Sending emails automatically

Question

does anybody know how to send emails automatically if it meets the requirement, for example, will send emails automatically if an account balance is less than $100? are there any codes to guide me?

Answer 1

Here's some code, just pass in the to, from, subject, and body in the constructor... You'll have to tweak the mail server ip's, etc... You need mail.jar, which is available somewhere on java.sun.com.
I just use it to send email from my appserver, and I'm not using all the capabilities.. You can send attachments, multi-part mime, etc.. This class can easily be modified to do spamming, mailbombs, or newslists.
import java.util.*;
import java.io.*;
import javax.mail.*;
import javax.mail.internet.*;
public class Mailer{
    public Mailer(String to, String fr, String subj, String mess1) {
        System.out.println("class Mailer sending a msg..");
         String from = null;
         String toUser=null;
         String host = "mail.yourdomain.net";  //MAIL SERVER HOSTNAME
         boolean debug = false;
         String msgText1 = "";
         String subject = "";
        try{
            toUser = to.trim();
        }catch(Exception e){to = "[email protected]";}
         try {
             msgText1 = mess1.trim();
         }catch(Exception e){}
         try {
             from=fr;
         }catch(Exception ex){}
         // create some properties and get the default Session
         Properties props = System.getProperties();
         props.put("mail.smtp.host", host);                   //to be honest, i have no idea
         props.put("mail.user","[email protected]");//what these 2 lines are for..
         Session session = Session.getDefaultInstance(props, null);
         session.setDebug(debug);
         try {
             // create a message
             MimeMessage msg = new MimeMessage(session);
             msg.setFrom(new InternetAddress(from));
                InternetAddress[] address={new InternetAddress(toUser)};
                try {
                    address[0].setPersonal(null);
                }catch(Exception ex){System.out.println("couldn't null out personal info in address[0]");}
             msg.setRecipients(Message.RecipientType.TO, address);
             msg.setSubject(props.getProperty("user.dir"));
             // create and fill the first message part
             MimeBodyPart mbp1 = new MimeBodyPart();
             //mbp1.setText(msgText1);
             // create the Multipart and its parts to it
             Multipart mp = new MimeMultipart();
             // add the Multipart to the message
             msg.setContent(mp);
             // set the Date: header
             msg.setSentDate(new Date());
             msg.setText(msgText1);
            try {
                subject=subj.trim();
                msg.setSubject(subject);
             }catch(Exception ex){System.out.println("no subj..");}
             // send the message
             Transport.send(msg);
         } catch (MessagingException mex) {
             System.out.println("error in DPWMailer: "+mex);
             mex.printStackTrace();
             Exception ex = null;
             if ((ex = mex.getNextException()) != null) {
              ex.printStackTrace();
          //{{INIT_CONTROLS
     //{{DECLARE_CONTROLS
}