javamailmessagebean.java

一个java写的加密算法

/*
 * Copyright 2004-2005 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

package samples.connectors.mailconnector.ejb.mdb;

import java.io.Serializable;
import java.rmi.RemoteException;
import javax.ejb.EJBException;
import javax.ejb.MessageDrivenBean;
import javax.ejb.MessageDrivenContext;
import javax.ejb.CreateException;
import java.util.*;
import java.util.logging.*;
import java.text.*;
import javax.naming.*;
import javax.mail.*;
import javax.mail.Message;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;


import samples.connectors.mailconnector.api.*;

/**
 * A simple message-driven bean.
 * The code illustrates the requirements of a message-driven bean class:
 * <ul>
 * <li>It implements the <code>MessageDrivenBean</code> and 
 *     <code>JavaMailMessageListener</code> interfaces. 
 * <li>The class is defined as <code>public</code>. 
 * <li>The class cannot be defined as <code>abstract</code> or 
 *     <code>final</code>. 
 * <li>It implements one <code>onMessage</code> method. 
 * <li>It implements one <code>ejbCreate</code> method and one 
 *     <code>ejbRemove</code> method. 
 * <li>It contains a public constructor with no arguments. 
 * <li>It must not define the <code>finalize</code> method.  
 * </ul>
 *
 * Unlike session and entity beans, message-driven beans do not have the remote 
 * or local interfaces that define client access. Client components do not 
 * locate message-driven beans and invoke methods on them. Although 
 * message-driven beans do not have business methods, they may contain helper 
 * methods that are invoked internally by the onMessage method.
 *
 */

public class JavaMailMessageBean implements MessageDrivenBean, 
                                            JavaMailMessageListener 
{
    static final Logger logger = 
        Logger.getLogger("samples.connectors.mailconnector.ejb.mdb");

    private transient MessageDrivenContext mdc = null;
    private Context context;

    /**
     * Default constructor. Creates a bean.
     */

    public JavaMailMessageBean() {
        logger.info("<MDB> In JavaMailMessageBean.JavaMailMessageBean()");
    }

    /**
     * Sets the context for the bean.
     *
     * @param mdc the message-driven-bean context
     */

    public void setMessageDrivenContext(MessageDrivenContext mdc) 
    {
        logger.info("<MDB> In JavaMailMessageBean.setMessageDrivenContext()");
	this.mdc = mdc;
    }

    /**
     * Creates a bean. Required by EJB spec.
     */

    public void ejbCreate() 
    {
	logger.info("<MDB> In JavaMailMessageBean.ejbCreate()");
    }

    /**
     * When the inbox receives a message, the EJB container invokes the 
     * <code>onMessage</code> method of the message-driven bean. The
     * <code>onMessage</code> method displays information from the message 
     * headers, formulates a reply to the message, and sends it. (The code
     * to send the reply is currently commented out.)
     *
     * @param message incoming message
     */

    public void onMessage(javax.mail.Message message) 
    {
   	final String mailer = "JavaMailer";

        try 
	{
	    logger.info("<MDB> ---- Got a message ") ;
	    logger.info("<MDB> SUBJECT: " + message.getSubject() ) ;

	    context = new InitialContext();
	    Session session = 
	        (Session) context.lookup("java:comp/env/TheMailSession");
            
            Message reply = new MimeMessage(session);
            reply.setFrom();

	    Address[] addresses = message.getFrom();
	    if ((addresses != null) || (addresses.length < 1))
	    {
		addresses = message.getReplyTo();
	    }

            logger.info("<MDB> SENDER : " + addresses[0].toString());

            reply.setRecipients(Message.RecipientType.TO, addresses);
            reply.setSubject("MDB reply RE: " + message.getSubject());
  
            DateFormat dateFormatter = 
                DateFormat.getDateTimeInstance(DateFormat.LONG, 
                                               DateFormat.SHORT);
 
            Date timeStamp = new Date();
         
            String messageText = "Dear " + addresses[0].toString() + '\n' +
		"Thank you for your email." + '\n' +
             	"We received your message on " + 
             	dateFormatter.format(timeStamp) + ".";

            reply.setText(messageText);

            reply.setHeader("X-Mailer", mailer);
            reply.setSentDate(timeStamp);

	    // We used to reply to the sender, but this might
 	    // send undesired replies when testing with a busy
	    // mailbox. Uncomment the following line if you wish
	    // to do that.

            // Transport.send(reply);


      } catch(Exception e) {
            // logger.info("<MDB> Could not send the email: " + e.toString());
            throw new EJBException(e.getMessage());
      }
    }  // onMessage

    /**
     * Removes the bean. Required by EJB specification.
     */

    public void ejbRemove() 
    {
        logger.info("<MDB> In JavaMailMessageBean.remove()");
    }

} // class