通过java在特定日期发送自动邮件

I am using Java mail API to send email through my java application. But I want to send it automatically on future date i.e. any specific date of every month/year. I have used my ISP's SMTP server to send email on mentioned id.I have referred the below available example on net. How to set any specific date here.I have tried SimpleDateFormat and set it here but it still sends mail immediately but set its sent date as mentioned specific date. Is there any other way to send automatic email on mentioned date and time?

import java.util.*;
import javax.mail.*;
import javax.mail.internet.*;
import javax.activation.*;

// Send a simple, single part, text/plain e-mail
public class TestEmail {

public static void main(String[] args) {

    // SUBSTITUTE YOUR EMAIL ADDRESSES HERE!!!
    String to = "abc@abc.com";
    String from = "abc@abc.com";
    // SUBSTITUTE YOUR ISP'S MAIL SERVER HERE!!!
    String host = "smtp.yourisp.net";

    // Create properties, get Session
    Properties props = new Properties();

    // If using static Transport.send(),
    // need to specify which host to send it to
    props.put("mail.smtp.host", host);
    // To see what is going on behind the scene
    props.put("mail.debug", "true");
    Session session = Session.getInstance(props);

    try {
        // Instantiatee a message
        Message msg = new MimeMessage(session);

        //Set message attributes
        msg.setFrom(new InternetAddress(from));
        InternetAddress[] address = {new InternetAddress(to)};
        msg.setRecipients(Message.RecipientType.TO, address);
        msg.setSubject("Test E-Mail through Java");
        msg.setSentDate(new Date());

        // Set message content
        msg.setText("This is a test of sending a " +
                    "plain text e-mail through Java.
" +
                    "Here is line 2.");

        //Send the message
        Transport.send(msg);
    }
    catch (MessagingException mex) {
        // Prints all nested (chained) exceptions as well
        mex.printStackTrace();
    }
}
}//End of class

推荐答案

如果您使用的是 EJB 3.0+ 容器，则可以轻松使用计时器服务.