java - 如何解决 javax.mail.AuthenticationFailedException

Question

我已经看过这个问题的所有答案。但我的邮件没有发送。实际上，当我使谷歌安全性降低时它会发送。但对我来说这不是一个解决方案!因为它使 Gmail 帐户不 protected ，所以使用该应用程序的人也不想确保他们的邮件安全。所以我尝试了所有建议的变体并阅读了 Java Mail FAQ。这是代码。如果有真正的解决方案，请帮助我。但请不要建议更改谷歌安全!我需要不需要应用用户执行任何操作的解决方案。

public class Mail  {

    public Mail() {
        _host = "smtp.gmail.com"; // default smtp server
        _port = "587"; // default smtp port587

        _user = "myname@gmail.com"; // username
        _pass = "password"; // password
        _from = "myname@gmail.com"; // email sent from
        _to = {"yourname@gmail.com"};
        _subject = "go"; // email subject
        _body = "mail"; // email body

        _debuggable = true; // debug mode on or off - default off
        _auth = true; // smtp authentication - default on

        _multipart = new MimeMultipart();

        // There is something wrong with MailCap, javamail can not find a handler for the multipart/mixed part, so this bit needs to be added.
        MailcapCommandMap mc = (MailcapCommandMap) CommandMap.getDefaultCommandMap();
        mc.addMailcap("text/html;; x-java-content-handler=com.sun.mail.handlers.text_html");
        mc.addMailcap("text/xml;; x-java-content-handler=com.sun.mail.handlers.text_xml");
        mc.addMailcap("text/plain;; x-java-content-handler=com.sun.mail.handlers.text_plain");
        mc.addMailcap("multipart/*;; x-java-content-handler=com.sun.mail.handlers.multipart_mixed");
        mc.addMailcap("message/rfc822;; x-java-content-handler=com.sun.mail.handlers.message_rfc822");
        CommandMap.setDefaultCommandMap(mc);
    }

    public Mail(String user, String pass) {
        this();

        _user = user;
        _pass = pass;
    }

    public boolean send() throws Exception {
        Properties props = _setProperties();

        if(!_user.equals("") && !_pass.equals("") && _to.length > 0 && !_from.equals("") && !_subject.equals("") && !_body.equals("")) {

           Session session = Session.getInstance(props, new GMailAuthenticator(_user,_pass));

            MimeMessage msg = new MimeMessage(session);

            msg.setFrom(new InternetAddress(_from));

            InternetAddress[] addressTo = new InternetAddress[_to.length];
            for (int i = 0; i < _to.length; i++) {
                addressTo[i] = new InternetAddress(_to[i]);
            }
            msg.setRecipients(MimeMessage.RecipientType.TO, addressTo);
            msg.setSubject(_subject);
            msg.setSentDate(new Date());

            // setup message body
            BodyPart messageBodyPart = new MimeBodyPart();
            messageBodyPart.setText(_body);
            _multipart.addBodyPart(messageBodyPart);

            // Put parts in message
            msg.setContent(_multipart);

            // send email

            Transport t = session.getTransport("smtp");
            try {
                t.connect(_host, _user, _pass);
               t.sendMessage(msg, msg.getAllRecipients());

            } finally {
                t.close();
            }


            return true;
        } else {
            return false;
        }
    }

    private Properties _setProperties() {
        Properties props = new Properties();

        props.put("mail.smtp.host", _host);

        if(_debuggable) {
            props.put("mail.debug", "true");
        }

        if(_auth) {
            props.put("mail.smtp.auth", "true");
        }

        props.put("mail.smtp.port", _port);
        props.put("mail.smtp.starttls.enable", "true");
        props.put("mail.debug", "true");

        return props;
    }


    // class for secure access gmail

    class GMailAuthenticator extends Authenticator {
        String user;
        String pw;
        public GMailAuthenticator (String username, String password)
        {
            super();
            this.user = username;
            this.pw = password;
        }

        public PasswordAuthentication getPasswordAuthentication()
        {
            return new PasswordAuthentication(user, pw);
        }
    }

以及我在 Activity 中调用的方法 send()

final Button send = (Button) this.findViewById(R.id.send);
send.setOnClickListener(new View.OnClickListener() {

    public void onClick(View v) {
        // TODO Auto-generated method stub

       new SendClass().execute();

}
});

private class SendClass extends AsyncTask{

    @Override
    protected Object doInBackground(Object[] objects) {
        Mail m = new Mail();

        m.send();
        return null;
    }
}

Answer 1

我假设您正在尝试使用 OAuth2，尽管您的代码中没有任何内容表明这一点。这是避免将您的帐户配置为“安全性较低的应用程序”的唯一方法。使用OAuth2要复杂得多，this JavaMail web page将帮助您开始。