無法連接到SMTP主機：smtp.gmail.com端口：465，響應：-1

Question

在發送電子郵件我得到這個錯誤

java.lang.RuntimeException: javax.mail.SendFailedException: Sending failed; nested exception is: class javax.mail.MessagingException: Could not connect to SMTP host: smtp.gmail.com, port: 465, response: -1

我的代碼是：

Properties props = new Properties(); 
props.put("mail.smtp.host", "smtp.gmail.com"); 
props.put("mail.smtp.starttls.enable","true"); 
props.put("mail.smtp.socketFactory.port", "465"); 
props.put("mail.smtp.auth", "true"); 
props.put("mail.smtp.port", "465"); 

Session session = Session.getDefaultInstance(props, 
     new javax.mail.Authenticator() { 
       protected PasswordAuthentication getPasswordAuthentication() { 
         return new PasswordAuthentication("email","password"); 
       } 
     }); 

try { 

     Message message = new MimeMessage(session); 
     message.setFrom(new InternetAddress("email")); 
     message.setRecipients(Message.RecipientType.TO, 
         InternetAddress.parse(this.to)); 
     message.setSubject("Testing"); 
     message.setText("Hey, this is the testing email."); 



     Transport.send(message); 

任何幫助，將不勝感激。

在此先感謝。

Answer 1

端口465是「smtp over SSL」。

http://javamail.kenai.com/nonav/javadocs/com/sun/mail/smtp/package-summary.html

[...] For example, use 
    props.put("mail.smtp.port", "888"); 
to set the mail.smtp.port property, which is of type int. 

Note that if you're using the "smtps" protocol to access SMTP over SSL, 
all the properties would be named "mail.smtps.*" 

Answer 2

你需要告訴它你使用SSL：

props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory"); 

如果你錯過了什麼，這裏是工作代碼：

String d_email = "address@gmail.com", 
      d_uname = "Name", 
      d_password = "urpassword", 
      d_host = "smtp.gmail.com", 
      d_port = "465", 
      m_to = "toAddress@gmail.com", 
      m_subject = "Indoors Readable File: " + params[0].getName(), 
      m_text = "This message is from Indoor Positioning App. Required file(s) are attached."; 
    Properties props = new Properties(); 
    props.put("mail.smtp.user", d_email); 
    props.put("mail.smtp.host", d_host); 
    props.put("mail.smtp.port", d_port); 
    props.put("mail.smtp.starttls.enable","true"); 
    props.put("mail.smtp.debug", "true"); 
    props.put("mail.smtp.auth", "true"); 
    props.put("mail.smtp.socketFactory.port", d_port); 
    props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory"); 
    props.put("mail.smtp.socketFactory.fallback", "false"); 

    SMTPAuthenticator auth = new SMTPAuthenticator(); 
    Session session = Session.getInstance(props, auth); 
    session.setDebug(true); 

    MimeMessage msg = new MimeMessage(session); 
    try { 
     msg.setSubject(m_subject); 
     msg.setFrom(new InternetAddress(d_email)); 
     msg.addRecipient(Message.RecipientType.TO, new InternetAddress(m_to)); 

Transport transport = session.getTransport("smtps"); 
      transport.connect(d_host, Integer.valueOf(d_port), d_uname, d_password); 
      transport.sendMessage(msg, msg.getAllRecipients()); 
      transport.close(); 

     } catch (AddressException e) { 
      e.printStackTrace(); 
      return false; 
     } catch (MessagingException e) { 
      e.printStackTrace(); 
      return false; 
     } 

Answer 3

我有在使用NetBeans進行調試時遇到此問題，甚至執行實際的jar文件。防病毒會阻止發送電子郵件。您應該在調試期間臨時禁用您的防病毒軟件，或者排除NetBeans和實際的jar文件被掃描。就我而言，我正在使用Avast。

參見如何排除此鏈接：How to Add File/Website Exception into avast! Antivirus 2014

這對我的作品。

Answer 4

我做什麼我註釋掉

props.put("mail.smtp.starttls.enable","true"); 

因爲顯然是G-郵件，你並不需要它。如果你還沒有這樣做，你需要在你的程序的G-mail中創建一個應用程序密碼。我做到了這一點，它的工作完美。這裏的這個鏈接會告訴你如何：https://support.google.com/accounts/answer/185833。