JavaMail requires an InputStreamSource that creates a fresh stream for every call.
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邮件增加附件时候，报错JavaMail requires an InputStreamSource that creates a fresh stream for every call.
InputStreamResource inputStreamResource = new InputStreamResource(new URL(url).openStream());
mimeMessageHelper.addAttachment(
"wsktn.docx", inputStreamResource
);
解决方式,使用IOUtils.toByteArray 读取后，ByteArrayResource包装解决此问题
ByteArrayResource byteArrayResource = new ByteArrayResource(IOUtils.toByteArray(new URL(url).openStream()));
mimeMessageHelper.addAttachment(
"wsktn.docx", byteArrayResource
);
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