使用WEBLOGIC收发JMS
JMS是一个由AS提供的Message服务。它能接受消息产生者(Message Provider)所发出的消息，并把消息转发给消息消费者(Message Consumer)。2、JMS提供2种类型的消息服务：(1)Queue，即点对点，每个消息只转发给一个消息消费者使用。(2)Topic，即发布和订阅，每个消息可以转发给所有的订阅者(消费者)。
3、WEBLOGIC 8下的JMS配置：
(1)配置JMS Connection Factory
(2)配置JMS File Store(目前所找到的文档都是配置File Store,其实在具体的应用中，可能JMS JDBC Store更广泛，但暂时没有找到资料)
(3)配置JMS Server
(4)在JMS Server的destinations中配置JMS Queue或者JMS Topic
其中提供给消息产生者和消息消费者使用的是JMS Connection Factory的JNDI和JMS Queue或者JMS Topic的JNDI。
4、消息产生者向JMS发送消息的步骤：
(1)使用JNDI查询对象JMS ConnectionFactory和Destination(JMS Queue/Topic)
(2)使用管理对象JMS ConnectionFactory建立连接Connection
(3)使用连接Connection 建立会话Session
(4)使用会话Session和管理对象Destination创建消息生产者MessageSender
(5)使用消息生产者MessageSender发送消息
一个消息发送者的例子：
package myjms;
import java.util.*;
import javax.naming.*;
import javax.jms.*;
public class MessageProducter {
public static void main(String[] args) {
String queueConnectionFactoryName = "myjmsconnectionfactory"; //JMS Connection Factory?JNDI
String queueName = "myjmsqueue"; //JMS Queue??JMS Topic?JNDI
boolean transacted = false;//transaction??
int acknowledgementMode = Session.AUTO_ACKNOWLEDGE;//acknowledgement??
String message="Message need to send";//?????????
Properties properties = new Properties();
properties.put(Context.INITIAL_CONTEXT_FACTORY,"weblogic.jndi.WLInitialContextFactory");
properties.put(Context.PROVIDER_URL, "t3://localhost:7001");
try {
Context context = new InitialContext(properties);
Object obj = context.lookup(queueConnectionFactoryName);
QueueConnectionFactory queueConnectionFactory = (QueueConnectionFactory) obj;//JMS Connection Factory???
obj = context.lookup(queueName);
Queue queue = (Queue) obj;//JMS Queue??JMS Topic???
QueueConnection queueConnection=queueConnectionFactory.createQueueConnection();//????
queueConnection.start();
QueueSession queueSession = queueConnection.createQueueSession(transacted, acknowledgementMode);
TextMessage textMessage = queueSession.createTextMessage();
textMessage.clearBody();
textMessage.setText(message);
QueueSender queueSender = queueSession.createSender(queue);
queueSender.send(textMessage);
if (transacted) {
queueSession.commit();
}
if (queueSender != null) {
queueSender.close();
}
if (queueSession != null) {
queueSession.close();
}
if (queueConnection != null) {
queueConnection.close();
}
}
catch(Exception ex){
ex.printStackTrace();
}
}
}
5、消息消费者从JMS接受消息的步骤：
(1)使用JNDI查询对象JMS ConnectionFactory和Destination(JMS Queue/Topic)
(2)使用管理对象JMS ConnectionFactory建立连接Connection
(3)使用连接Connection 建立会话Session
(4)使用会话Session和管理对象Destination创建消息消费者MessageReceiver
(5)使用消息消费者MessageReceiver接受消息，需要用setMessageListener将MessageListener接口绑定到MessageReceiver
消息消费者必须实现了MessageListener接口，需要定义onMessage事件方法。
一个消息消费者的例子：
package myjms;
import java.util.*;
import javax.naming.*;
import javax.jms.*;
public class MessageReciever
implements MessageListener {
public void onMessage(Message message) {
if (message instanceof TextMessage) {
TextMessage textMessage = (TextMessage) message;
try {
System.out.println("Message content is:" + textMessage.getText());
}
catch (JMSException e) {
e.printStackTrace();
}
}
}
public static void main(String[] args) {
MessageReciever msgRcvr=new MessageReciever();
String queueConnectionFactoryName = "myjmsconnectionfactory";
String queueName = "myjmsqueue";
boolean transacted = false;
int acknowledgementMode = Session.AUTO_ACKNOWLEDGE;
Properties properties = new Properties();
properties.put(Context.INITIAL_CONTEXT_FACTORY,
"weblogic.jndi.WLInitialContextFactory");
properties.put(Context.PROVIDER_URL, "t3://localhost:7001");
try {
Context context = new InitialContext(properties);
Object obj = context.lookup(queueConnectionFactoryName);
QueueConnectionFactory queueConnectionFactory = (QueueConnectionFactory)
obj;
obj = context.lookup(queueName);
Queue queue = (Queue) obj;
QueueConnection queueConnection = queueConnectionFactory.
createQueueConnection();
queueConnection.start();
QueueSession queueSession = queueConnection.createQueueSession(transacted,
acknowledgementMode);
QueueReceiver queueReceiver = queueSession.createReceiver(queue);
queueReceiver.setMessageListener(msgRcvr);
synchronized(msgRcvr){
msgRcvr.wait(100000);
}
if (queueReceiver != null) {
queueReceiver.close();
}
if (queueSession != null) {
queueSession.close();
}
if (queueConnection != null) {
queueConnection.close();
}
}
catch (Exception ex) {
ex.printStackTrace();
}
}
}
6、Message-driven Bean
MDB实际上就是一个消息消费者的客户端程序。它由AS EJB Container来管理。在JBUILDER生成一个MDB非常简单。
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