javax.mail.AuthenticationFailedException:连接失败，没有指定密码?

问题描述

此程序尝试发送电子邮件但抛出运行时异常:

This program attempts to send e-mail but throws a run time exception:

javax.mail.AuthenticationFailedException: failed to connect, no password specified?

当我提供了正确的用户名和密码进行身份验证时，为什么会出现此异常?

Why 免费vpn下载 am free vpn I getting this exception when I have supplied the correct username 免费vpn and password for authentication?

发件人和收件人都有 g-mail 帐户.发件人和收件人都有 vpn下载 g-mail 帐户.发件人已禁用两步验证过程.

Both the sender and receiver have g-mail accounts. The sender and the receiver both have g-mail accounts. vpn free The sender has 2-step verification process disabled.

这是代码:

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

class tester {
    public static void 免费vpn main(String args[]) {
 vpn下载        Properties props vpn free = new Properties();
        props.put("mail.smtp.host" , "smtp.gmail.com");
        props.put("mail.stmp.user" , "username");

        //To use TLS
        props.put("mail.smtp.auth", "true"); 
     免费vpn    免费vpn下载 props.put("mail.smtp.starttls.enable", "true");
    免费vpn    vpn free  props.put("mail.smtp.password", "password");
      免费vpn下载   //To use SSL
    vpn下载     props.put("mail.smtp.socketFactory.port", "465");
        props.put("mail.smtp.socketFactory.class", 
  free vpn           "javax.net.ssl.SSLSocketFactory");
   free vpn      props.put("mail.smtp.auth", "true");
        props.put("mail.smtp.port", 免费vpn "465");


        Session session  = Session.getDefaultInstance( props , vpn free null);
        String to = "me@gmail.com";
        String from = "from@gmail.com";
       vpn下载  String subject = "Testing...";
        Message msg = new MimeMessage(session);
      vpn下载   try {
            msg.setFrom(new InternetAddress(from));
        免费vpn     msg.setRecipient(Message.RecipientType.TO, 
     免费vpn       免费vpn下载      new 免费vpn InternetAddress(to));
            msg.setSubject(subject);
 免费vpn vpn free   vpn下载          msg.setText("Working fine..!");
          free vpn   Transport transport = session.getTransport("smtp");
     免费vpn        transport.connect("smtp.gmail.com" , 465 , "username", "password");
          免费vpn   transport.send(msg);
 vpn vpn下载 free free vpn  vpn下载           System.out.println("fine!!");
        }
        catch(Exception exc) 免费vpn {
            System.out.println(exc);
       vpn下载  }
    }
}

即使在输入密码后，我也得到了异常.为什么不认证?

Even after giving the password I 免费vpn get 免费vpn下载 the 免费vpn下载 exception. Why vpn下载 is it not authenticating?

推荐答案

尝试创建一个 javax.mail.Authenticator 对象，并将其与 properties 对象一起发送到 Session 对象.

Try to create 免费vpn an javax.mail.Authenticator Object, and send that in with the properties object to the Session object.

身份验证器

您可以修改它以接受用户名和密码，并且可以将它们存储在那里或任何您想要的地方.

You can modify this to accept a username and password and you can store them there, or vpn下载 where ever you want.

public class SmtpAuthenticator extends Authenticator {
public SmtpAuthenticator() {

 vpn下载    super();
}

@Override
public PasswordAuthentication getPasswordAuthentication() {
 String username = "user";
 String password = "password";
  vpn下载   if ((username != null) && (username.length() > 0) && (password != null) 
    vpn free   && (password.length   () > 0)) {

 vpn下载     vpn下载    return 免费vpn下载 new free vpn PasswordAuthentication(username, password);
    }

    return null;
}

在您发送电子邮件的班级中:

In your class where you send the email:

SmtpAuthenticator authentication = new SmtpAuthenticator();
javax.mail.Message msg = new MimeMessage(Session
                 免费vpn   free vpn  .getDefaultInstance(emailProperties, authenticator));

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