studentmdbbean.java

想学习EJB的同学

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package ejb3.day5;

import java.text.SimpleDateFormat;
import javax.jms.Queue;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.annotation.Resource;
import javax.ejb.ActivationConfigProperty;
import javax.ejb.MessageDriven;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageListener;
import javax.jms.ObjectMessage;
import javax.jms.QueueConnection;
import javax.jms.QueueConnectionFactory;
import javax.jms.QueueSender;
import javax.jms.QueueSession;

/**
 *
 * @author user
 */
@MessageDriven(mappedName = "jms/t", activationConfig =  {
        @ActivationConfigProperty(propertyName = "acknowledgeMode", propertyValue = "Auto-acknowledge"),
        @ActivationConfigProperty(propertyName = "destinationType", propertyValue = "javax.jms.Topic"),
        @ActivationConfigProperty(propertyName = "subscriptionDurability", propertyValue = "Durable"),
        @ActivationConfigProperty(propertyName = "clientId", propertyValue = "StudentMDBBean"),
        @ActivationConfigProperty(propertyName = "subscriptionName", propertyValue = "StudentMDBBean")
    })
public class StudentMDBBean implements MessageListener {
    @Resource(mappedName="jms/qcf") 
    private QueueConnectionFactory qcf;
    @Resource(mappedName="jms/q")
    private Queue q;
    
    
    public StudentMDBBean() {
    }

    public void onMessage(Message message) {
        try {
            ObjectMessage om = (ObjectMessage) message;
            Student stu = (Student) om.getObject();
            sendToQueue(stu);
        } catch (JMSException ex) {
            Logger.getLogger(StudentMDBBean.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

    private void sendToQueue(Student stu) {
        StringBuilder sb = new StringBuilder();
        sb.append(stu.getName()).append(",")
          .append(stu.getSex()).append(",");
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        sb.append(sdf.format(stu.getBirthday()));
        
        QueueConnection con = null;
        QueueSession ses = null;
        QueueSender sender = null;
        
        try{
            con = qcf.createQueueConnection();
            ses = con.createQueueSession(true, QueueSession.AUTO_ACKNOWLEDGE);
            sender = ses.createSender(q);
            sender.send(ses.createTextMessage(sb.toString()));
        }catch(JMSException e){
            e.printStackTrace();
        }finally{
            if(sender != null) try{ sender.close(); } catch(JMSException e){}
            if(ses != null) try{ ses.close(); } catch(JMSException e){}
            if(con != null) try{ con.close(); } catch(JMSException e){}
        }
    }
    
}