servlet/src/main/java/JavaMailServlet.java - jakartaee/mail-api - Git at Google

 /*
  * Copyright (c) 1998, 2018 Oracle and/or its affiliates. All rights reserved.
  *
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Distribution License v. 1.0, which is available at
  * http://www.eclipse.org/org/documents/edl-v10.php.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */

 import java.io.*;
 import java.util.*;
 import java.text.*;

 import javax.servlet.*;
 import javax.servlet.http.*;
 import javax.mail.*;
 import javax.mail.Part;
 import javax.mail.internet.*;
 import javax.activation.*;


 /**
  * This is a servlet that demonstrates the use of JavaMail APIs
  * in a 3-tier application. It allows the user to login to an
  * IMAP store, list all the messages in the INBOX folder, view
  * selected messages, compose and send a message, and logout.
  * <p>
  * Please note: This is NOT an example of how to write servlets!
  * This is simply to show that JavaMail can be used in a servlet.
  * <p>
  * For more information on this servlet, see the
  * JavaMailServlet.README.txt file.
  * <p>
  * For more information on servlets, see
  * <a href="http://java.sun.com/products/java-server/servlets/index.html">
  * http://java.sun.com/products/java-server/servlets/index.html</a>
  *
  * @author Max Spivak
  */
 public class JavaMailServlet extends HttpServlet implements SingleThreadModel {
     String protocol = "imap";
     String mbox = "INBOX";


     /**
      * This method handles the "POST" submission from two forms: the
      * login form and the message compose form. The login form has the
      * following parameters: <code>hostname</code>, <code>username</code>,
      * and <code>password</code>. The <code>send</code> parameter denotes
      * that the method is processing the compose form submission.
      */
     public  void doPost(HttpServletRequest req, HttpServletResponse res)
 	throws ServletException, IOException {

 	// get the session
 	HttpSession ssn = req.getSession(true);

 	String send = req.getParameter("send");
 	String host = req.getParameter("hostname");
 	String user = req.getParameter("username");
 	String passwd = req.getParameter("password");
 	URLName url = new URLName(protocol, host, -1, mbox, user, passwd);

 	ServletOutputStream out = res.getOutputStream();
 	res.setContentType("text/html");
 	out.println("<html><body bgcolor=\"#CCCCFF\">");

 	if (send != null) {
 	    // process message sending
 	    send(req, res, out, ssn);

 	} else {
 	    // initial login

 	    // create
 	    MailUserData mud = new MailUserData(url);
 	    ssn.putValue("javamailservlet", mud);

 	    try {
 		Properties props = System.getProperties();
 		props.put("mail.smtp.host", host);
 		Session session = Session.getDefaultInstance(props, null);
 		session.setDebug(false);
 		Store store = session.getStore(url);
 		store.connect();
 		Folder folder = store.getDefaultFolder();
 		if (folder == null)
 		    throw new MessagingException("No default folder");

 		folder = folder.getFolder(mbox);
 		if (folder == null)
 		    throw new MessagingException("Invalid folder");

 		folder.open(Folder.READ_WRITE);
 		int totalMessages = folder.getMessageCount();
 		Message[] msgs = folder.getMessages();
 		FetchProfile fp = new FetchProfile();
 		fp.add(FetchProfile.Item.ENVELOPE);
 		folder.fetch(msgs, fp);

 		// track who logged in
 		System.out.println("Login from: " + store.getURLName());

 		// save stuff into MUD
 		mud.setSession(session);
 		mud.setStore(store);
 		mud.setFolder(folder);

 		// splash
 		out.print("<center>");
 		out.print("<font face=\"Arial,Helvetica\" font size=+3>");
 		out.println("<b>Welcome to JavaMail!</b></font></center><p>");

 		// folder table
 		out.println("<table width=\"50%\" border=0 align=center>");
 		// folder name column header
 		out.print("<tr><td width=\"75%\" bgcolor=\"#ffffcc\">");
 		out.print("<font face=\"Arial,Helvetica\" font size=-1>");
 		out.println("<b>FolderName</b></font></td><br>");
 		// msg count column header
 		out.print("<td width=\"25%\" bgcolor=\"#ffffcc\">");
 		out.print("<font face=\"Arial,Helvetica\" font size=-1>");
 		out.println("<b>Messages</b></font></td><br>");
 		out.println("</tr>");
 		// folder name
 		out.print("<tr><td width=\"75%\" bgcolor=\"#ffffff\">");
 		out.print("<a href=\"" + HttpUtils.getRequestURL(req) + "\">" +
 			  "Inbox" + "</a></td><br>");
 		// msg count
 		out.println("<td width=\"25%\" bgcolor=\"#ffffff\">" +
 			    totalMessages + "</td>");
 		out.println("</tr>");
 		out.println("</table");
 	    } catch (Exception ex) {
 		out.println(ex.toString());
 	    } finally {
 		out.println("</body></html>");
 		out.close();
 	    }
 	}
     }


     /**
      * This method handles the GET requests for the client.
      */
     public void doGet (HttpServletRequest req, HttpServletResponse res)
 	throws ServletException, IOException {

 	HttpSession ses = req.getSession(false); // before we write to out
 	ServletOutputStream out = res.getOutputStream();
 	MailUserData mud = getMUD(ses);

 	if (mud == null) {
 	    res.setContentType("text/html");
 	    out.println("<html><body>Please Login (no session)</body></html>");
 	    out.close();
 	    return;
 	}

 	if (!mud.getStore().isConnected()) {
 	    res.setContentType("text/html");
 	    out.println("<html><body>Not Connected To Store</body></html>");
 	    out.close();
 	    return;
 	}


 	// mux that takes a GET request, based on parameters figures
 	// out what it should do, and routes it to the
 	// appropriate method

 	// get url parameters
 	String msgStr = req.getParameter("message");
 	String logout = req.getParameter("logout");
 	String compose = req.getParameter("compose");
 	String part = req.getParameter("part");
 	int msgNum = -1;
 	int partNum = -1;

 	// process url params
 	if (msgStr != null) {
 	    // operate on message "msgStr"
 	    msgNum = Integer.parseInt(msgStr);

 	    if (part == null) {
 		// display message "msgStr"
 		res.setContentType("text/html");
 		displayMessage(mud, req, out, msgNum);

 	    } else {
 		// display part "part" in message "msgStr"
 		partNum = Integer.parseInt(part);
 		displayPart(mud, msgNum, partNum, out, res);
 	    }

 	} else if (compose != null) {
 	    // display compose form
 	    compose(mud, res, out);

 	} else if (logout != null) {
 	    // process logout
 	    try {
 		mud.getFolder().close(false);
 		mud.getStore().close();
 		ses.invalidate();
 		out.println("<html><body>Logged out OK</body></html>");
 	    } catch (MessagingException mex) {
 		out.println(mex.toString());
 	    }

 	} else {
 	    // display headers
 	    displayHeaders(mud, req, out);
 	}
     }

     /* main method to display messages */
     private void displayMessage(MailUserData mud, HttpServletRequest req,
 				ServletOutputStream out, int msgNum)
 	throws IOException {

 	out.println("<html>");
 	out.println("<HEAD><TITLE>JavaMail Servlet</TITLE></HEAD>");
 	out.println("<BODY bgcolor=\"#ccccff\">");
 	out.print("<center><font face=\"Arial,Helvetica\" ");
 	out.println("font size=\"+3\"><b>");
 	out.println("Message " + (msgNum+1) + " in folder " +
 		    mud.getStore().getURLName() +
 		    "/INBOX</b></font></center><p>");

 	try {
 	    Message msg = mud.getFolder().getMessage(msgNum);

 	    // first, display this message's headers
 	    displayMessageHeaders(mud, msg, out);

 	    // and now, handle the content
 	    Object o = msg.getContent();

 	    //if (o instanceof String) {
 	    if (msg.isMimeType("text/plain")) {
 		out.println("<pre>");
 		out.println((String)o);
 		out.println("</pre>");
 	    //} else if (o instanceof Multipart){
 	    } else if (msg.isMimeType("multipart/*")) {
 		Multipart mp = (Multipart)o;
 		int cnt = mp.getCount();
 		for (int i = 0; i < cnt; i++) {
 		    displayPart(mud, msgNum, mp.getBodyPart(i), i, req, out);
 		}
 	    } else {
 		out.println(msg.getContentType());
 	    }

 	} catch (MessagingException mex) {
 	    out.println(mex.toString());
 	}

 	out.println("</BODY></html>");
 	out.close();
     }

     /**
      * This method displays a message part. <code>text/plain</code>
      * content parts are displayed inline. For all other parts,
      * a URL is generated and displayed; clicking on the URL
      * brings up the part in a separate page.
      */
     private void displayPart(MailUserData mud, int msgNum, Part part,
 			     int partNum, HttpServletRequest req,
 			     ServletOutputStream out)
 	throws IOException {

 	if (partNum != 0)
 	    out.println("<p><hr>");

 	try {

 	    String sct = part.getContentType();
 	    if (sct == null) {
 		out.println("invalid part");
 		return;
 	    }
 	    ContentType ct = new ContentType(sct);

 	    if (partNum != 0)
 		out.println("<b>Attachment Type:</b> " +
 			    ct.getBaseType() + "<br>");

 	    if (ct.match("text/plain")) {
 		// display text/plain inline
 		out.println("<pre>");
 		out.println((String)part.getContent());
 		out.println("</pre>");

 	    } else {
 		// generate a url for this part
 		String s;
 		if ((s = part.getFileName()) != null)
 		    out.println("<b>Filename:</b> " + s + "<br>");
 		s = null;
 		if ((s = part.getDescription()) != null)
 		    out.println("<b>Description:</b> " + s + "<br>");

 		out.println("<a href=\"" +
 			    HttpUtils.getRequestURL(req) +
 			    "?message=" +
 			    msgNum + "&part=" +
 			    partNum + "\">Display Attachment</a>");
 	    }
 	} catch (MessagingException mex) {
 	    out.println(mex.toString());
 	}
     }

     /**
      * This method gets the stream from for a given msg part and
      * pushes it out to the browser with the correct content type.
      * Used to display attachments and relies on the browser's
      * content handling capabilities.
      */
     private void displayPart(MailUserData mud, int msgNum,
 			     int partNum, ServletOutputStream out,
 			     HttpServletResponse res)
 	throws IOException {

 	Part part = null;

 	try {
 	    Message msg = mud.getFolder().getMessage(msgNum);

 	    Multipart mp = (Multipart)msg.getContent();
 	    part = mp.getBodyPart(partNum);

 	    String sct = part.getContentType();
 	    if (sct == null) {
 		out.println("invalid part");
 		return;
 	    }
 	    ContentType ct = new ContentType(sct);

 	    res.setContentType(ct.getBaseType());
 	    InputStream is = part.getInputStream();
 	    int i;
 	    while ((i = is.read()) != -1)
 		out.write(i);
 	    out.flush();
 	    out.close();
 	} catch (MessagingException mex) {
 	    out.println(mex.toString());
 	}
     }

     /**
      * This is a utility message that pretty-prints the message
      * headers for message that is being displayed.
      */
     private void displayMessageHeaders(MailUserData mud, Message msg,
 				       ServletOutputStream out)
 	throws IOException {

 	try {
 	    out.println("<b>Date:</b> " + msg.getSentDate() + "<br>");

 	    Address[] fr = msg.getFrom();
 	    if (fr != null) {
 		boolean tf = true;
 		out.print("<b>From:</b> ");
 		for (int i = 0; i < fr.length; i++) {
 		    out.print(((tf) ? " " : ", ") + getDisplayAddress(fr[i]));
 		    tf = false;
 		}
 		out.println("<br>");
 	    }

 	    Address[] to = msg.getRecipients(Message.RecipientType.TO);
 	    if (to != null) {
 		boolean tf = true;
 		out.print("<b>To:</b> ");
 		for (int i = 0; i < to.length; i++) {
 		    out.print(((tf) ? " " : ", ") + getDisplayAddress(to[i]));
 		    tf = false;
 		}
 		out.println("<br>");
 	    }

 	    Address[] cc = msg.getRecipients(Message.RecipientType.CC);
 	    if (cc != null) {
 		boolean cf = true;
 		out.print("<b>CC:</b> ");
 		for (int i = 0; i < cc.length; i++) {
 		    out.print(((cf) ? " " : ", ") + getDisplayAddress(cc[i]));
 		    cf = false;
 		}
 		out.println("<br>");
 	    }

 	    out.print("<b>Subject:</b> " +
 		      ((msg.getSubject() !=null) ? msg.getSubject() : "") +
 		      "<br>");

 	} catch (MessagingException mex) {
 	    out.println(msg.toString());
 	}
     }

     /**
      * This method displays the URL's for the available commands and the
      * INBOX headerlist
      */
     private void displayHeaders(MailUserData mud,
 				HttpServletRequest req,
 				ServletOutputStream out)
 	throws IOException {

 	SimpleDateFormat df = new SimpleDateFormat("EE M/d/yy");

 	out.println("<html>");
 	out.println("<HEAD><TITLE>JavaMail Servlet</TITLE></HEAD>");
 	out.println("<BODY bgcolor=\"#ccccff\"><hr>");
 	out.print("<center><font face=\"Arial,Helvetica\" font size=\"+3\">");
 	out.println("<b>Folder " + mud.getStore().getURLName() +
 		    "/INBOX</b></font></center><p>");

 	// URL's for the commands that are available
 	out.println("<font face=\"Arial,Helvetica\" font size=\"+3\"><b>");
 	out.println("<a href=\"" +
 		    HttpUtils.getRequestURL(req) +
 		    "?logout=true\">Logout</a>");
 	out.println("<a href=\"" +
 		    HttpUtils.getRequestURL(req) +
 		    "?compose=true\" target=\"compose\">Compose</a>");
 	out.println("</b></font>");
 	out.println("<hr>");

 	// List headers in a table
 	out.print("<table cellpadding=1 cellspacing=1 "); // table
 	out.println("width=\"100%\" border=1>");          // settings

 	// sender column header
 	out.println("<tr><td width=\"25%\" bgcolor=\"ffffcc\">");
 	out.println("<font face=\"Arial,Helvetica\" font size=\"+1\">");
 	out.println("<b>Sender</b></font></td>");
 	// date column header
 	out.println("<td width=\"15%\" bgcolor=\"ffffcc\">");
 	out.println("<font face=\"Arial,Helvetica\" font size=\"+1\">");
 	out.println("<b>Date</b></font></td>");
 	// subject column header
 	out.println("<td bgcolor=\"ffffcc\">");
 	out.println("<font face=\"Arial,Helvetica\" font size=\"+1\">");
 	out.println("<b>Subject</b></font></td></tr>");

 	try {
 	    Folder f = mud.getFolder();
 	    int msgCount = f.getMessageCount();
 	    Message m = null;
 	    // for each message, show its headers
 	    for (int i = 1; i <= msgCount; i++) {
 		m = f.getMessage(i);

 		// if message has the DELETED flag set, don't display it
 		if (m.isSet(Flags.Flag.DELETED))
 		    continue;

 		// from
 		out.println("<tr valigh=middle>");
 		out.print("<td width=\"25%\" bgcolor=\"ffffff\">");
 		out.println("<font face=\"Arial,Helvetica\">" +
 			    ((m.getFrom() != null) ?
 				       m.getFrom()[0].toString() :
 				       "" ) +
 			    "</font></td>");

 		// date
 		out.print("<td nowrap width=\"15%\" bgcolor=\"ffffff\">");
 		out.println("<font face=\"Arial,Helvetica\">" +
 			    df.format((m.getSentDate()!=null) ?
 				      m.getSentDate() : m.getReceivedDate()) +
 			    "</font></td>");

 		// subject & link
 		out.print("<td bgcolor=\"ffffff\">");
 		out.println("<font face=\"Arial,Helvetica\">" +
 			    "<a href=\"" +
 			    HttpUtils.getRequestURL(req) +
 			    "?message=" +
 			    i + "\">" +
 			    ((m.getSubject() != null) ?
 				   m.getSubject() :
 				   "<i>No Subject</i>") +
 			    "</a>" +
 			    "</font></td>");
 		out.println("</tr>");
 	    }
 	} catch (MessagingException mex) {
 	    out.println("<tr><td>" + mex.toString() + "</td></tr>");
 	    mex.printStackTrace();
 	}

 	out.println("</table>");
 	out.println("</BODY></html>");
 	out.flush();
 	out.close();
     }

     /**
      * This method handles the request when the user hits the
      * <i>Compose</i> link. It send the compose form to the browser.
      */
     private void compose(MailUserData mud, HttpServletResponse res,
 			 ServletOutputStream out)
 	throws IOException {

 	res.setContentType("text/html");
 	out.println(composeForm);
 	out.close();
     }

     /**
      * This method processes the send request from the compose form
      */
     private void send(HttpServletRequest req, HttpServletResponse res,
 		      ServletOutputStream out, HttpSession ssn)
 	throws IOException {

 	String to = req.getParameter("to");
 	String cc = req.getParameter("cc");
 	String subj = req.getParameter("subject");
 	String text = req.getParameter("text");

 	try {
 	    MailUserData mud = getMUD(ssn);
 	    if (mud == null)
 		throw new Exception("trying to send, but not logged in");

 	    Message msg = new MimeMessage(mud.getSession());
 	    InternetAddress[] toAddrs = null, ccAddrs = null;

 	    if (to != null) {
 		toAddrs = InternetAddress.parse(to, false);
 		msg.setRecipients(Message.RecipientType.TO, toAddrs);
 	    } else
 		throw new MessagingException("No \"To\" address specified");

 	    if (cc != null) {
 		ccAddrs = InternetAddress.parse(cc, false);
 		msg.setRecipients(Message.RecipientType.CC, ccAddrs);
 	    }

 	    if (subj != null)
 		msg.setSubject(subj);

 	    URLName u = mud.getURLName();
 	    msg.setFrom(new InternetAddress(u.getUsername() + "@" +
 					    u.getHost()));

 	    if (text != null)
 		msg.setText(text);

 	    Transport.send(msg);

 	    out.println("<h1>Message sent successfully</h1></body></html>");
 	    out.close();

 	} catch (Exception mex) {
 	    out.println("<h1>Error sending message.</h1>");
 	    out.println(mex.toString());
 	    out.println("<br></body></html>");
 	}
     }


     // utility method; returns a string suitable for msg header display
     private String getDisplayAddress(Address a) {
 	String pers = null;
 	String addr = null;
 	if (a instanceof InternetAddress &&
 	    ((pers = ((InternetAddress)a).getPersonal()) != null)) {

 	    addr = pers + "  "+"&lt;"+((InternetAddress)a).getAddress()+"&gt;";
 	} else
 	    addr = a.toString();

 	return addr;
     }

     // utility method; retrieve the MailUserData
     // from the HttpSession and return it
     private MailUserData getMUD(HttpSession ses) throws IOException {
 	MailUserData mud = null;

 	if (ses == null) {
 	    return null;
 	} else {
 	    if ((mud = (MailUserData)ses.getValue("javamailservlet")) == null){
 		return null;
 	    }
 	}
 	return mud;
     }


     public String getServletInfo() {
 	return "A mail reader servlet";
     }

     /**
      * This is the HTML code for the compose form. Another option would
      * have been to use a separate html page.
      */
     private static String composeForm = "<HTML><HEAD><TITLE>JavaMail Compose</TITLE></HEAD><BODY BGCOLOR=\"#CCCCFF\"><FORM ACTION=\"/servlet/JavaMailServlet\" METHOD=\"POST\"><input type=\"hidden\" name=\"send\" value=\"send\"><P ALIGN=\"CENTER\"><B><FONT SIZE=\"4\" FACE=\"Verdana, Arial, Helvetica\">JavaMail Compose Message</FONT></B><P><TABLE BORDER=\"0\" WIDTH=\"100%\"><TR><TD WIDTH=\"16%\" HEIGHT=\"22\">	<P ALIGN=\"RIGHT\"><B><FONT FACE=\"Verdana, Arial, Helvetica\">To:</FONT></B></TD><TD WIDTH=\"84%\" HEIGHT=\"22\"><INPUT TYPE=\"TEXT\" NAME=\"to\" SIZE=\"30\"> <FONT SIZE=\"1\" FACE=\"Verdana, Arial, Helvetica\"> (separate addresses with commas)</FONT></TD></TR><TR><TD WIDTH=\"16%\"><P ALIGN=\"RIGHT\"><B><FONT FACE=\"Verdana, Arial, Helvetica\">CC:</FONT></B></TD><TD WIDTH=\"84%\"><INPUT TYPE=\"TEXT\" NAME=\"cc\" SIZE=\"30\"> <FONT SIZE=\"1\" FACE=\"Verdana, Arial, Helvetica\"> (separate addresses with commas)</FONT></TD></TR><TR><TD WIDTH=\"16%\"><P ALIGN=\"RIGHT\"><B><FONT FACE=\"Verdana, Arial, Helvetica\">Subject:</FONT></B></TD><TD WIDTH=\"84%\"><INPUT TYPE=\"TEXT\" NAME=\"subject\" SIZE=\"55\"></TD></TR><TR><TD WIDTH=\"16%\">&nbsp;</TD><TD WIDTH=\"84%\"><TEXTAREA NAME=\"text\" ROWS=\"15\" COLS=\"53\"></TEXTAREA></TD></TR><TR><TD WIDTH=\"16%\" HEIGHT=\"32\">&nbsp;</TD><TD WIDTH=\"84%\" HEIGHT=\"32\"><INPUT TYPE=\"SUBMIT\" NAME=\"Send\" VALUE=\"Send\"><INPUT TYPE=\"RESET\" NAME=\"Reset\" VALUE=\"Reset\"></TD></TR></TABLE></FORM></BODY></HTML>";

 }


 /**
  * This class is used to store session data for each user's session. It
  * is stored in the HttpSession.
  */
 class MailUserData {
     URLName url;
     Session session;
     Store store;
     Folder folder;

     public MailUserData(URLName urlname) {
 	url = urlname;
     }

     public URLName getURLName() {
 	return url;
     }

     public Session getSession() {
 	return session;
     }

     public void setSession(Session s) {
 	session = s;
     }

     public Store getStore() {
 	return store;
     }

     public void setStore(Store s) {
 	store = s;
     }

     public Folder getFolder() {
 	return folder;
     }

     public void setFolder(Folder f) {
 	folder = f;
     }
 }
	/*
	* Copyright (c) 1998, 2018 Oracle and/or its affiliates. All rights reserved.
	*
	* This program and the accompanying materials are made available under the
	* terms of the Eclipse Distribution License v. 1.0, which is available at
	* http://www.eclipse.org/org/documents/edl-v10.php.
	*
	* SPDX-License-Identifier: BSD-3-Clause
	*/

	import java.io.*;
	import java.util.*;
	import java.text.*;

	import javax.servlet.*;
	import javax.servlet.http.*;
	import javax.mail.*;
	import javax.mail.Part;
	import javax.mail.internet.*;
	import javax.activation.*;


	/**
	* This is a servlet that demonstrates the use of JavaMail APIs
	* in a 3-tier application. It allows the user to login to an
	* IMAP store, list all the messages in the INBOX folder, view
	* selected messages, compose and send a message, and logout.
	* <p>
	* Please note: This is NOT an example of how to write servlets!
	* This is simply to show that JavaMail can be used in a servlet.
	* <p>
	* For more information on this servlet, see the
	* JavaMailServlet.README.txt file.
	* <p>
	* For more information on servlets, see
	* <a href="http://java.sun.com/products/java-server/servlets/index.html">
	* http://java.sun.com/products/java-server/servlets/index.html</a>
	*
	* @author Max Spivak
	*/
	public class JavaMailServlet extends HttpServlet implements SingleThreadModel {
	String protocol = "imap";
	String mbox = "INBOX";


	/**
	* This method handles the "POST" submission from two forms: the
	* login form and the message compose form. The login form has the
	* following parameters: <code>hostname</code>, <code>username</code>,
	* and <code>password</code>. The <code>send</code> parameter denotes
	* that the method is processing the compose form submission.
	*/
	public void doPost(HttpServletRequest req, HttpServletResponse res)
	throws ServletException, IOException {

	// get the session
	HttpSession ssn = req.getSession(true);

	String send = req.getParameter("send");
	String host = req.getParameter("hostname");
	String user = req.getParameter("username");
	String passwd = req.getParameter("password");
	URLName url = new URLName(protocol, host, -1, mbox, user, passwd);

	ServletOutputStream out = res.getOutputStream();
	res.setContentType("text/html");
	out.println("<html><body bgcolor=\"#CCCCFF\">");

	if (send != null) {
	// process message sending
	send(req, res, out, ssn);

	} else {
	// initial login

	// create
	MailUserData mud = new MailUserData(url);
	ssn.putValue("javamailservlet", mud);

	try {
	Properties props = System.getProperties();
	props.put("mail.smtp.host", host);
	Session session = Session.getDefaultInstance(props, null);
	session.setDebug(false);
	Store store = session.getStore(url);
	store.connect();
	Folder folder = store.getDefaultFolder();
	if (folder == null)
	throw new MessagingException("No default folder");

	folder = folder.getFolder(mbox);
	if (folder == null)
	throw new MessagingException("Invalid folder");

	folder.open(Folder.READ_WRITE);
	int totalMessages = folder.getMessageCount();
	Message[] msgs = folder.getMessages();
	FetchProfile fp = new FetchProfile();
	fp.add(FetchProfile.Item.ENVELOPE);
	folder.fetch(msgs, fp);

	// track who logged in
	System.out.println("Login from: " + store.getURLName());

	// save stuff into MUD
	mud.setSession(session);
	mud.setStore(store);
	mud.setFolder(folder);

	// splash
	out.print("<center>");
	out.print("<font face=\"Arial,Helvetica\" font size=+3>");
	out.println("<b>Welcome to JavaMail!</b></font></center><p>");

	// folder table
	out.println("<table width=\"50%\" border=0 align=center>");
	// folder name column header
	out.print("<tr><td width=\"75%\" bgcolor=\"#ffffcc\">");
	out.print("<font face=\"Arial,Helvetica\" font size=-1>");
	out.println("<b>FolderName</b></font></td><br>");
	// msg count column header
	out.print("<td width=\"25%\" bgcolor=\"#ffffcc\">");
	out.print("<font face=\"Arial,Helvetica\" font size=-1>");
	out.println("<b>Messages</b></font></td><br>");
	out.println("</tr>");
	// folder name
	out.print("<tr><td width=\"75%\" bgcolor=\"#ffffff\">");
	out.print("<a href=\"" + HttpUtils.getRequestURL(req) + "\">" +
	"Inbox" + "</a></td><br>");
	// msg count
	out.println("<td width=\"25%\" bgcolor=\"#ffffff\">" +
	totalMessages + "</td>");
	out.println("</tr>");
	out.println("</table");
	} catch (Exception ex) {
	out.println(ex.toString());
	} finally {
	out.println("</body></html>");
	out.close();
	}
	}
	}


	/**
	* This method handles the GET requests for the client.
	*/
	public void doGet (HttpServletRequest req, HttpServletResponse res)
	throws ServletException, IOException {

	HttpSession ses = req.getSession(false); // before we write to out
	ServletOutputStream out = res.getOutputStream();
	MailUserData mud = getMUD(ses);

	if (mud == null) {
	res.setContentType("text/html");
	out.println("<html><body>Please Login (no session)</body></html>");
	out.close();
	return;
	}

	if (!mud.getStore().isConnected()) {
	res.setContentType("text/html");
	out.println("<html><body>Not Connected To Store</body></html>");
	out.close();
	return;
	}


	// mux that takes a GET request, based on parameters figures
	// out what it should do, and routes it to the
	// appropriate method

	// get url parameters
	String msgStr = req.getParameter("message");
	String logout = req.getParameter("logout");
	String compose = req.getParameter("compose");
	String part = req.getParameter("part");
	int msgNum = -1;
	int partNum = -1;

	// process url params
	if (msgStr != null) {
	// operate on message "msgStr"
	msgNum = Integer.parseInt(msgStr);

	if (part == null) {
	// display message "msgStr"
	res.setContentType("text/html");
	displayMessage(mud, req, out, msgNum);

	} else {
	// display part "part" in message "msgStr"
	partNum = Integer.parseInt(part);
	displayPart(mud, msgNum, partNum, out, res);
	}

	} else if (compose != null) {
	// display compose form
	compose(mud, res, out);

	} else if (logout != null) {
	// process logout
	try {
	mud.getFolder().close(false);
	mud.getStore().close();
	ses.invalidate();
	out.println("<html><body>Logged out OK</body></html>");
	} catch (MessagingException mex) {
	out.println(mex.toString());
	}

	} else {
	// display headers
	displayHeaders(mud, req, out);
	}
	}

	/* main method to display messages */
	private void displayMessage(MailUserData mud, HttpServletRequest req,
	ServletOutputStream out, int msgNum)
	throws IOException {

	out.println("<html>");
	out.println("<HEAD><TITLE>JavaMail Servlet</TITLE></HEAD>");
	out.println("<BODY bgcolor=\"#ccccff\">");
	out.print("<center><font face=\"Arial,Helvetica\" ");
	out.println("font size=\"+3\"><b>");
	out.println("Message " + (msgNum+1) + " in folder " +
	mud.getStore().getURLName() +
	"/INBOX</b></font></center><p>");

	try {
	Message msg = mud.getFolder().getMessage(msgNum);

	// first, display this message's headers
	displayMessageHeaders(mud, msg, out);

	// and now, handle the content
	Object o = msg.getContent();

	//if (o instanceof String) {
	if (msg.isMimeType("text/plain")) {
	out.println("<pre>");
	out.println((String)o);
	out.println("</pre>");
	//} else if (o instanceof Multipart){
	} else if (msg.isMimeType("multipart/*")) {
	Multipart mp = (Multipart)o;
	int cnt = mp.getCount();
	for (int i = 0; i < cnt; i++) {
	displayPart(mud, msgNum, mp.getBodyPart(i), i, req, out);
	}
	} else {
	out.println(msg.getContentType());
	}

	} catch (MessagingException mex) {
	out.println(mex.toString());
	}

	out.println("</BODY></html>");
	out.close();
	}

	/**
	* This method displays a message part. <code>text/plain</code>
	* content parts are displayed inline. For all other parts,
	* a URL is generated and displayed; clicking on the URL
	* brings up the part in a separate page.
	*/
	private void displayPart(MailUserData mud, int msgNum, Part part,
	int partNum, HttpServletRequest req,
	ServletOutputStream out)
	throws IOException {

	if (partNum != 0)
	out.println("<p><hr>");

	try {

	String sct = part.getContentType();
	if (sct == null) {
	out.println("invalid part");
	return;
	}
	ContentType ct = new ContentType(sct);

	if (partNum != 0)
	out.println("<b>Attachment Type:</b> " +
	ct.getBaseType() + "<br>");

	if (ct.match("text/plain")) {
	// display text/plain inline
	out.println("<pre>");
	out.println((String)part.getContent());
	out.println("</pre>");

	} else {
	// generate a url for this part
	String s;
	if ((s = part.getFileName()) != null)
	out.println("<b>Filename:</b> " + s + "<br>");
	s = null;
	if ((s = part.getDescription()) != null)
	out.println("<b>Description:</b> " + s + "<br>");

	out.println("<a href=\"" +
	HttpUtils.getRequestURL(req) +
	"?message=" +
	msgNum + "&part=" +
	partNum + "\">Display Attachment</a>");
	}
	} catch (MessagingException mex) {
	out.println(mex.toString());
	}
	}

	/**
	* This method gets the stream from for a given msg part and
	* pushes it out to the browser with the correct content type.
	* Used to display attachments and relies on the browser's
	* content handling capabilities.
	*/
	private void displayPart(MailUserData mud, int msgNum,
	int partNum, ServletOutputStream out,
	HttpServletResponse res)
	throws IOException {

	Part part = null;

	try {
	Message msg = mud.getFolder().getMessage(msgNum);

	Multipart mp = (Multipart)msg.getContent();
	part = mp.getBodyPart(partNum);

	String sct = part.getContentType();
	if (sct == null) {
	out.println("invalid part");
	return;
	}
	ContentType ct = new ContentType(sct);

	res.setContentType(ct.getBaseType());
	InputStream is = part.getInputStream();
	int i;
	while ((i = is.read()) != -1)
	out.write(i);
	out.flush();
	out.close();
	} catch (MessagingException mex) {
	out.println(mex.toString());
	}
	}

	/**
	* This is a utility message that pretty-prints the message
	* headers for message that is being displayed.
	*/
	private void displayMessageHeaders(MailUserData mud, Message msg,
	ServletOutputStream out)
	throws IOException {

	try {
	out.println("<b>Date:</b> " + msg.getSentDate() + "<br>");

	Address[] fr = msg.getFrom();
	if (fr != null) {
	boolean tf = true;
	out.print("<b>From:</b> ");
	for (int i = 0; i < fr.length; i++) {
	out.print(((tf) ? " " : ", ") + getDisplayAddress(fr[i]));
	tf = false;
	}
	out.println("<br>");
	}

	Address[] to = msg.getRecipients(Message.RecipientType.TO);
	if (to != null) {
	boolean tf = true;
	out.print("<b>To:</b> ");
	for (int i = 0; i < to.length; i++) {
	out.print(((tf) ? " " : ", ") + getDisplayAddress(to[i]));
	tf = false;
	}
	out.println("<br>");
	}

	Address[] cc = msg.getRecipients(Message.RecipientType.CC);
	if (cc != null) {
	boolean cf = true;
	out.print("<b>CC:</b> ");
	for (int i = 0; i < cc.length; i++) {
	out.print(((cf) ? " " : ", ") + getDisplayAddress(cc[i]));
	cf = false;
	}
	out.println("<br>");
	}

	out.print("<b>Subject:</b> " +
	((msg.getSubject() !=null) ? msg.getSubject() : "") +
	"<br>");

	} catch (MessagingException mex) {
	out.println(msg.toString());
	}
	}

	/**
	* This method displays the URL's for the available commands and the
	* INBOX headerlist
	*/
	private void displayHeaders(MailUserData mud,
	HttpServletRequest req,
	ServletOutputStream out)
	throws IOException {

	SimpleDateFormat df = new SimpleDateFormat("EE M/d/yy");

	out.println("<html>");
	out.println("<HEAD><TITLE>JavaMail Servlet</TITLE></HEAD>");
	out.println("<BODY bgcolor=\"#ccccff\"><hr>");
	out.print("<center><font face=\"Arial,Helvetica\" font size=\"+3\">");
	out.println("<b>Folder " + mud.getStore().getURLName() +
	"/INBOX</b></font></center><p>");

	// URL's for the commands that are available
	out.println("<font face=\"Arial,Helvetica\" font size=\"+3\"><b>");
	out.println("<a href=\"" +
	HttpUtils.getRequestURL(req) +
	"?logout=true\">Logout</a>");
	out.println("<a href=\"" +
	HttpUtils.getRequestURL(req) +
	"?compose=true\" target=\"compose\">Compose</a>");
	out.println("</b></font>");
	out.println("<hr>");

	// List headers in a table
	out.print("<table cellpadding=1 cellspacing=1 "); // table
	out.println("width=\"100%\" border=1>"); // settings

	// sender column header
	out.println("<tr><td width=\"25%\" bgcolor=\"ffffcc\">");
	out.println("<font face=\"Arial,Helvetica\" font size=\"+1\">");
	out.println("<b>Sender</b></font></td>");
	// date column header
	out.println("<td width=\"15%\" bgcolor=\"ffffcc\">");
	out.println("<font face=\"Arial,Helvetica\" font size=\"+1\">");
	out.println("<b>Date</b></font></td>");
	// subject column header
	out.println("<td bgcolor=\"ffffcc\">");
	out.println("<font face=\"Arial,Helvetica\" font size=\"+1\">");
	out.println("<b>Subject</b></font></td></tr>");

	try {
	Folder f = mud.getFolder();
	int msgCount = f.getMessageCount();
	Message m = null;
	// for each message, show its headers
	for (int i = 1; i <= msgCount; i++) {
	m = f.getMessage(i);

	// if message has the DELETED flag set, don't display it
	if (m.isSet(Flags.Flag.DELETED))
	continue;

	// from
	out.println("<tr valigh=middle>");
	out.print("<td width=\"25%\" bgcolor=\"ffffff\">");
	out.println("<font face=\"Arial,Helvetica\">" +
	((m.getFrom() != null) ?
	m.getFrom()[0].toString() :
	"" ) +
	"</font></td>");

	// date
	out.print("<td nowrap width=\"15%\" bgcolor=\"ffffff\">");
	out.println("<font face=\"Arial,Helvetica\">" +
	df.format((m.getSentDate()!=null) ?
	m.getSentDate() : m.getReceivedDate()) +
	"</font></td>");

	// subject & link
	out.print("<td bgcolor=\"ffffff\">");
	out.println("<font face=\"Arial,Helvetica\">" +
	"<a href=\"" +
	HttpUtils.getRequestURL(req) +
	"?message=" +
	i + "\">" +
	((m.getSubject() != null) ?
	m.getSubject() :
	"<i>No Subject</i>") +
	"</a>" +
	"</font></td>");
	out.println("</tr>");
	}
	} catch (MessagingException mex) {
	out.println("<tr><td>" + mex.toString() + "</td></tr>");
	mex.printStackTrace();
	}

	out.println("</table>");
	out.println("</BODY></html>");
	out.flush();
	out.close();
	}

	/**
	* This method handles the request when the user hits the
	* <i>Compose</i> link. It send the compose form to the browser.
	*/
	private void compose(MailUserData mud, HttpServletResponse res,
	ServletOutputStream out)
	throws IOException {

	res.setContentType("text/html");
	out.println(composeForm);
	out.close();
	}

	/**
	* This method processes the send request from the compose form
	*/
	private void send(HttpServletRequest req, HttpServletResponse res,
	ServletOutputStream out, HttpSession ssn)
	throws IOException {

	String to = req.getParameter("to");
	String cc = req.getParameter("cc");
	String subj = req.getParameter("subject");
	String text = req.getParameter("text");

	try {
	MailUserData mud = getMUD(ssn);
	if (mud == null)
	throw new Exception("trying to send, but not logged in");

	Message msg = new MimeMessage(mud.getSession());
	InternetAddress[] toAddrs = null, ccAddrs = null;

	if (to != null) {
	toAddrs = InternetAddress.parse(to, false);
	msg.setRecipients(Message.RecipientType.TO, toAddrs);
	} else
	throw new MessagingException("No \"To\" address specified");

	if (cc != null) {
	ccAddrs = InternetAddress.parse(cc, false);
	msg.setRecipients(Message.RecipientType.CC, ccAddrs);
	}

	if (subj != null)
	msg.setSubject(subj);

	URLName u = mud.getURLName();
	msg.setFrom(new InternetAddress(u.getUsername() + "@" +
	u.getHost()));

	if (text != null)
	msg.setText(text);

	Transport.send(msg);

	out.println("<h1>Message sent successfully</h1></body></html>");
	out.close();

	} catch (Exception mex) {
	out.println("<h1>Error sending message.</h1>");
	out.println(mex.toString());
	out.println("<br></body></html>");
	}
	}


	// utility method; returns a string suitable for msg header display
	private String getDisplayAddress(Address a) {
	String pers = null;
	String addr = null;
	if (a instanceof InternetAddress &&
	((pers = ((InternetAddress)a).getPersonal()) != null)) {

	addr = pers + " "+"<"+((InternetAddress)a).getAddress()+">";
	} else
	addr = a.toString();

	return addr;
	}

	// utility method; retrieve the MailUserData
	// from the HttpSession and return it
	private MailUserData getMUD(HttpSession ses) throws IOException {
	MailUserData mud = null;

	if (ses == null) {
	return null;
	} else {
	if ((mud = (MailUserData)ses.getValue("javamailservlet")) == null){
	return null;
	}
	}
	return mud;
	}


	public String getServletInfo() {
	return "A mail reader servlet";
	}

	/**
	* This is the HTML code for the compose form. Another option would
	* have been to use a separate html page.
	*/
	private static String composeForm = "<HTML><HEAD><TITLE>JavaMail Compose</TITLE></HEAD><BODY BGCOLOR=\"#CCCCFF\"><FORM ACTION=\"/servlet/JavaMailServlet\" METHOD=\"POST\"><input type=\"hidden\" name=\"send\" value=\"send\"><P ALIGN=\"CENTER\"><B><FONT SIZE=\"4\" FACE=\"Verdana, Arial, Helvetica\">JavaMail Compose Message</FONT></B><P><TABLE BORDER=\"0\" WIDTH=\"100%\"><TR><TD WIDTH=\"16%\" HEIGHT=\"22\"> <P ALIGN=\"RIGHT\"><B><FONT FACE=\"Verdana, Arial, Helvetica\">To:</FONT></B></TD><TD WIDTH=\"84%\" HEIGHT=\"22\"><INPUT TYPE=\"TEXT\" NAME=\"to\" SIZE=\"30\"> <FONT SIZE=\"1\" FACE=\"Verdana, Arial, Helvetica\"> (separate addresses with commas)</FONT></TD></TR><TR><TD WIDTH=\"16%\"><P ALIGN=\"RIGHT\"><B><FONT FACE=\"Verdana, Arial, Helvetica\">CC:</FONT></B></TD><TD WIDTH=\"84%\"><INPUT TYPE=\"TEXT\" NAME=\"cc\" SIZE=\"30\"> <FONT SIZE=\"1\" FACE=\"Verdana, Arial, Helvetica\"> (separate addresses with commas)</FONT></TD></TR><TR><TD WIDTH=\"16%\"><P ALIGN=\"RIGHT\"><B><FONT FACE=\"Verdana, Arial, Helvetica\">Subject:</FONT></B></TD><TD WIDTH=\"84%\"><INPUT TYPE=\"TEXT\" NAME=\"subject\" SIZE=\"55\"></TD></TR><TR><TD WIDTH=\"16%\"> </TD><TD WIDTH=\"84%\"><TEXTAREA NAME=\"text\" ROWS=\"15\" COLS=\"53\"></TEXTAREA></TD></TR><TR><TD WIDTH=\"16%\" HEIGHT=\"32\"> </TD><TD WIDTH=\"84%\" HEIGHT=\"32\"><INPUT TYPE=\"SUBMIT\" NAME=\"Send\" VALUE=\"Send\"><INPUT TYPE=\"RESET\" NAME=\"Reset\" VALUE=\"Reset\"></TD></TR></TABLE></FORM></BODY></HTML>";

	}


	/**
	* This class is used to store session data for each user's session. It
	* is stored in the HttpSession.
	*/
	class MailUserData {
	URLName url;
	Session session;
	Store store;
	Folder folder;

	public MailUserData(URLName urlname) {
	url = urlname;
	}

	public URLName getURLName() {
	return url;
	}

	public Session getSession() {
	return session;
	}

	public void setSession(Session s) {
	session = s;
	}

	public Store getStore() {
	return store;
	}

	public void setStore(Store s) {
	store = s;
	}

	public Folder getFolder() {
	return folder;
	}

	public void setFolder(Folder f) {
	folder = f;
	}
	}