使用java邮件api发送电子邮件失败

绝望地试图给自己发送电子邮件：

import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import java.util.Properties;

Properties props = new Properties();
    props.put("mail.smtp.host", "smtp.web.de");
    props.put("mail.smtp.auth", "true");
    props.put("mail.smtp.starttls.enable", "true");

    Session session = Session.getInstance(props);

    Message msg = new MimeMessage(session);
    try {
        msg.setFrom(new InternetAddress("myveryownemail@web.de"));
        msg.setRecipients(Message.RecipientType.TO, new InternetAddress[]{new InternetAddress("myveryownemail@web.de")});
        msg.setSubject("whatever");
        msg.setContent("whatever", "text/plain");

        Transport transport = session.getTransport("smtp");
        transport.connect("smtp.web.de", 587, "myveryownemail", "myveryownandcorrectpassword");

        Transport.send(msg);
    } catch (MessagingException e) {
        e.printStackTrace();
    }

我得到了
javax.mail.AuthenticationFailedException:连接失败，未指定密码？
但是用户名和密码是绝对正确的（试过用户名有@web.de和没有@web.de）。密码是我正常登录邮件帐户时使用的密码。

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不要获取它

使用smtp用户和密码设置以下属性

props.put("mail.smtp.user", "myuser");
props.put("mail.smtp.password", "mypwd");

参考：

使用您的用户名和密码创建如下javax.mail.Session对象 密码：-

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参考教程：-

在过去，我解决了类似的问题，添加了以下内容：

if ("true".equals(emailConfig.get("mail.smtp.auth"))) {
    session = Session.getInstance(properties, new javax.mail.Authenticator() {
        protected PasswordAuthentication getPasswordAuthentication() {
            return new PasswordAuthentication(emailConfig.get("mail.smtp.user"), emailConfig.get("mail.smtp.password"));
        }
    });
}

Message msg = new MimeMessage(session);
msg.setFrom(new InternetAddress(emailFromAddress));
msg.setRecipient(Message.RecipientType.TO, new InternetAddress(emailToAdrress));
msg.setSubject(mailSubject);
msg.setText(mailMessageBody);
Transport.send(msg);

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会话是javax.mail.Session

希望您的项目中包含了“mail.jar”和“activation.jar”。这可能有助于您调用Transport.send静态方法，该方法将忽略您创建并连接的传输实例。改为调用sendMessage方法，或者跳过创建自己的传输实例，并调用接受用户名和密码的静态send方法

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这是其中一个。我已经试过了。我试了很多。很多根据教程。什么都不管用，然后像阿米特提到的那样试试

Session Session=Session.getInstance（props，new javax.mail.Authenticator（）{protected PasswordAuthentication getPasswordAuthentication（）{return new PasswordAuthentication（username，password）；}}）有。也没有mail.smtp.password属性。
if ("true".equals(emailConfig.get("mail.smtp.auth"))) {
    session = Session.getInstance(properties, new javax.mail.Authenticator() {
        protected PasswordAuthentication getPasswordAuthentication() {
            return new PasswordAuthentication(emailConfig.get("mail.smtp.user"), emailConfig.get("mail.smtp.password"));
        }
    });
}

Message msg = new MimeMessage(session);
msg.setFrom(new InternetAddress(emailFromAddress));
msg.setRecipient(Message.RecipientType.TO, new InternetAddress(emailToAdrress));
msg.setSubject(mailSubject);
msg.setText(mailMessageBody);
Transport.send(msg);