识别并提取 RTF 格式 MSG 中的嵌入式附件

具有 RTF 格式正文的电子邮件可能包含内联附件，这些附件要么以整体对象形式嵌入，要么以图标形式嵌入。为区分这两种类型的附件，需要先检查附件的特定属性。满足基于附件属性的特定条件后，可通过从其 ObjectData 中提取来保存附件。

本文识别并提取 RTF 格式 MSG 文件中的嵌入式附件。

Java

   static void ExtractInlineAttachments()

  {

        MapiMessage message = MapiMessage.fromFile("Test.msg");

    MapiAttachmentCollection attachments = message.getAttachments();

    for (Object untypedAttachment : attachments)

    {

          MapiAttachment attachment = (MapiAttachment) untypedAttachment;

          if(IsAttachmentInline(attachment))

          {

                try

                {

                      SaveAttachment(attachment, UUID.randomUUID().toString());

                }

                catch (IOException | FileNotFoundException e)

                {

                      // TODO Auto-generated catch block

                          e.printStackTrace();

                    }

              }

        }

  }

  static boolean IsAttachmentInline(MapiAttachment attachment)

  {

        MapiObjectProperty objectData = attachment.getObjectData();

        if (objectData == null)

              return false;

        for (Object prop : attachment.getObjectData().getProperties().getValues())

        {

              MapiProperty property = (MapiProperty)prop;

              if ("\u0003ObjInfo".equals(property.getName()))

              {

                    byte[] data = property.getData();

                    int odtPersist1 = data[1] << 8 | data[0];

                    return (odtPersist1 & 0x40) == 0;

              }

        }

        return false;

  }

  static void SaveAttachment(MapiAttachment attachment, String fileName) throws IOException, FileNotFoundException

  {

        for (Object prop : attachment.getObjectData().getProperties().getValues())

        {

              MapiProperty property = (MapiProperty)prop;

              if ("Package".equals(property.getName()))

          {

                FileOutputStream fs;

                try

                {

                      fs = new FileOutputStream(fileName);

                      fs.write(property.getData(), 0, property.getData().length);

                }

                catch (java.io.IOException e)

                {

                      // TODO Auto-generated catch block

                          e.printStackTrace();

                    }

              }

        }

  }