如何获取电子邮件所有附件的文件名？ [英] How to get filename of all attachements of email?

问题描述

我正在尝试使用java和imap获取所有电子邮件附件的文件名。我的代码是：

I am trying to get the filename of all the attachements of emails using java and imap.My code is:

MimeMessage msg = (MimeMessage) messages[i];
String fileName = msg.getFileName();
System.out.println("The file name of this attachment is " + fileName);

但即使电子邮件包含附件，它也会始终打印出来。我在SO上看到了不同的代码但没有如果附件不止一个，我不知道该怎么办。

PS：我只想获取文件名而不想下载附件。

but it prints null always even if email contain attachment..I have seen different codes on SO but none worked...and I don't know what to do if attachment is more than one .
PS:I only want to get the filename and don't want to download attachments.

推荐答案

首先，使用以下代码确定邮件是否包含附件：

First, to determine if a message may contain attachments using the following code:

// suppose 'message' is an object of type Message
String contentType = message.getContentType();

if (contentType.contains("multipart")) {
    // this message may contain attachment
}

然后我们必须遍历多部分中的每个部分，以确定哪个部分包含附件，如下所示：

Then we must iterate through each part in the multipart to identify which part contains the attachment, as follows:

Multipart multiPart = (Multipart) message.getContent();

for (int i = 0; i < multiPart.getCount(); i++) {
    MimeBodyPart part = (MimeBodyPart) multiPart.getBodyPart(i);
    if (Part.ATTACHMENT.equalsIgnoreCase(part.getDisposition())) {
        // this part is attachment
        // code to save attachment...
    }
}

要保存文件，你可以这样做：

And to save the file, you could do:

part.saveFile("D:/Attachment/" + part.getFileName());

Source

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