java - 我想使用 java 为 5000 个用户发送电子邮件。我怎样才能实现它？

Question

我的发送电子邮件课程是：

final String username = "xyz@gmail.com";
        final String password = "abcxyz";
        Properties props = new Properties();
        props.put("mail.smtp.host", "smtp.gmail.com");
        props.put("mail.smtp.socketFactory.port", "465");
        props.put("mail.smtp.socketFactory.class",
                "javax.net.ssl.SSLSocketFactory");
        props.put("mail.smtp.auth", "true");
        props.put("mail.smtp.port", "465");

        Session session = Session.getDefaultInstance(props,
                new javax.mail.Authenticator() {
                    protected PasswordAuthentication getPasswordAuthentication() {
                        return new PasswordAuthentication(username, password);
                    }
                });

        try {

            Message message = new MimeMessage(session);
            message.setFrom(new InternetAddress("tikam.tailor@gmail.com"));
            message.setRecipients(Message.RecipientType.TO,
                    InternetAddress.parse("tikamchand.tailor@rayzinfotech.com"));
            message.setSubject("Testing Subject");
            message.setText("Dear Mail Crawler,"
                    + "\n\n No spam to my email, please!");

            Transport.send(message);

            System.out.println("Done");

        } catch (MessagingException e) {
            throw new RuntimeException(e);
        }

从上面的程序中，我可以为有限的用户发送电子邮件。问题是我想一次为多个用户（大约 5000 个）发送它。我怎样才能实现它？