通过gmail smtp服务器通过java发送邮件时发生java.net.SocketException

Question

我正试图通过gmailSMTP服务器通过java代码发送邮件，但面临java.net.SocketException：连接重置

以下是发送邮件的代码:-`

  Properties props = new Properties();
  props.put("mail.smtp.host",host);  //host is smtp.gmail.com
  if(host.equalsIgnoreCase("smtp.gmail.com"))
  {
      props.put("mail.smtp.socketFactory.port",port);
      props.put("mail.smtp.socketFactory.class",
              "javax.net.ssl.SSLSocketFactory");
      props.put("mail.smtp.auth", "true");
      props.put("mail.smtp.port",port);//port is 465

  }
  else
  {
      props.put("mail.smtp.auth", "true");
  }
  Session session = Session.getDefaultInstance(props,
          new javax.mail.Authenticator() {
      protected PasswordAuthentication getPasswordAuthentication() {
          return new PasswordAuthentication(uname,pwd);
      }
  });

      try {

          session.setDebug(true);
          MimeMessage message = new MimeMessage(session);

          message.setFrom(new InternetAddress(uname));

          message.addRecipient(Message.RecipientType.TO,new InternetAddress(toMail));

          message.setSubject(NewFolderName);
          System.out.println("Composing message body.");

          StringBuilder htmlStreamBuilder = new StringBuilder();
          // we create some html string here.....
          Multipart multipart = new MimeMultipart();

          MimeBodyPart htmlPart = new MimeBodyPart();
          MimeBodyPart attachmentPart= new MimeBodyPart();              

          DataSource source = new FileDataSource(filename);
          attachmentPart.setDataHandler(new DataHandler(source));
          attachmentPart.setFileName(KMAConstants.TESTNG_ATTACHMENT_FILE);

          htmlPart.setContent(htmlStream, "text/html; charset=utf-8");//we give some html stream here ....


          multipart.addBodyPart(htmlPart);
          multipart.addBodyPart(attachmentPart);


          message.setContent(multipart);

          Transport.send(message);



      } catch (MessagingException e)
      {

          System.out.println("Issue in message sending, MessagingExceptionn raised.");
          e.printStackTrace();

          throw e;
      }
  }

  `

`

这里需要注意的重要一点是，这段代码可以在某些计算机上工作。

请帮我一下，提前谢谢。

Answer 1

网络策略阻止了对SMTP服务器的请求。我联系了网络管理员，他给了我所需的权限。现在一切正常。