JavaMail smtp属性（适用于STARTTLS） [英] JavaMail smtp properties (for STARTTLS)

问题描述

JavaMail指定了一组可以设置为配置SMTP连接的属性。要使用STARTTLS，必须设置以下属性

JavaMail specifies a bunch of properties that can be set to configure an SMTP connection. To use STARTTLS it is necessary to set the following property

mail.smtp.starttls.enable=true

我在哪里指定使用smtp服务的用户名/密码？是否足以指定：

Where do I specify the username/password to use the smtp service? Is it enough to specify the:

mail.smtp.user=me
mail.smtp.password=secret

或者我必须使用以下方式明确登录：

Or do I have to explicitely login using the:

transport.connect(server, userName, password)

是的，我已经尝试过这样做，似乎有必要使用transport.connect（..）进行连接。但如果是的话，mail.smtp.user&是什么？传递属性？他们还不足以使用smtp和starttls吗？

Yes, I already tried to do this and it seems that it is necessary to connect using transport.connect(..). But if yes, what are the mail.smtp.user & pass properties for? Are they not enough to use smtp with starttls?

推荐答案

这是我的sendEmail方法，它使用带有STARTTLS的GMail smtp（JavaMail）

Here is my sendEmail method which is using GMail smtp (JavaMail) with STARTTLS

public void sendEmail(String body, String subject, String recipient) throws MessagingException,
            UnsupportedEncodingException {
        Properties mailProps = new Properties();
        mailProps.put("mail.smtp.from", from);
        mailProps.put("mail.smtp.host", smtpHost);
        mailProps.put("mail.smtp.port", port);
        mailProps.put("mail.smtp.auth", true);
        mailProps.put("mail.smtp.socketFactory.port", port);
        mailProps.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
        mailProps.put("mail.smtp.socketFactory.fallback", "false");
        mailProps.put("mail.smtp.starttls.enable", "true");

        Session mailSession = Session.getDefaultInstance(mailProps, new Authenticator() {

            @Override
            protected PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication(login, password);
            }

        });

        MimeMessage message = new MimeMessage(mailSession);
        message.setFrom(new InternetAddress(from));
        String[] emails = { recipient };
        InternetAddress dests[] = new InternetAddress[emails.length];
        for (int i = 0; i < emails.length; i++) {
            dests[i] = new InternetAddress(emails[i].trim().toLowerCase());
        }
        message.setRecipients(Message.RecipientType.TO, dests);
        message.setSubject(subject, "UTF-8");
        Multipart mp = new MimeMultipart();
        MimeBodyPart mbp = new MimeBodyPart();
        mbp.setContent(body, "text/html;charset=utf-8");
        mp.addBodyPart(mbp);
        message.setContent(mp);
        message.setSentDate(new java.util.Date());

        Transport.send(message);
    }

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