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的JNDI
- String queueName = "myjmsqueue"; //JMS Queue或者JMS Topic的JNDI
- boolean transacted = false;//transaction模式
- int acknowledgementMode = Session.AUTO_ACKNOWLEDGE;//acknowledgement模式
- String message="Message need to send";//模拟需要发送的消息
- 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的获得
- obj = context.lookup(queueName);
- Queue queue = (Queue) obj;//JMS Queue或者JMS Topic的获得
- QueueConnection queueConnection=queueConnectionFactory.createQueueConnection();//产生连接
- 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();
- }
- }
- }
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的JNDI String queueName = "myjmsqueue"; //JMS Queue或者JMS Topic的JNDI boolean transacted = false;//transaction模式 int acknowledgementMode = Session.AUTO_ACKNOWLEDGE;//acknowledgement模式 String message="Message need to send";//模拟需要发送的消息 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的获得 obj = context.lookup(queueName); Queue queue = (Queue) obj;//JMS Queue或者JMS Topic的获得 QueueConnection queueConnection=queueConnectionFactory.createQueueConnection();//产生连接 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();
- }
- }
- }
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。