如何使用 Gmail 服务器使用 java.mail 从 Web 服务器发送电子邮件

Question

我正在尝试使用 javax.mail 使用 gmail smtp 发送电子邮件。以下是我的代码

 public static void send(String from,String password,String to,String sub,String msg){  
      //Get properties object    
      Properties props = new Properties();    
      props.put("mail.smtp.host", "smtp.gmail.com");    
      props.put("mail.smtp.socketFactory.port", "465");    
      props.put("mail.smtp.socketFactory.class",    
                "javax.net.ssl.SSLSocketFactory");    
      props.put("mail.smtp.auth", "true");    
      props.put("mail.smtp.port", "465");    
      //get Session   
      Session session = Session.getDefaultInstance(props,    
       new javax.mail.Authenticator() {    
       protected PasswordAuthentication getPasswordAuthentication() {    
       return new PasswordAuthentication(from,password);  
       }    
      });    
      //compose message    
      try {    
       MimeMessage message = new MimeMessage(session);    
       message.addRecipient(Message.RecipientType.TO,new InternetAddress(to));    
       message.setSubject(sub);    
       message.setText(msg);    
       //send message  
       Transport.send(message);    
       System.out.println("message sent successfully");    
      } catch (MessagingException e) {throw new RuntimeException(e);}    

}  

代码运行良好当我在本地服务器上运行它但是当我尝试在 Elastic beanstalk 上运行它（我的服务器在 AWS EBS 上运行）时，身份验证失败异常即将到来 注意：我已经从 Google A/c Setting 开启了对不太安全的应用程序的访问，但我仍然收到此错误

javax.mail.AuthenticationFailedException: 534-5.7.14 请通过您的网络浏览器登录，然后重试。 534-5.7.14 了解更多信息 534 5.7.14 https://support.google.com/mail/answer/78754l13sm3053341iti.6 - gsmtp

Answer 1

我最近遇到了同样的问题，我发现问题是 EC2 区域的。谷歌不允许从用户的非经常位置登录不太安全的应用程序。您要么使用 Google Mail API，要么使用其他一些邮件平台，例如 Yahoo。检查您的 EC2 实例区域。尝试使用 yahoo 邮件跟踪代码，将其部署在 Elastic beanstalk 或您使用的任何环境中。这对我有用。

public void yahooSend(String mail,String subject,String msg) {

        // Sender's email ID needs to be mentioned
         String from = "YOUR_YAHOO_MAIL";
         String pass ="YOUR_YAHOO_PASSWORD";
        // Recipient's email ID needs to be mentioned.
       String to = mail;
       String host = "smtp.mail.yahoo.com";

       // Get system properties
       Properties properties = System.getProperties();
       // Setup mail server
       properties.put("mail.smtp.starttls.enable", "true");
       properties.put("mail.smtp.host", host);
       properties.put("mail.smtp.user", from);
       properties.put("mail.smtp.password", pass);
      // props.put("mail.smtp.user", "YAHOO_USER_NAME"); 
       properties.put("mail.smtp.port", "587");
       properties.put("mail.smtp.auth", "true");


       // Get the default Session object.
       Session session = Session.getDefaultInstance(properties);

       try{
          // Create a default MimeMessage object.
          MimeMessage message = new MimeMessage(session);

          // Set From: header field of the header.
          message.setFrom(new InternetAddress(from));

          // Set To: header field of the header.
          message.addRecipient(Message.RecipientType.TO,
                                   new InternetAddress(to));

          // Set Subject: header field
          message.setSubject(subject);

          // Now set the actual message
          message.setText(msg);
          System.out.print("Sending msg "+msg);
          // Send message
          Transport transport = session.getTransport("smtp");
          transport.connect(host,587, from, pass);
          transport.sendMessage(message, message.getAllRecipients());
          transport.close();
         System. out.println("Sent message successfully....");
       }catch (MessagingException mex) {
           System. out.print(mex);
          mex.printStackTrace();
       }
 }

Answer 2

请试试这个

public static void sendPDFReportByGMail(String from, String pass, String to, String subject, String body) {
    Properties props = System.getProperties();
    String host = "smtp.gmail.com";
    props.put("mail.smtp.starttls.enable", "true");
    props.put("mail.smtp.host", host);
    props.put("mail.smtp.user", from);
    props.put("mail.smtp.password", pass);
    props.put("mail.smtp.port", "587");
    props.put("mail.smtp.auth", "true");

    Session session = Session.getInstance(props, new javax.mail.Authenticator() {
        protected PasswordAuthentication getPasswordAuthentication() {
            return new PasswordAuthentication(from, pass);
        }
    });

    MimeMessage message = new MimeMessage(session);

    try {
        // Set from address
        message.setFrom(new InternetAddress(from));
        message.addRecipient(Message.RecipientType.TO, new InternetAddress(to));
        // Set subject
        message.setSubject(subject);
        // Set Mail body
        message.setText(body);

        BodyPart objMessageBodyPart = new MimeBodyPart();

        objMessageBodyPart.setText(body);

        Transport transport = session.getTransport("smtp");
        transport.connect(host, from, pass);
        transport.sendMessage(message, message.getAllRecipients());
        transport.close();
    } catch (AddressException ae) {
        ae.printStackTrace();
    } catch (MessagingException me) {
        me.printStackTrace();
    }
}