Question

我有一个邮件附件，我想从IteAttachment中提取附件，该附件是电子邮件附件的一部分。我可以提取文件附件。

这里要记住的一点是ItemAttachment内还可以再有一个ItemAttachment，因此我希望代码可以递归地工作以获取所有附件，直到找不到更多的ItemAttachment。

Answer 1

解释和代码示例摘自Microsoft官方文档

Get attachments from an email by using the EWS Managed API

以下代码示例显示如何通过以下方式获取EmailMessage对象：   使用Bind方法，然后遍历附件集合   并在每个上调用FileAttachment.Load或ItemAttachment.Load方法   适当的附件。每个文件附件都保存到   C：\ temp \文件夹，并将每个项目附件加载到内存中。对于   有关如何保存项目附件的信息，请参阅保存附件   使用EWS托管API发送电子邮件。

此示例假定服务是有效的ExchangeService对象，   该itemId是邮件的ItemId，附件将从中发送   被检索，并且用户已通过Exchange身份验证   服务器。

public static void GetAttachmentsFromEmail(ExchangeService service, ItemId itemId)
{
    // Bind to an existing message item and retrieve the attachments collection.
    // This method results in an GetItem call to EWS.
    EmailMessage message = EmailMessage.Bind(service, itemId, new PropertySet(ItemSchema.Attachments));
    // Iterate through the attachments collection and load each attachment.
    foreach (Attachment attachment in message.Attachments)
    {
        if (attachment is FileAttachment)
        {
            FileAttachment fileAttachment = attachment as FileAttachment;
            // Load the attachment into a file.
            // This call results in a GetAttachment call to EWS.
            fileAttachment.Load("C:\\temp\\" + fileAttachment.Name);

            Console.WriteLine("File attachment name: " + fileAttachment.Name);
        }
        else // Attachment is an item attachment.
        {
            ItemAttachment itemAttachment = attachment as ItemAttachment;
            // Load attachment into memory and write out the subject.
            // This does not save the file like it does with a file attachment.
            // This call results in a GetAttachment call to EWS.
            itemAttachment.Load();
            Console.WriteLine("Item attachment name: " + itemAttachment.Name);
        }
    }
}

如何使用EWS Java在ItemAttachment中获取附件

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