接受JMS消息的Message Driven Bean(Weblogic)

接受JMS消息的Message Driven Bean(Weblogic)

一.WeblogicMDB类(Message Driven Bean)

import  javax.ejb.EJBException;
import  javax.ejb.MessageDrivenBean;
import  javax.ejb.MessageDrivenContext;
import  javax.jms.JMSException;
import  javax.jms.Message;
import  javax.jms.MessageListener;
import  javax.jms.TextMessage;
import  javax.naming.Context;
import  javax.naming.InitialContext;

public   class  WeblogicMDB  implements  MessageDrivenBean, MessageListener  {
    private static final long serialVersionUID = 5582665474886073061L;

    private MessageDrivenContext context;

    private Context jndiContext;

    public void setMessageDrivenContext(MessageDrivenContext context)
            throws EJBException {
        this.context = context;
        try {
            jndiContext = new InitialContext();
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }

    public void ejbCreate() {

    }

    public void ejbRemove() {

    }

    public void onMessage(Message message) {
        if (message instanceof TextMessage) {
            //System.out.println("Yeah! I have received the TextMassage:");
            TextMessage txtmsg = (TextMessage) message;

            try {
                System.out.println("I have received the TextMassage:");
                System.out.println(txtmsg.getText());
            } catch (JMSException e) {
                e.printStackTrace();
            }
        }
    }
}

二.ejb-jar.xml

<? xml version="1.0" ?>
<! DOCTYPE ejb-jar PUBLIC "-//Sun Microsystems, Inc.//DTD Enterprise JavaBeans 2.0//EN" "http://java.sun.com/j2ee/dtds/ejb-jar_2_0.dtd" >

< ejb-jar >

  < enterprise-beans >

   < message-driven >
      < ejb-name > WeblogicMDBName </ ejb-name >
      < ejb-class > WeblogicMDB </ ejb-class >
      < transaction-type > Container </ transaction-type >
      < message-driven-destination >
        < destination-type > javax.jms.Queue </ destination-type >
      </ message-driven-destination >
      < env-entry >
          < description > This is a bean listening on a queue. </ description >
          < env-entry-name > listen_type </ env-entry-name >
          < env-entry-type > java.lang.String </ env-entry-type >
          < env-entry-value > queue </ env-entry-value >
      </ env-entry >
    </ message-driven >
   </ enterprise-beans >
</ ejb-jar >

三.weblogic-ejb-jar.xml

<? xml version="1.0" ?>
<! DOCTYPE weblogic-ejb-jar PUBLIC '-//BEA Systems, Inc.//DTD WebLogic 8.1.0 EJB//EN' 'http://www.bea.com/servers/wls810/dtd/weblogic-ejb-jar.dtd' >

< weblogic-ejb-jar >

     < weblogic-enterprise-bean >
         < ejb-name > WeblogicMDBName </ ejb-name >
         < message-driven-descriptor >
             < pool >
                 < max-beans-in-free-pool > 10 </ max-beans-in-free-pool >
                 < initial-beans-in-free-pool >
                    2
                 </ initial-beans-in-free-pool >
             </ pool >
             < destination-jndi-name > MyJMSQueue </ destination-jndi-name >
             < initial-context-factory >
                weblogic.jndi.WLInitialContextFactory
             </ initial-context-factory >
             < provider-url > t3://127.0.0.1:7001/ </ provider-url >
             < connection-factory-jndi-name >
                MyJMSConnectionFactory
             </ connection-factory-jndi-name >
         </ message-driven-descriptor >
     </ weblogic-enterprise-bean >
</ weblogic-ejb-jar >

使用上一篇文章中的QueueSupplier发送消息,输出示例:


过程很简单,值得注意的是系统的JDK最好和Weblogic使用的保持一致,至少不能存在代差.例如
输出消息我曾经是这样写的:
System.out.println("I have received the TextMassage:"+txtmsg.getText());
系统中的JDK1.5使用StringBuilder来把两个字符串加在一起,而Weblogic自带的1.4不认识StringBuilder,就产生了异常.
而制定Weblogic8.1的JDK为系统中的JDK1.5又会导致错误. 所以,编程时建议JDK和Weblogic8.1的JDK保持一致,以避免发生莫明其妙的错误.


程序下载:
http://www.blogjava.net/Files/sitinspring/WeblogicMDB20070910131749.rar