Question

我想从非英文电子邮件ID（例如डेमो@डेमो.कॉम）发送电子邮件至任何电子邮件ID 使用java。

当我使用时：

String to = "demo@gmail.com";
 String from = "डेमो@डेमो.कॉम";

      String host = "localhost";

      Properties properties = System.getProperties();
          properties.setProperty("mail.smtp.host", host);

      Session session = Session.getDefaultInstance(properties);

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

         message.setFrom(new InternetAddress(from));


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

         message.setSubject("This is the Subject Line!");

         // Now set the actual message
         message.setText("This is actual message");

         Transport.send(message);
         System.out.println("Sent message successfully....");
      }catch (MessagingException mex) {
         mex.printStackTrace();
      }

它抛出异常，如：

javax.mail.SendFailedException: Sending failed;
  nested exception is:
    class javax.mail.MessagingException: 501 Syntax error in parameters or arguments

    at javax.mail.Transport.send0(Transport.java:218)
    at javax.mail.Transport.send(Transport.java:80)
    at com.data.TestingSendMail.main(TestingSendMail.java:49)

请告诉我我需要做些什么。

Answer 1

您应该做的是添加编码格式：

String to = "demo@gmail.com";
String from = "डेमो@डेमो.कॉम";

String host = "localhost";

Properties properties = System.getProperties();
    properties.setProperty("mail.smtp.host", host);

Session session = Session.getDefaultInstance(properties);

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

   message.setFrom(new InternetAddress(from));


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

   message.setSubject("This is the Subject Line!");

   message.setText("This is actual message","UTF-8");

   Transport.send(message);
   System.out.println("Sent message successfully....");
}catch (MessagingException mex) {
   mex.printStackTrace();
}

当您在.setText方法中设置编码时，您也会告诉标头编码。

Answer 2

首先，你需要一个完整的地址（包括域名部分）。如果您的域还包含国际字符，则需要进行转换使用java.net.IDN.toASCII这样的Punycode：

String[] emailSplit = from.split("@");
String local = emailSplit[0];
String domain = emailSplit[1];
String punycodeDomain = java.net.IDN.toASCII(domain);
String newEmail = local + "@" + punycodeDomain;

（简化版，需要进行一些错误检查）

如何在Java中发送包含非英语发件人ID的电子邮件？

2 个答案: