Java通过Gmail发送电子邮件，有时候有时会挂起

Question

我通过Gmail通过我的网络应用发送电子邮件。

但是，有时它工作正常，但有时它只是停止没有任何消息。

有谁知道如何解决这个问题？

在我的春天AppConfig.java

@Bean 
    public JavaMailSender getMailSender(){ 
     JavaMailSenderImpl mailSender = new JavaMailSenderImpl(); 
     mailSender.setHost("smtp.gmail.com"); 
     mailSender.setPort(587); 
     mailSender.setUsername("my email from"); 
     mailSender.setPassword("my email password"); 

     Properties javaMailProperties = new Properties(); 
     javaMailProperties.put("mail.smtp.starttls.enable", "true"); 
     javaMailProperties.put("mail.smtp.auth", "true"); 
     //javaMailProperties.put("mail.transport.protocol", "smtps"); 
     javaMailProperties.put("mail.transport.protocol", "smtp"); 
     javaMailProperties.put("mail.debug", "true"); 

     mailSender.setJavaMailProperties(javaMailProperties); 
     return mailSender; 
    } 

在我mailService.java

public void sendEmailWithTemplate(Activity activity, Object object) { 
     Member member = (Member) object; 

     MimeMessagePreparator verificationEmail = getEmailFromActivity(activity, member); 

     try { 
      mailSender.send(verificationEmail); 
      System.out.println("Message sent............................."); 
     } catch (MailException ex) { 
      System.err.println(ex.getMessage()); 
     } 
    } 

private MimeMessagePreparator getEmailFromActivity(final Activity activity, final Member member) { 

     MimeMessagePreparator preparator = new MimeMessagePreparator() { 

      public void prepare(MimeMessage mimeMessage) throws Exception { 
       MimeMessageHelper helper = new MimeMessageHelper(mimeMessage, true); 

       helper.setSubject(activity.getActivity_subject()); 
       helper.setFrom("my from email"); 
       helper.setTo(member.getEmail()); 

       String mailContent = activity.getActivity_content(); 

       helper.setText(mailContent, true); 


      } 
     }; 
     return preparator; 
    } 

有时它工作正常，我将能够发送邮件，但有时仅仅是停止加在20分钟以上：

DEBUG SMTP: enable SASL 
DEBUG SMTP: useEhlo true, useAuth false 
DEBUG SMTP: trying to connect to host "smtp.gmail.com", port 587, isSSL false 

Answer 1

这是我从其他帖子得到的方法，但我不能回头看p OST。 活动是我的一个存储主题和内容的对象。

public void sendEmailWithActivity(Activity activity, Object object, String path) { 
     try { 
      Member member = (Member) object; 
      String host = "smtp.gmail.com"; 
      String username = "email"; 
      String password = "password"; 
      String body = activity.getActivity_content(); 
      String name = activity.getActivity_name(); 
      String subject = activity.getActivity_subject();= 


      //Set the properties 
      Properties props = new Properties(); 
      props.put("mail.smtps.auth", "true"); 
      // Set the session here 
      Session session = Session.getDefaultInstance(props); 
      MimeMessage msg = new MimeMessage(session); 
      // set the message content here 
      msg.setSubject(subject); 
      msg.setContent(body, "text/html"); 
      msg.setFrom(new InternetAddress(username)); 
      msg.addRecipient(Message.RecipientType.TO, 
        new InternetAddress(member.getEmail())); 
      Transport t = session.getTransport("smtps"); 

      t.connect(host, username, password); 
      t.sendMessage(msg, msg.getAllRecipients()); 
      t.close(); 
     } catch (Exception e) { 
      e.printStackTrace(); 
     } finally { 

     } 

    }