Message Driver Bean by queue or topic jms-优快云博客

本文介绍了一种使用Java消息服务（JMS）通过QueueMDB和TopicMDB处理消息的应用实例。QueueMDB用于直接接收消息并处理特定队列中的消息，而TopicMDB则订阅特定主题的消息，即使客户端离线也能确保消息传递。

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queue mdb

package com.test;

import javax.ejb.ActivationConfigProperty;
import javax.ejb.MessageDriven;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageListener;
import javax.jms.TextMessage;

@MessageDriven(mappedName = "jms/fileQueue", activationConfig = {
@ActivationConfigProperty(propertyName = "acknowledgeMode", propertyValue = "Auto-acknowledge"),
@ActivationConfigProperty(propertyName = "destinationType", propertyValue = "javax.jms.Queue")})
public class QueueMDB implements MessageListener {

public void onMessage(Message message) {
System.out.println("run ,i am a queue mdb ejb....");

if(message instanceof TextMessage){
TextMessage tm = (TextMessage) message ;
String user;
try {
user = tm.getStringProperty("user");
System.out.println(tm.getText() + ", user : "+user);
} catch (JMSException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

}

}

}

topic mdb

package com.test;

import javax.ejb.ActivationConfigProperty;
import javax.ejb.MessageDriven;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageListener;
import javax.jms.TextMessage;

@MessageDriven(mappedName = "jms/fileTopic", activationConfig = {
@ActivationConfigProperty(propertyName = "acknowledgeMode", propertyValue = "Auto-acknowledge"),
@ActivationConfigProperty(propertyName = "destinationType", propertyValue = "javax.jms.Topic"),
@ActivationConfigProperty(propertyName = "subscriptionDurability", propertyValue = "Durable"),
@ActivationConfigProperty(propertyName = "clientId", propertyValue = "TopicMDB"),
@ActivationConfigProperty(propertyName = "subscriptionName", propertyValue = "TopicMDB") })
public class TopicMDB implements MessageListener {

public void onMessage(Message message) {
System.out.println("run ,i am a topic mdb ejb....");

if(message instanceof TextMessage){
TextMessage tm = (TextMessage) message ;
String user;
try {
user = tm.getStringProperty("user");
System.out.println(tm.getText() + ", user : "+user);
} catch (JMSException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

}
}

}