Automatic mail using jsp and javamail

[techkar]

hi experts,

Here there is a requirement in my project, like sending a automatic mail to a particular person,at particular time.

for examples:

If there is an expiry date for a customer's account, a week before the expiry date a mail should be send to the customer as a remainder.
But, at present I use to send mails manually.

If there is any suggestions or replies on this concept are appreciated.

Thanks,

[aniseed]

Sometimes Google could get you lucky!

[jwenting]

not something you'd use JSP for anyway. A background process started from your crontab would be the most logical choice, or alternatively an autostarting servlet running a background thread if the functionality is an integral part of a web application.

[lifayan]

here is some example code , i use it to send google mail.

public void smtp(String receiver, String content) throws MessagingException {
if (smtpHost == null)
throw new MessagingException("smtpHost not found");
if (user == null)
throw new MessagingException("user not found");
if (password == null)
throw new MessagingException("password not found");
Properties properties = new Properties();
properties.put("mail.smtp.host", smtpHost); //set smtp server
properties.put("mail.smtp.auth", "true"); //use smtp authen properties.put("mail.transport.protocol", "smtp");
properties.put("mail.smtp.port", "25");
properties.put("mail.smtp.starttls.enable", "true");
Session session = Session.getDefaultInstance(properties,
new Authenticator() {
public PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication(user, password);
}
});
MimeMessage mimeMsg = new MimeMessage(session);
if (sender != null) {
mimeMsg.setFrom(new InternetAddress(sender));
}
if (receiver != null) {
mimeMsg.setRecipients(Message.RecipientType.TO, parse(receiver));
}
if (subject != null) {
mimeMsg.setSubject(subject, "GBK");
}
MimeBodyPart part = new MimeBodyPart();
part.setText(content == null ? "" : content, "GBK");


part.setContent(content.toString(), "text/html;charset=GBK");
Multipart multipart = new MimeMultipart();
multipart.addBodyPart(part);
mimeMsg.setContent(multipart);
mimeMsg.setSentDate(new Date());
Transport.send(mimeMsg);
}

[techkar]

Thanks for your response, the sample code given by you is to send a mail using javamail API and my problem is, that mail should be send in a scheduled time.

for example: every, week end. (or) by date.

any idea, please suggest.

[lifayan]

that is simple ,if you use a j2ee container such as tomcat ,
here is a example

this is a ServletContextListener  you should config it in web.xml so it will run auto when tomcat starts.


this is the web.xml config
<listener>
<listener-class>com.hecheng.util.ServletListenerTimmer</listener-class>
</listener>


you may need to change some field to fill your condition


public class ServletListenerTimmer implements ServletContextListener {
private java.util.Timer timer = null;
private Log mylogger = LogFactory.getLog(this.getClass());
public void contextInitialized(ServletContextEvent event) {
timer = new java.util.Timer(true);mylogger.info("timmer is started");
timer.schedule(new SendReport(event.getServletContext()), 0, 60 * 60 * 1000);mylogger.info("add sendmail task");
}
public void contextDestroyed(ServletContextEvent event) {
timer.cancel();mylogger.info("timmer destoryed");
}
}


public class SendReport extends TimerTask {
private static final int C_SCHEDULE_HOUR = 22;
private static boolean isRunning = false;
private ServletContext context = null;
public SendReport(ServletContext context) {
this.context = context;
}
public void run() {
Calendar cal = Calendar.getInstance();
if (!isRunning) {
System.out.println("cal.get(Calendar.HOUR_OF_DAY) = " + cal.get(Calendar.HOUR_OF_DAY));
if (C_SCHEDULE_HOUR == cal.get(Calendar.HOUR_OF_DAY)) {
isRunning = true;
doReportTask();// you can write your sendmail task there
isRunning = false;
}
} else {
context.log("the prevenient task is still running!");
}
}
]

[techkar]

Thanks for your reply, well its working fine.and thanks for spending your precious time to give the solution.

Regards.

[loan]

hi, i'm a student currently doing my project. looking for send mail code. i have look through those codes which u guys hav discussed above but can't work. can someone help me? Thanks , i urgently need help. thank you.

[nitin saxena]

I want to send a mail in my jsp page , but i want that address of the mail to whom i have to send that address is to be send by another jsp page .i am attaching both my jsp
<%
Properties props = new Properties();
props.put("mail.smtp.host", "");
Session s = Session.getInstance(props,null);
MimeMessage message = new MimeMessage(s);
InternetAddress from = new InternetAddress(" ")
message.setFrom(from);
out.println("Kq");

InternetAddress to = new InternetAddress("to ");

out.println("K");
message.addRecipient(Message.RecipientType.TO, to);

message.setSubject("hi");
message.setText(" hello how r u");
Transport.send(message);
%>
In "to" i want address from other jsp , what should i try, i had use session

[jwenting]

Kids, do your own homework.

Someone already posted a complete working solution (a really stupid thing to do as now people don't have to think anymore), and you still can't get it?

[Dhruv Shah]

Actually i dont know the name of my smtp host. should i write there localhost or my IP address... Please help me out..

Thanks

[jwenting]

if you don't know the mailserver you're talking to, you can't talk to it so you can't send mail.

It would be like wanting to make a phonecall without knowing the name of the person you're calling nor his number.

[jeet_portal]

Hi Techkar,
I have the same requirement as u have. In my project i have to send a automatic email to that users who are idle i mean not updated their data in our data base for some times. or some days. If u finally got the solution then pls send me the code .My email id [e-mail]

Thanx in advance

[jwenting]

You too are too lazy to look back a few messages?

And do NOT ask for personal help, it's extremely RUDE.

[flakita227]

Hi All...

I need execute a servlet any time of the date.
The example in this page... execute a task when the tomcat starts... but i have execute task in a date, hour, minute, second, it's read of the database mysql of an especific column table...
If any body have idea... tell me please...
Thanks...
Take care...
Good luck...