Source to keep somewhere: 2 classes to send emails.

In order to work these classes requires activation.jar et mail.jar
First java class : email data object.

package com.ledruide.utils.mail;

import java.util.ArrayList;
import java.util.List;

/**
 * @author JRA
 * @since 26 fev. 2005
 */
public class Mail {

    public String login         = null;
    public String password      = null;
    public String host          = null;
    public List<String> to      = null;
    public List<String> cc      = null;
    public List<String> bcc     = null;
    public List<String> attach  = null;
    public String from          = null;
    public String fromName      = null;
    public String replyTo       = null;
    public String subject       = null;
    public String mode          = "html";
    public String content       = null;
    public String priority      = null;
    
    
    public String getLogin() {
        return login;
    }
    public void setLogin(String string) {
        login = string;
    }

    public String getPassword() {
        return password;
    }
    public void setPassword(String string) {
        password = string;
    }

    public String getHost() {
        return host;
    }
    public void setHost(String string) {
        host = string;
    }

    public String getFrom() {
        return from;
    }
    public void setFrom(String string) {
        from = string;
    }

    public String getFromName() {
        return fromName;
    }
    public void setFromName(String string) {
        fromName = string;
    }

    public String getReplyTo() {
        return replyTo;
    }
    public void setReplyTo(String string) {
        replyTo = string;
    }

    public String getSubject() {
        return subject;
    }
    public void setSubject(String string) {
        subject = string;
    }

    public String getMode() {
        return mode;
    }
    public void setMode(String string) {
        mode = string;
    }

    public String getContent() {
        return content;
    }
    public void setContent(String string) {
        content = string;
    }

    public List<String> getTo() {
        return to;
    }
    public void setTo(List<String> list) {
        to = list;
    }
    public void addTo(String string) {
        if (to == null) {
            to = new ArrayList<String>();
        }
        to.add(string);
    }

    public List<String> getCc() {
        return cc;
    }
    public void setCc(List<String> list) {
        cc = list;
    }
    public void addCc(String string) {
        if (cc == null) {
            cc = new ArrayList<String>();
        }
        cc.add(string);
    }

    public List<String> getBcc() {
        return bcc;
    }
    public void setBcc(List<String> list) {
        bcc = list;
    }
    public void addBcc(String string) {
        if (bcc == null) {
            bcc = new ArrayList<String>();
        }
        bcc.add(string);
    }

    public List<String> getAttach() {
        return attach;
    }
    public void setAttach(List<String> list) {
        attach = list;
    }
    public void addAttach(String string) {
        if (attach == null) {
            attach = new ArrayList<String>();
        }
        attach.add(string);
    }

    public String getPriority(){
        return priority;
    }
    public void setPriority( String priority ){
        this.priority = priority;
    }
}
</pre>

Second java class, email send job:
<pre class="brush:java>
package com.ledruide.utils.mail;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.Date;
import java.util.Iterator;
import java.util.List;
import java.util.Properties;
import java.util.StringTokenizer;

import javax.activation.DataHandler;
import javax.activation.FileDataSource;
import javax.mail.BodyPart;
import javax.mail.Message;
import javax.mail.Multipart;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;


/**
 * EnvoiMail
 * Classe permettant d'envoyer un mail acceptant comme parametres :
 *
 * Emetteur.
 * Adresse de retour.
 * Destinataires (TO, CC, BCC).
 * Fichiers attachés.
 * Nom de serveur SMTP
 * Nom d'utilisateur
 * Mot de passe (au cas ou..)
 * Sujet
 * Contenu
 * @author JRA
 * @since 26 fev. 2005
 */
public final class SendMail {

    private SendMail() {    }
    
    /**
     * Permet d'utiliser le programme en ligne de commande
     * de facon independante.<BR>
     * Usage : EnvoiMail [-l login -p password -H host <br>
     *                  -TO to@to1.com;to@to2.com -CC cc@cc1.com;cc@cc2.com -BCC bcc@bcc1.com;bcc@bcc2.com <BR>
     *                  -F fichierAttaché1;fichierAttaché2 -e emetteur -r adresseReponse <BR>
     *                  Sujet et contenu sont demandés ensuite.
     *
     * @param args
     */
    public static void main (final String[] args) {
        if (args.length < 4) {
            System.out.println(usage());
            System.exit(1);
        } else {
            try {
                System.out.println("constructParam");
                final Mail arguments = constructParam(args);
                System.out.println("createMessage");
                createMessage(arguments);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

    public static String usage() {
        return "\nUsage : SendMail &#91;-l login\n" + 
               "\t-p password\n" + 
               "\t-H host\n" +
               "\t-TO to@to1.com;to@to2.com\n" + 
               "\t-CC cc@cc1.com;cc@cc2.com\n" + 
               "\t-BCC bcc@bcc1.com;bcc@bcc2.com\n" +
               "\t-F fichierAttache1;fichierAttache2\n" + 
               "\t-e emetteur\n" + 
               "\t-r adresseReponse\n" +
               "\t-m mode&#91;text or html(default)&#93;\n" +
               "\nLe sujet et le contenu sont demandes ensuite...";
    }

    /**
     * Construit la HashMap en fonction des arguments passés en ligne de commande
     * <h4>Ne doit être appelé que par le main en ligne de commande !<h4>
     *
     * @param args les arguments de la ligne de commande
     * @return la HashMap construite.
     */
    private static Mail constructParam (final String[] args) throws Exception {

        final Mail courriel = new Mail();
        StringTokenizer tokenizer;
        final String separateur = ";";

        final BufferedReader in = new BufferedReader(new InputStreamReader(System.in));

        int i;
        for (i = 0; i < args.length; i++) {

            /* LOGIN */
            if ("-l".equalsIgnoreCase(args&#91;i&#93;)) {
                courriel.setLogin(args&#91;++i&#93;);
                System.out.println("login = " + courriel.getLogin());
            }
            /* PASSWORD */
            else if ("-p".equalsIgnoreCase(args&#91;i&#93;)) {
                courriel.setPassword(args&#91;++i&#93;);
                System.out.println("password = " + courriel.getPassword());
            }
            /* HOST */
            else if ("-H".equalsIgnoreCase(args&#91;i&#93;)) {
                courriel.setHost(args&#91;++i&#93;);
                System.out.println("host = " + courriel.getHost());
            }
            /* EMETTEUR */
            else if ("-e".equalsIgnoreCase(args&#91;i&#93;)) {
                courriel.setFrom(args&#91;++i&#93;);
                System.out.println("emetteur = " + courriel.getFrom());
            }
            /* ADRESSE REPONSE */
            else if ("-r".equalsIgnoreCase(args&#91;i&#93;)) {
                courriel.setReplyTo(args&#91;++i&#93;);
                System.out.println("addresseReponse = " + courriel.getReplyTo());
            }
            /* TO */
            else if ("-TO".equalsIgnoreCase(args&#91;i&#93;)) {
                tokenizer = new StringTokenizer(args&#91;++i&#93;, separateur);
                while (tokenizer.hasMoreElements()) {
                    courriel.addTo(tokenizer.nextElement().toString());
                }
            }
            /* CC */
            else if ("-CC".equalsIgnoreCase(args&#91;i&#93;)) {
                tokenizer = new StringTokenizer(args&#91;++i&#93;, separateur);
                while (tokenizer.hasMoreElements()) {
                    courriel.addCc(tokenizer.nextElement().toString());
                }
            }
            /* BCC */
            else if ("-BCC".equalsIgnoreCase(args&#91;i&#93;)) {
                tokenizer = new StringTokenizer(args&#91;++i&#93;, separateur);
                while (tokenizer.hasMoreElements()) {
                    courriel.addBcc(tokenizer.nextElement().toString());
                }
            }
            /* MODE */
            else if ("-m".equalsIgnoreCase(args&#91;i&#93;)) {
                courriel.setMode(args&#91;++i&#93;);
                System.out.println("mode = " + courriel.getMode());
            }
            /* FICHIERS ATTACHES */
            else if ("-F".equalsIgnoreCase(args&#91;i&#93;)) {
                tokenizer = new StringTokenizer(args&#91;++i&#93;, separateur);
                while (tokenizer.hasMoreElements()) {
                    courriel.addAttach(tokenizer.nextElement().toString());
                }
            }/* SINON AFFICHER L'AIDE */
            else {
                System.out.println(usage());
                System.exit(1);
                break;
            }
        }
        System.out.print("Sujet: ");
        System.out.flush();
        final String sujet = in.readLine();
        courriel.setSubject(sujet);
        System.out.print("Contenu: ");
        System.out.flush();
        final StringBuffer contenu = new StringBuffer(in.readLine());
        courriel.setContent(contenu.toString());

        return courriel;
    }

    /**
     * Methode d'envoi du message.<br>
     * Inclus le traitement des parametres envoyés (test des paramètres nécessaires.
     *
     * @param mail Mail contenant les paramètres du message
     * @exception Exception if an error occurs
     */
    public static void createMessage (final Mail mail) throws Exception {
        final StringBuffer probleme = new StringBuffer(2000);
        if (!testParametres(mail, probleme)) {
            throw new Exception(probleme.toString());
        }

        final Properties properties = System.getProperties();
        properties.put("mail.smtp.host", mail.getHost());

        final Session session = Session.getInstance(properties, null);
        /*
        * Inclusion de toutes les variables d'envoi.
        */
        final MimeMessage message = new MimeMessage(session);
        final Multipart multiPart = new MimeMultipart();

        /* SET FROM */
        message.setFrom(new InternetAddress(mail.getFrom().toString()));

        /* REPLY TO */
        final String replyTo = mail.getReplyTo().toString();
        //message.setReplyTo(ia.parse(replyTo));
        message.setReplyTo(InternetAddress.parse(replyTo));

        /* DESTINATAIRE(S) */
        Iterator lEnum = mail.getTo().iterator();
        while (lEnum.hasNext()) {
            final String dest = lEnum.next().toString();
            final InternetAddress destIA = new InternetAddress(dest);
            message.addRecipient(Message.RecipientType.TO, destIA);
        }

        /* CARBON COPY */
        lEnum = mail.getCc().iterator();
        while (lEnum.hasNext()) {
            final String dest = lEnum.next().toString();
            final InternetAddress destIA = new InternetAddress(dest);
            message.addRecipient(Message.RecipientType.CC, destIA);
        }

        /* BLIND CARBON COPY */
        lEnum = mail.getBcc().iterator();
        while (lEnum.hasNext()) {
            final String dest = lEnum.next().toString();
            final InternetAddress destIA = new InternetAddress(dest);
            message.addRecipient(Message.RecipientType.BCC, destIA);
        }

        /* SUJET */
        message.setSubject(mail.getSubject());

        /* DATE D'ENVOI */
        message.setSentDate(new Date());

        /* TYPE MIME DE LA PARTIE CONTENU DU MESSAGE */
        String charset="utf-8";

        final MimeBodyPart mbpMessage = new MimeBodyPart();
        if ("html".equalsIgnoreCase(mail.getMode())) {
            mbpMessage.setContent(mail.getContent(), "text/html");
        }
        else {
            mbpMessage.setText(mail.getContent());
        }

        /* AJOUT DU CONTENU AU MESSAGE EN 1ERE PARTIE */
        multiPart.addBodyPart(mbpMessage);

        /* FICHIERS ATTACHES */
        MimeBodyPart mbpAttach;

        List fichiers = mail.getAttach();
        if (fichiers != null) {
            lEnum = fichiers.iterator();
            while (lEnum.hasNext()) {
                String name = lEnum.next().toString();
                File fichier = new File(name);
                mbpAttach = new MimeBodyPart();
                FileDataSource fds = new FileDataSource(name);
                mbpAttach.setDataHandler(new DataHandler(fds));
                mbpAttach.setFileName(fichier.getName());
                /* AJOUT DU CONTENU AU MESSAGE EN 1ERE PARTIE */

                multiPart.addBodyPart(mbpAttach);
            }
        }
        message.setContent(multiPart);
        /*
        * Transport du message
        */
        try {
            if ("".equals(mail.getLogin()) && "".equals(mail.getPassword())) {
                Transport.send(message, message.getAllRecipients());
            }
            else {
                final Transport transport = session.getTransport("smtp");
                transport.connect(mail.getHost(), mail.getLogin(), mail.getPassword());
                transport.sendMessage(message, message.getAllRecipients());
                transport.close();
            }
        }catch (Exception e) {
            e.printStackTrace();
            throw e;
        }
    }

    /**
     * Teste la validités des parametres reçu dans la HashMap
     *
     * @param map la Map des parametres a tester
     * @return true si tous les parametres sont testés avec succès
     */
    private static boolean testParametres (final Mail mail, final StringBuffer probleme) {

        boolean ok = true;
        probleme.append("\n*****************************");
        probleme.append("\n**** PROBLEMS :");
        if (mail == null) {
            probleme.append("\nNothing to send ! ........KO");
            ok = false;
        }
        else {

            /*
            * Verification de la validites de tous les parametres pour
            * eviter plus tard une NullPointerException
            */
            if ( mail.getLogin() == null ) {
                probleme.append("\nNo login..................OK");
                mail.setLogin("");
            }
            if ( mail.getPassword() == null ) {
                mail.setPassword("");
                probleme.append("\nNo password...............OK");
            }
            if ( mail.getFrom() == null ) {
                mail.setFrom("");
                probleme.append("\nNo From...................OK");
            }
            if ( mail.getReplyTo() == null ) {
                mail.setReplyTo(mail.getFrom());
                probleme.append("\nNo Reply to...............OK");
            }
            if ( mail.getHost() == null ) {
                mail.setHost("");
                probleme.append("\nNo SMTP Host...........FATAL");
                ok = false;
            }
            if ( mail.getSubject() == null ) {
                mail.setSubject("");
                probleme.append("\nNo subject................OK");
            }
            if ( mail.getMode() == null ) {
                mail.setMode("html");
                probleme.append("\nNo mode...................OK");
            }
            if ( mail.getContent() == null ) {
                mail.setContent("");
                probleme.append("\nNo content................OK");
            }
            if ( mail.getTo() == null ) {
                mail.setTo(new ArrayList<String>(0));
                probleme.append("\nNo recipient TO........FATAL");
                ok = false;
            }
            if ( mail.getCc() == null ) {
                mail.setCc(new ArrayList<String>(0));
                probleme.append("\nNo Carbon Copy............OK");
            }
            if ( mail.getBcc() == null ) {
                mail.setBcc(new ArrayList<String>(0));
                probleme.append("\nNo Blind Carbon Copy......OK");
            }
            /*
            * Ici je regarde de quel type sont les fichiers que je recoit File ou URL
            */
            if ( mail.getAttach() != null ) {
                List fichiers = mail.getAttach();
                Iterator ite = fichiers.iterator();
                while (ite.hasNext()) {
                    final String name = (String)ite.next();
                    // Try to open URL connection first
                    try {
                        URL url = new URL(name);
                        //InputStream file = null;
                        url.openStream();
                    } 
                    catch (MalformedURLException e) {
                        // Try to open plain file, if `name' is not a URL specification
                        try {
                            //InputStream file = null;
                            new FileInputStream(name);
                        } catch (FileNotFoundException ex) {
                            probleme.append("\nAttached file '" + name + "' not found.....FATAL");
                            ok = false;
                        }
                    } catch (IOException ex) {
                        probleme.append("\nAttached file '" + name + "' not found.....FATAL");
                        ok = false;
                    }
                } //while
            } else {
                probleme.append("\nNo attached file..........OK");
            }
        }
        probleme.append("\n*****************************");
        return ok;
    }
}

Source to keep somewhere: Encoder and decode in base 64

/*********************************************************/
/* Coder ou décoder en Base64 */
/*********************************************************/
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

public class Base64 {

public static void main(String[] args) {

if (args.length < 1) { System.out.println("Usage : java Base64 [Chaine a coder et decoder]"); System.exit(-1); } new Base64(args[0]); } public Base64(String chaine) { System.out.println("Encodage de " + chaine + " = " + encode(chaine)); System.out.println("Decodage de " + chaine + " = " + decode(chaine)); } private String encode(String toEncode) { String encoded = toEncode; BASE64Encoder encoder = new BASE64Encoder(); try { encoded = new String(encoder.encodeBuffer(encoded.getBytes())); } catch (Exception e) { System.out.println("Probleme lors du codage !" + e); } return encoded; } private String decode(String toDecode) { String decoded = toDecode; BASE64Decoder decoder = new BASE64Decoder(); try { decoded = new String(decoder.decodeBuffer(decoded)); } catch (Exception e) { System.out.println("Probleme lors du decodage !" + e); } return decoded; } } [/java]