无法使用Java代码

Question

package abc; 

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

public class SendMail { 

    public static void main(String[] args) { 
     // TODO Auto-generated method stub 
     String to="to@gmail.com"; 
     String from="from@gmail.com"; 
     final String username="from"; 
     final String password="password"; 
     Properties properties=new Properties(); 
     properties.put("mail.smtp.host", "smtp.gmail.com"); 
     properties.put("mail.smtp.auth", "true"); 
     properties.put("mail.smtp.starttls.enable", "true"); 
     properties.put("mail.smtp.port", "587"); 

     Session session=Session.getInstance(properties, 
       new javax.mail.Authenticator(){ 
      protected PasswordAuthentication getPasswordAuthentication(){ 
       return new PasswordAuthentication(username, password); 
      } 
     } 
       ); 

     try{ 
      Message message=new MimeMessage(session); 
      message.setFrom(new InternetAddress(from)); 
      message.setRecipients(Message.RecipientType.TO, InternetAddress.parse(to)); 
      message.setSubject("Test Mail"); 
      message.setText("Hey I wrote a java code to send mail. Thanks "); 
      Transport.send(message); 
      System.out.println("Sent Mail :)"); 
     }  
     catch(MessagingException e){ 
      e.printStackTrace(); 
     } 

    } 

} 

从Gmail发送邮件，我得到了以下errror whene我试图运行上面的代码::

javax.mail.AuthenticationFailedException: 534-5.7.14 <https://accounts.google.com/ContinueSignIn?sarp=1&scc=1&plt=AKgnsbvHc 
534-5.7.14 gCjfbim5WYCDTQee6sZlZ2d31nncueOizOcz9NieexN5nSlGr0c49lSZ43qc4RQPQvpWLH 
534-5.7.14 qCUQUecjIR7qxdYJ5R_WgLxkzD9u4Ds3EEG7ceSMyTZg0dpSGJb-zl5C82YDTdLOYTX5Pl 
534-5.7.14 tmEfWrmktFCdAxUjtDiPNruDLqhPSIZ9dd187tQjBtOw2X8zx7MUcysN9BRawwDmbXT6mJ 
534-5.7.14 cLn_sJS5UBuqommn0uJK7W1tPZzU> 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 qy7sm48619995pab.34 - gsmtp 

    at com.sun.mail.smtp.SMTPTransport$Authenticator.authenticate(SMTPTransport.java:648) 
    at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:583) 
    at javax.mail.Service.connect(Service.java:313) 
    at javax.mail.Service.connect(Service.java:172) 
    at javax.mail.Service.connect(Service.java:121) 
    at javax.mail.Transport.send0(Transport.java:190) 
    at javax.mail.Transport.send(Transport.java:120) 
    at abc.SendMail.main(SendMail.java:36) 

Gmail没有让这个代码。我甚至收到了一封来自gmail的关于可疑登录信息的邮件，并回顾了我运行此代码的地方。解决办法是什么 ？

Answer 1

它是AuthenticationFailedException，你应该使用真正的用户名和密码组合，以使程序工作，并应该访问您的程序登录到下面详细解释的gmail。

而且你也应该检查这一点，以便访问你的程序发送邮件，整个答案在堆栈跟踪中给出的链接;

https://support.google.com/mail/answer/78754

你必须做的是（如上面的链接解释）;

1. 授予您的用户访问权限;

https://accounts.google.com/DisplayUnlockCaptcha

给访问安全性较低的登录;

https://www.google.com/settings/security/lesssecureapps

此后，如果再次尝试运行与有效参数你的代码，测试邮件将被发送。