• java email mail sender

• Spring – Sending e-mail with attachment

public class MailMail
{
    private JavaMailSender mailSender;
    private SimpleMailMessage simpleMailMessage;
 
    public void setSimpleMailMessage(SimpleMailMessage simpleMailMessage) {
        this.simpleMailMessage = simpleMailMessage;
    }
 
    public void setMailSender(JavaMailSender mailSender) {
        this.mailSender = mailSender;
    }
 
    public void sendMail(String dear, String content) {
 
        MimeMessage message = mailSender.createMimeMessage();
 
        try{
            MimeMessageHelper helper = new MimeMessageHelper(message, true);
 
            helper.setFrom(simpleMailMessage.getFrom());
            helper.setTo(simpleMailMessage.getTo());
            helper.setSubject(simpleMailMessage.getSubject());
            helper.setText(String.format(
                        simpleMailMessage.getText(), dear, content));
 
            FileSystemResource file = new FileSystemResource("C:\\log.txt");
            helper.addAttachment(file.getFilename(), file);
 
        }catch (MessagingException e) {
            throw new MailParseException(e);
        }
        mailSender.send(message);
    }
}

• 이미 오픈된 InputStream은 ByteArrayDataSource 사용

  ByteArrayDataSource attachment = new ByteArrayDataSource(message.getPayload(), "application/octet-stream");

• Passed-in Resource contains an open stream: invalid argument. JavaMail requires an InputStreamSource that creates a fresh stream for every call. 오류 발생
• JavaMailSender는 InputStream 을 두 번 연다. 한 번은 인코딩을 확인하러, 한 번은 확인한 인코딩으로 인코드 하려고. 따라서 열린 Stream이면 안된다.