我可以获取电子邮件标题.但是,我无法使用此API下载电子邮件附件.以下是代码段.

FolderId folderId = new FolderId(WellKnownFolderName.InBox,"mailBox@example.com");
findResults = service.findItems(folderId,view);
for(Item item : findResults.getItems()) {
   if (item.getHasAttachments()) {
      AttachmentCollection attachmentsCol = item.getAttachments();
      System.out.println(attachmentsCol.getCount()); // This is printing zero all the time. My message has one attachment.
      for (int i = 0; i < attachmentsCol.getCount(); i++) {
         FileAttachment attachment = (FileAttachment)attachmentsCol.getPropertyAtIndex(i);
         String name = attachment.getFileName();
         int size = attachment.getContent().length;
      }
   }
}

item.getHasAttachments()返回true,但attachmentsCol.getCount()为0.