})public class MyTopicMDBBean2 implements MessageListener {public void onMessage(Message msg) {TextMessage message = (TextMessage)msg;try {System.out.println("MyTopicMDBBean2調用了："+ message.getText());} catch (JMSException e) {e.printStackTrace();}}}

3、部署運行測試

將ejb mdb（queue、toppic）部署到jboss伺服器上，運行用戶端。

注意：如果是部署到jboss4.0版本上，不會有問題，但直接部署到jboss5.0版本上會報錯：javax.naming.NameNotFoundException:myqueue not bound

解決方案：

在JBoss根目錄\server\default\deploy 下的mail-service.xml檔案中加入如下：

<mbeancode="org.jboss.mq.server.jmx.Queue"name="jboss.org.destination:server=Queue,name=myqueue" >

　　<attributename="JNDIName" >queue/myqueue</attribute>

　　<dependsoptional-attribute-name = "DestinationManager" >jboss.mq:service=DestinationManager </depends>

</mbean>

topic找不到

 <mbean code="org.jboss.mq.server.jmx.Topic"name="jboss.org.destination:server=Topic,name=mytopic" >

    <!-- JNDI名稱 -->

    <attributename="JNDIName">topic/mytopic</attribute>

    <dependsoptional-attribute-name="DestinationManager">jboss.mq:service=DestinationManager</depends>

  </mbean>

重啟JBoss問題即解決。

當然，如果有其他的MDB，還需要繼續加入JNDIName。