查找邮件附件大小 [英] Find email attachment size

问题描述

我有以下代码，我附加一个文件作为电子邮件的附件。我也尝试找到bodypart的大小（在这种情况下的附件），但它返回我-1。我在哪里出错？

I have the following code, where I attach a file as an attachment to a email. I also try to find the size of bodypart(attachment in this case) but it returns me -1. Where am I going wrong ?

mBP = new MimeBodyPart();
DataSource source = new FileDataSource(fileName);
mBP.setDataHandler(new DataHandler(source));
content.addBodyPart(mBP);
String attachmentSize = mBP.getSize()+"Bytes";

即使附件正确发送，它的大小返回为-1Bytes。

Even though the attachment gets correctly sent, it returns size as -1Bytes.

推荐答案

没有办法从getSize（）方法中获得确切的附件大小。它近似于实际大小的60％，因为该方法忽略任何编码的内容。唯一的方法是读取内容作为字节来计算大小。

There is no way you get the exact attachment size from getSize() method. It approximates to 60% of actual size as the method ignores any encoded content. The only way is to read the contents as bytes to figure out the size.

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