Java 为什么我的电子邮件会话方法停止工作？

Question

我正在使用我的一个旧项目中的 class/method 以编程方式发送电子邮件。它在当时有效，但现在我遇到了一些错误，这些错误可以避免某种 gmail 安全更新，因为我上次在旧的 project:I 中使用这个 class 尝试通过浏览器登录和注销，但是没有帮助。

堆栈跟踪显示：

javax.mail.AuthenticationFailedException: 534-5.7.14 <https://accounts.google.com/signin/continue?sarp=1&scc=1&plt=AKgnsbs6
534-5.7.14 ZJAPOThluIgJLcM06Bo2G599ldMO1V8IpReZebE8FvDK3uj4KCgtg7CBEUzfjv1ZRjKTY8
534-5.7.14 TnV7OuzgZSBLFq4N89fwfDcYSs1fnsyWLglDAEWbfbltw9eN5aXc0_S_7g8kw0EhLs7IDO
534-5.7.14 mEsQ-FBS3EBd_F78Qv3iOpGeSACqreH_42BZ8XnouZBwfNp02PqLVqcv7wBF_-0YdtXLx4
534-5.7.14 DZb0An9hZCoogawn1j79heQGK4g9w> Please log in via your web browser and
534-5.7.14 then try again.
534-5.7.14  Learn more at
534 5.7.14  https://support.google.com/mail/answer/78754 s59sm4398674qtd.20 - gsmtp

at com.sun.mail.smtp.SMTPTransport$Authenticator.authenticate(SMTPTransport.java:893)
at com.sun.mail.smtp.SMTPTransport.authenticate(SMTPTransport.java:814)
at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:728)
at javax.mail.Service.connect(Service.java:364)
at javax.mail.Service.connect(Service.java:245)
at javax.mail.Service.connect(Service.java:265)
at javax.mail.Transport.send0(Transport.java:251)
at javax.mail.Transport.send(Transport.java:174)
at Emailer.sendEmail(NotificationHandler.java:70)`
.
.
.

这是我的代码

class Emailer  {

   private static String host = "smtp.gmail.com";
   private static String user = "myaccount@gmail.com";
   private static String pass = "mypassword";

   public static void sendEmail(String fromAddr, String toAddr, String subject, String body) {
       Properties props = new Properties();
       props.put("mail.smtp.auth", "true");
       props.put("mail.smtp.starttls.enable", "true");
       props.put("mail.smtp.host", "smtp.gmail.com");
       props.put("mail.smtp.port", "587");
       Session session = Session.getInstance(props, null);

       MimeMessage message = new MimeMessage(session);

       try {
           message.setFrom(new InternetAddress(fromAddr));
           message.setRecipients(Message.RecipientType.TO, InternetAddress.parse(toAddr));
           message.setSubject(subject);
           message.setText(body);
           Transport.send(message, user, pass);
       }

       catch (AddressException e) {
          e.printStackTrace();
       }

       catch (MessagingException e) {
          e.printStackTrace();
       }
}

Answer 1

可能是因为 google 阻止了您的电子邮件客户端。

Google may block sign-in attempts from some apps or devices that do not use modern security standards. Since these apps and devices are easier to break into, blocking them helps keep your account safe.

我运行大约两个月前遇到这个问题，我的 Java 应用程序无法使用测试 Gmail 帐户发送电子邮件。这个link解释的不多。但它确实提供了禁用此功能的步骤。

Java 为什么我的电子邮件会话方法停止工作？

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