Question

我有以下方法发送电子邮件，但我无法获取附加的对象，为什么？

  void Send_Email(String From,String To,String Subject,Text Message_Text,Contact_Info_Entry An_Info_Entry)
  {
    Properties props=new Properties();
    Session session=Session.getDefaultInstance(props,null);
    String htmlBody="<Html>Hi</Html>";
    byte[] attachmentData;
    Multipart multipart=new MimeMultipart();
    BASE64Encoder BASE64_Encoder=new BASE64Encoder();
    try
    {
      Message message=new MimeMessage(session);
      message.setFrom(new InternetAddress(From,"NM-Java Admin"));
      message.addRecipient(Message.RecipientType.TO,new InternetAddress(To,"Ni , Min"));
      // You may need to encode the subject with this special method !
      // message.setSubject(javax.mail.internet.MimeUtility.encodeText("Testing javamail with french : ï¿½ï¿½ï¿½ "));
      message.setSentDate(new Date());
      message.setSubject(Subject);

      MimeBodyPart messageBodyPart=new MimeBodyPart();                         // Create the message part
      messageBodyPart.setText(Message_Text.getValue());                        // Fill message
      multipart.addBodyPart(messageBodyPart);

      MimeBodyPart htmlPart=new MimeBodyPart();
      htmlPart.setContent(htmlBody,"text/html");
      multipart.addBodyPart(htmlPart);
//setHTMLContent(message);

      ByteArrayOutputStream bStream=new ByteArrayOutputStream();
      ObjectOutputStream oStream=new ObjectOutputStream(bStream);
      oStream.writeObject(An_Info_Entry);
//      attachmentData=bStream.toByteArray();
//      attachmentData=BASE64_Encoder.encode(bStream.toByteArray());

      MimeBodyPart attachment=new MimeBodyPart();
      attachment.setFileName(An_Info_Entry.Contact_Id);
      attachment.setContent(BASE64_Encoder.encode(bStream.toByteArray()),"application/x-java-serialized-object");
      multipart.addBodyPart(attachment);

      setBinaryContent(message,BASE64_Encoder.encode(bStream.toByteArray()).getBytes());

      message.setContent(multipart);                                             // Put parts in message
      message.setText(Message_Text.getValue()+" [ An_Info_Entry.Contact_Id = "+An_Info_Entry.Contact_Id+" ]");

      Transport.send(message);
    }
    catch (Exception ex)
    {
      // ...
    }
  }

Answer 1

可能是因为：

您将内容类型设置为：text/html，而您实际上是在发送原始二进制文件。

MimeBodyPart attachment=new MimeBodyPart();
attachment.setFileName(An_Info_Entry.Contact_Id);
attachment.setContent(attachmentData,"text/html"); // <-- Here
multipart.addBodyPart(attachment);

即使您使用了正确的内容类型，也应该使用base64对内容进行编码，使附件可以通过网络进行编码。

// This
//attachmentData=bStream.toByteArray(); 
// should be  something like:
attachmentData=Base64Coder.encode( bStream.toByteArray());

如何使用Java在电子邮件中附加对象？

1 个答案: