Sending mail to a group

Question

Hi all
I got the following example from the net. This is to send mail to one person, but how do I send the same message to more than one person?
Thanx
import javax.mail.*;
import javax.mail.internet.*;
import java.util.*;
public void postMail( String recipients[ ], String subject, String message , String from) throws MessagingException
boolean debug = false;
//Set the host smtp address
Properties props = new Properties();
props.put("mail.smtp.host", "smtp.jcom.net");
// create some properties and get the default Session
Session session = Session.getDefaultInstance(props, null);
session.setDebug(debug);
// create a message
Message msg = new MimeMessage(session);
// set the from and to address
InternetAddress addressFrom = new InternetAddress(from);
msg.setFrom(addressFrom);
InternetAddress[] addressTo = new InternetAddress[recipients.length];
for (int i = 0; i < recipients.length; i++)
addressTo[i] = new InternetAddress(recipients);
msg.setRecipients(Message.RecipientType.TO, addressTo);
msg.addHeader("MyHeaderName", "myHeaderValue");
// Setting the Subject and Content Type
msg.setSubject(subject);
msg.setContent(message, "text/plain");
Transport.send(msg);

Answer 1

Here is an SMTP class I wrote using java mail. It supports mulitple addresses and attachements. When calling setToAddress make sure your addresses are in a string each seperated by a semi colon.
package com.elg.utils;
import java.util.*;
import java.io.*;
import javax.mail.*;
import javax.mail.internet.*;
import javax.activation.*;
*This class is used to provide a easier means to send an smtp email using Java Mail
* Last Updated: 11-3-2003  By: Paul Zepernick
* @author     Paul Zepernick
* @version 1.0
public class SmtpEmail {
     /**array to hold attachments*/
     private ArrayList attachments = null;
     /**from email address*/
     private String fromAddress = null;
     /**to email address*/
     private String toAddress = null;
     /**email subject*/
     private String subject = null;
     /**email body*/
     private String emailBody = null;
     /**email properties*/
     private Properties props = null;
      * Constructs a new smtp class.
      * @param Smtp Server
      * @param Smtp Port - should be set to 25 for default
     public SmtpEmail(String smtpServer,int port){
          super();
          props = System.getProperties();
          props.put("mail.smtp.host",smtpServer);
          props.put("mail.smtp.port",String.valueOf(port)); 
          attachments = new ArrayList();
     public void sendMail() throws MessagingException{
               Session s = Session.getInstance(props,null);          
               MimeMessage message = new MimeMessage(s);     
               message.setFrom(new InternetAddress(fromAddress));
               message.addRecipients(Message.RecipientType.TO, buildAddress(toAddress));
               message.setSubject(subject);
               if (attachments.size() == 0){
                    message.setContent(emailBody, "text/plain");
               }else{
                    Multipart mp = new MimeMultipart();
                    message.setContent(mp);
                    // Message part 1 is text - add to multipart
                    MimeBodyPart m1 = new MimeBodyPart();
                    m1.setContent(emailBody, "text/plain");
                    mp.addBodyPart(m1);
                    // Message part 2 is binary (file to send)
                    MimeBodyPart m2 = null;
                    /**add attachments to the multipart message*/
                    for (int i=0; i<attachments.size(); i++){
                         FileDataSource fds = new FileDataSource((String)attachments.get(i));
                         m2 = new MimeBodyPart();
                         m2.setDataHandler(new DataHandler(fds) );
                         m2.setFileName( new File((String)attachments.get(i)).getName() );
                         mp.addBodyPart(m2);     
               Transport.send(message);
               return;
      * Attachs a file to the email
      * @param String path to file
      * @return void
      * @exception FileNotFound
    public void attachFile(String path) throws FileNotFoundException{
         if (!new File(path).exists()){
              throw new FileNotFoundException ("INVALID FILE");
         attachments.add(path);
      * Sets the emailBody.
      * @param emailBody The emailBody to set
     public void setEmailBody(String emailBody) {
          this.emailBody = emailBody;
      * Sets the fromAddress.
      * @param fromAddress The fromAddress to set
     public void setFromAddress(String fromAddress) {
          this.fromAddress = fromAddress;
      * Sets the toAddress. Seperate multiple to addresses by a semi colon
      * @param toAddress The toAddress to set
     public void setToAddress(String toAddress) {
          this.toAddress = toAddress;
      * Sets the subject.
      * @param subject The subject to set
     public void setSubject(String subject) {
          this.subject = subject;
      * Builds a to address array
      * @param String address list semi colon seperated
      * @return InternetAddress
     private static InternetAddress[] buildAddress(String addressList) throws AddressException{
          StringTokenizer st = new StringTokenizer(addressList, ";");
          InternetAddress[] address = new InternetAddress[st.countTokens()];
          int i = 0;
          while ( st.hasMoreTokens() ){
               address[i++] = new InternetAddress( st.nextToken() );
          return address;
}