JMS发送和接受

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();    }  }}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 BeanMDB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。