java - 无法使用 JavaMail api 连接到 Gmail SMTP

Question

我编写了以下两个java类 -

public class EmailUtil {

    public static void sendEmail(Session session, String toEmail, String subject, String body){
        try
        {
          MimeMessage msg = new MimeMessage(session);
          //set message headers
          msg.addHeader("Content-type", "text/HTML; charset=UTF-8");
          msg.addHeader("format", "flowed");
          msg.addHeader("Content-Transfer-Encoding", "8bit");

          msg.setFrom(new InternetAddress("no_reply@no_reply.com", "NoReply-NP"));

          msg.setReplyTo(InternetAddress.parse("no_reply@no_reply.com", false));

          msg.setSubject(subject, "UTF-8");

          msg.setText(body, "UTF-8");

          msg.setSentDate(new Date());

          msg.setRecipients(Message.RecipientType.TO, InternetAddress.parse(toEmail, false));
          System.out.println("Message is ready");
          Transport.send(msg); 

          System.out.println("EMail Sent Successfully!!");
        }
        catch (Exception e) {
          e.printStackTrace();
        }
    }
}


public class TLSEmail {


    public static void main(String[] args) {
        final String fromEmail = "*****@gmail.com"; 
        final String password = "*****"; 
        final String toEmail = "****@gmail.com"; 

        System.out.println("TLSEmail Start");
        Properties props = new Properties();
        props.put("mail.smtp.host", "smtp.gmail.com"); //SMTP Host
        props.put("mail.smtp.port", "587"); //TLS Port
        props.put("mail.smtp.auth", "true"); //enable authentication
        props.put("mail.smtp.starttls.enable", "true"); //enable STARTTLS

                //create Authenticator object to pass in Session.getInstance argument
        Authenticator auth = new Authenticator() {
            //override the getPasswordAuthentication method
            protected PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication(fromEmail, password);
            }
        };
        Session session = Session.getInstance(props, auth);

        EmailUtil.sendEmail(session, toEmail,"TLSEmail Testing Subject", "TLSEmail Testing Body");

    }


}

当我运行此程序时，出现以下错误 -

javax.mail.MessagingException:无法连接到 SMTP 主机:smtp.gmail.com，端口:587； 嵌套异常是: java.net.SocketException:权限被拒绝:连接

我该如何解决这个问题？请帮忙!PS - 我没有使用两步验证提前致谢!

Answer 1

为了让它发挥作用，我有:

1. 为我的 Gmail 帐户启用了 POP/IMAP。
2. 允许安全性较低的应用通过此网址访问您的帐户: https://www.google.com/settings/security/lesssecureapps .

我希望这对其他人有帮助。