java - 尝试使用 gmail 在 Java 中发送电子邮件总是导致用户名和密码不被接受

Question

当我调用发送方法时(在设置 studentAddress 之后)，我得到这个:

javax.mail.AuthenticationFailedException: 535-5.7.1 Username and Password not accepted. Learn more at<br/>
535 5.7.1 http://mail.google.com/support/bin/answer.py?answer=14257 y15sm906936wfd.10

我非常确定代码是正确的，并且 100% 肯定我输入的用户名和密码详细信息是正确的。那么这是 gmail 有问题还是什么？

这是我的代码:

import java.util.*;
import javax.mail.*;
import javax.mail.internet.*;

public class SendEmail {

    private String host = "smtp.gmail.com";
    private String emailLogin = "xxx@gmail.com";
    private String pass = "xxx";
    private String studentAddress;
    private String to;
    private Properties props = System.getProperties();

    public SendEmail() {
        props.put("mail.smtps.auth", "true");
        props.put("mail.smtps.starttls.enable", "true");
        props.put("mail.smtp.host", host);
        props.put("mail.smtp.user", emailLogin);
        props.put("mail.smtp.password", pass);
        props.put("mail.smtp.port", "587");
        to = "xxx@gmail.com";
    }

    public void setStudentAddress(String newAddress) {
        studentAddress = newAddress;
    }

    public void send() {
        Session session = Session.getDefaultInstance(props, null);
        MimeMessage message = new MimeMessage(session);
        try {
            message.setFrom(new InternetAddress(emailLogin));

            InternetAddress[] studentAddressList = {new InternetAddress(studentAddress)};
            message.setReplyTo(studentAddressList);
            message.setRecipient(Message.RecipientType.TO, new InternetAddress(to));
            message.setSubject("Test Email");
            message.setText("This is a test email!");
            Transport transport = session.getTransport("smtps");
            transport.connect(host, emailLogin, pass);
            transport.sendMessage(message, message.getAllRecipients());
            transport.close();
        } catch (MessagingException me) {
            System.out.println("There has been an email error!");
            me.printStackTrace();           
        }
    }

}

任何想法...

Answer 1

有两种解决方法:

您可以通过链接生成应用程序专用密码，即“https://accounts.google.com/IssuedAuthSubTokens”和使用生成的应用程序专用密码代替您的原始密码.我已经完成了这个及其工作

或

出现异常(javax.mail.AuthenticationFailedException:535-5.7.1 需要特定应用程序密码)的原因是您可能已经激活了 gmail 帐户的两步验证。如果您使用未激活两步验证的帐户，则可以使用原始密码发送电子邮件。我也试过这个并且工作正常。