java mail給java.net.connectexception：連接被拒絕

Question

我在Windows上有相同的代碼，並且效果很好。 當我將代碼移至centos時，它給出了異常： javax.mail.MessagingException：無法連接到SMTP主機：stmp.gmail.com，端口：587； 嵌套的異常是：java.net.ConnectException：連接被拒絕

有人可以給我一些關於此異常的建議嗎？

非常感謝你。

Answer 1

您拼寫錯誤！ 它應該是“ smtp .gmail.com”而不是“ stmp .gmail.com”。

Answer 2

“拒絕連接”是兩件事之一。 您指定的host：port不正確，或者介入的防火牆沒有發揮作用。

Answer 3

如果您只是在學習如何通過Java發送郵件，請嘗試以下操作，否則，您需要將其設置為電子郵件提供商的SMTP服務器，然后該SMTP服務器將郵件發送到適當的位置，而情況並非如此此代碼。

注意：該代碼是用Java Servlet編寫的。

---

public class MailClient extends HttpServlet
{
  private class SMTPAuthenticator extends Authenticator
  {
        private PasswordAuthentication authentication;

        public SMTPAuthenticator(String login, String password)
        {
             authentication = new PasswordAuthentication(login, password);
        }

        @Override
        protected PasswordAuthentication getPasswordAuthentication()
        {
             return authentication;
        }
  }

  protected void processRequest(HttpServletRequest request, 
  HttpServletResponse response) throws ServletException, IOException
  {
       response.setContentType("text/html;charset=UTF-8");
       PrintWriter out = response.getWriter();
       try
       {
            String from = "xyz.com";
            String to = "abc.com";
            String subject = "Your Subject.";
            String message = "Message Text.";
            String login = "xyz.com";
            String password = "password";

            Properties props = new Properties();
            props.setProperty("mail.host", "smtp.gmail.com");
            props.setProperty("mail.smtp.port", "587");
            props.setProperty("mail.smtp.auth", "true");
            props.setProperty("mail.smtp.starttls.enable", "true");

            Authenticator auth = new SMTPAuthenticator(login, password);

            Session session = Session.getInstance(props, auth);

            MimeMessage msg = new MimeMessage(session);

           try
           {
                msg.setText(message);
                msg.setSubject(subject);
                msg.setFrom(new InternetAddress(from));
                msg.addRecipient(Message.RecipientType.TO, 
                new InternetAddress(to));
                Transport.send(msg);
           }
           catch (MessagingException ex)
           {
                Logger.getLogger(MailClient.class.getName()).
                log(Level.SEVERE, null, ex);
           }
       } 
       finally
       {
            out.close();
       }
  } 

  @Override
  protected void doGet(HttpServletRequest request, 
  HttpServletResponse response) throws ServletException, IOException
  {
       processRequest(request, response);
  } 

  @Override
  protected void doPost(HttpServletRequest request, 
  HttpServletResponse response)  throws ServletException, IOException
  {
       processRequest(request, response);
  }

  @Override
  public String getServletInfo()
  {
       return "Short description";
  }

}