启用Gmail登录

Question

此代码工作正常，但我只能通过静态邮件jhon.doe@gmail.com发送邮件。是否有启用Gmail登录的解决方案，以便我可以获取用户名和密码来发送邮件？

这是我的代码：

public class EmailSender {
    private static final String SSL_FACTORY = "javax.net.ssl.SSLSocketFactory";

    public static boolean SendEmail(String to, String subject, String msg)
    {
        final String username = "jhon.doe@gmail.com";
        final String password = "abcd12345";
        boolean flag = false;
        Properties props = new Properties();
        props.put("mail.smtp.host", "smtp.gmail.com");
        props.put("mail.smtp.auth", "true");
        props.put("mail.debug", "true");
        props.put("mail.smtp.port", "587");
        props.put("mail.smtp.socketFactory.port", "587");
        props.put("mail.smtp.starttls.enable", "true");
        props.put("mail.smtp.socketFactory.class", SSL_FACTORY);
        props.put("mail.smtp.socketFactory.fallback", "false");
        Session session = Session.getInstance(props, new javax.mail.Authenticator()
        {
            @Override
            protected PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication(username, password);
            }
        });

        try {
            Message message = new MimeMessage(session);
            message.setFrom(new InternetAddress("jhon.doe@gmail.com"));
            message.setRecipients(Message.RecipientType.TO, InternetAddress.parse(to));
            message.setSubject(subject);
            message.setContent(msg, "text/html; charset=utf-8");

            Transport.send(message);
            flag = true;
            System.out.println("Done");
        } catch (MessagingException e) {
            throw new RuntimeException(e);
        }
        return flag;
    }
}

JSF代码页：

            
                         

        <h:outputText value="Message" />
        <br></br>
            <p:inputTextarea rows="10" cols="50" completeMethod="#{inputTextareaView.completeArea}" value="#{faqbean.message}" queryDelay="750" minQueryLength="4" />
        <br></br>

        <p:commandButton action="#{faqbean.send()}" value="Send To Support" ajax="true"/>