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使用WEBLOGIC收发JMS

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  • Java
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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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