基于JBoss开发EJB3 Message[消息驱动] Bean
环境:
JDK 1.6
jboss-4.2.3.GA-jdk6
>>1,配置Queue对象,在{JBOSS_HOME}\server\default\deploy里(或其子目录中,可以是多层子目录)创建一个文件名为xxx-service.xml文件，这里xxx可以任意正常字符串，这里取名为message-service.xml。
message-service.xml:
<?xml version="1.0" encoding="UTF-8"?>
<server>
<mbean code="org.jboss.mq.server.jmx.Queue" name="jboss.mq.destination:service=Queue,name=RdsGenerateQueue">
<attribute name="JNDIName">queue/rds/generateQueue</attribute>
<depends optional-attribute-name="DestinationManager">jboss.mq:service=DestinationManager</depends>
</mbean>
</server>
当在Jboss里部署成功后,就会出现如下信息:
14:59:30,211 INFO [RdsGenerateQueue] Bound to JNDI name: queue/rds/generateQueue
>>2,开发消息发送者.这里当然有两种方式,一种是通过普通的java类来发送消息,另一种是通过EJB Session Bean来发送消息(对于企业应用中,多数使用此方式).下面将进行一一介绍.
普通的java类来发送消息:
package com.jerval.ejb3.mdb;
import java.util.Properties;
import javax.jms.Destination;
import javax.jms.MessageProducer;
import javax.jms.ObjectMessage;
import javax.jms.Queue;
import javax.jms.QueueConnection;
import javax.jms.QueueConnectionFactory;
import javax.jms.QueueSession;
import javax.naming.InitialContext;
public class MainTest {
/**
* @param args
* @throws Exception
*/
public static void main(String[] args) throws Exception {
Properties properties = new Properties();
// java.naming.factory.initial为固定写法
// org.jnp.interfaces.NamingContextFactory 为jboss的链接工厂
properties.setProperty("java.naming.factory.initial",
"org.jnp.interfaces.NamingContextFactory");
// 用于设置命名服务器的链接URL
properties.setProperty("java.naming.provider.url", "localhost:1099");
InitialContext ctx = new InitialContext(properties);
QueueConnectionFactory factory = (QueueConnectionFactory) ctx
.lookup("ConnectionFactory");
QueueConnection connection = factory.createQueueConnection();
QueueSession session = connection.createQueueSession(false,
QueueSession.AUTO_ACKNOWLEDGE);
Destination destination = (Queue) ctx.lookup("queue/rds/generateQueue");
MessageProducer messageProducer = session.createProducer(destination);
ObjectMessage objectMessage = session.createObjectMessage();
objectMessage.setObject(new User(888, "jerval"));
messageProducer.send(objectMessage);
session.close();
connection.close();
}
}
User.java :
package com.jerval.ejb3.mdb;
import java.io.Serializable;
public class User implements Serializable{
/**
*
*/
private static final long serialVersionUID = -444431407185425444L;
private Integer userId;
private String userName;
public User() {
}
public User(Integer userId, String userName) {
super();
this.userId = userId;
this.userName = userName;
}
public Integer getUserId() {
return userId;
}
public void setUserId(Integer userId) {
this.userId = userId;
}
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
@Override
public String toString() {
return "User [userId=" + userId + ", userName=" + userName + "]";
}
}
通过EJB Session Bean来发送消息:
MessageSenderBean:
package com.jerval.ejb3.mdb;
import javax.annotation.Resource;
import javax.ejb.Local;
import javax.ejb.Remote;
import javax.ejb.Stateless;
import javax.jms.Connection;
import javax.jms.ConnectionFactory;
import javax.jms.MessageProducer;
import javax.jms.Queue;
import javax.jms.Session;
import javax.jms.TextMessage;
@Stateless
@Remote(MessageSenderService.class)
@Local(MessageSenderService.class)
public class MessageSenderBean implements MessageSenderService {
@Resource(mappedName = "ConnectionFactory")
private ConnectionFactory connectionFactory;
@Resource(mappedName = "queue/rds/generateQueue")
private Queue queue;
@Override
public void sendMessage(String guestName) throws Exception {
Connection connection = connectionFactory.createConnection();
Session session = connection.createSession(false,
Session.AUTO_ACKNOWLEDGE);
MessageProducer messageProducer = session.createProducer(queue);
TextMessage textMessage = session.createTextMessage("Hello "
+ guestName + ",I am jerval !");
messageProducer.send(textMessage);
connection.close();
}
}
MessageSenderService:
package com.jerval.ejb3.mdb;
public interface MessageSenderService {
void sendMessage(String guestName) throws Exception;
}
Invode Sender Service :
package com.jerval.ejb3.mdb;
import java.util.Properties;
import javax.naming.InitialContext;
public class Test {
/**
* @param args
* @throws Exception
*/
public static void main(String[] args) throws Exception {
Properties properties = new Properties();
//java.naming.factory.initial为固定写法
//org.jnp.interfaces.NamingContextFactory 为jboss的链接工厂
properties.setProperty("java.naming.factory.initial","org.jnp.interfaces.NamingContextFactory");
//用于设置命名服务器的链接URL
properties.setProperty("java.naming.provider.url", "localhost:1099");
InitialContext ctx = new InitialContext(properties);
MessageSenderService messageSenderService = (MessageSenderService) ctx.lookup("MessageSenderBean/remote");
messageSenderService.sendMessage("World");
}
}
>>3,开发EJB3 Message[消息驱动] Bean,即消息接受者.首先将{JBOSS_HOME}\client里的所有jar放到项目的classpath . 然后创建一个名为RdsGenerateMDB的java文件,文件内容如下:
RdsGenerateMDB.java
package com.jerval.ejb3.mdb;
import javax.ejb.ActivationConfigProperty;
import javax.ejb.MessageDriven;
import javax.jms.Message;
import javax.jms.MessageListener;
import javax.jms.ObjectMessage;
import javax.jms.TextMessage;
@MessageDriven(activationConfig = {
@ActivationConfigProperty(propertyName = "destinationType", propertyValue = "javax.jms.Queue"),
@ActivationConfigProperty(propertyName = "destination", propertyValue = "queue/rds/generateQueue") })
public class RdsGenerateMDB implements MessageListener {
@Override
public void onMessage(Message message) {
try {
if (message instanceof ObjectMessage) {
ObjectMessage objectMessage = (ObjectMessage) message;
User user = (User) objectMessage.getObject();
System.out.println("User Info : " + user);
} else if (message instanceof TextMessage) {
TextMessage textMessage = (TextMessage) message;
System.out.println("Text Info : " + textMessage.getText());
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
当分别调用这两种方法后,后台将出现如下信息:
16:26:38,032 INFO [STDOUT] User Info : User [userId=888, userName=jerval]
16:26:55,954 INFO [STDOUT] Text Info : Hello World,I am jerval !