我使用Gmail的Java SDK与附件发送电子邮件。
从这个文件,最大上传文件大小为35 MB。 (https://developers.google.com/gmail/api/v1/reference/users/messages/send)。
然而,在现实中,我只能用附件发送电子邮件,只有5MB的最大尺寸,超出了我从谷歌获得400错误请求过大的错误。
这是我创建发送前的MIME消息的代码:
Properties props = new Properties();
Session session = Session.getDefaultInstance(props, null);
MimeMessage email = new MimeMessage(session);
email.setFrom(new InternetAddress(from));
email.setRecipient(javax.mail.Message.RecipientType.TO, new InternetAddress(to));
email.setSubject(SUBJECT_RE + subject);
email.setReplyTo(new Address[]{new InternetAddress(from)});
String references = getMailReferences(messageId, service);
if(StringUtils.isNotEmpty(references)) {
email.setHeader(MAIL_HEADER_REFERENCES, references);
}
MimeBodyPart mimeBodyPart = new MimeBodyPart();
mimeBodyPart.setContent(bodyText, "text/plain");
Multipart multipart = new MimeMultipart("mixed");
multipart.addBodyPart(mimeBodyPart);
for(int i=0 ; i< attachments.size() ; i++) {
EmailAttach attachment = attachments.get(i);
MimeBodyPart mimeBodyPartAttachment = new MimeBodyPart();
InputStream inputStream = new ByteArrayInputStream(attachment.getAttachmentBytes());
DataHandler dataHandler = new DataHandler(new InputStreamDataSource(inputStream, attachment.getFileName()));
mimeBodyPartAttachment.setDataHandler(dataHandler);
mimeBodyPartAttachment.setFileName(dataHandler.getName());
multipart.addBodyPart(mimeBodyPartAttachment);
}
email.setContent(multipart);
是否有大小限制发送电子邮件附件与Gmail或有变化所需的代码来处理大附件(例如处理/创建MimeBodyPart的)(> 5MB)?
解决了,你需要使用的方法与AbstractInputStreamContent参数发送和消息内容不这样做的Base64编码:
Message message = createMessageWithEmail(emailContent, threadId);
ByteArrayOutputStream buffer = new ByteArrayOutputStream();
emailContent.writeTo(buffer);
message = service.users().messages().send(userId, message, new ByteArrayContent("message/rfc822", buffer.toByteArray())).execute();