java - 使用 Spring JavaMailSender 将文件作为附件或内联发送

Question

我创建了一个简单的 spring 应用程序，它向用户发送电子邮件。这似乎与“SimpleMailMessage”完美配合(整个消息都是纯文本)。我想要的是将一些文件作为附件发送，所以我尝试使用 javax.mail.internet.MimeMessage 但收到一些我无法追踪的有线错误。下面是我的片段

try {
            javax.mail.internet.MimeMessage message = mailSender.createMimeMessage();
            MimeMessageHelper helper = new MimeMessageHelper(message,true);
            helper.setTo(employee.getEmailId());
            helper.setFrom("abc@xyz.com");
            helper.setText(mailMessage, true);
            helper.setSubject(subject);
            FileSystemResource res = new FileSystemResource(new File("C:/software/Koala.jpeg"));
            helper.addAttachment("happyBirthday", res);
            mailSender.send(message);
        } catch (MessagingException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

错误是:

Caused by: java.lang.LinkageError: loader constraint violation: when resolving method "javax.mail.internet.MimeBodyPart.setDataHandler(Ljavax/activation/DataHandler;)V" the class loader (instance of org/jboss/classloader/spi/base/BaseClassLoader) of the current class, org/springframework/mail/javamail/MimeMessageHelper, and the class loader (instance of org/jboss/classloader/spi/base/BaseClassLoader) for resolved class, javax/mail/internet/MimeBodyPart, have different Class objects for the type n/DataHandler;)V used in the signature
    at org.springframework.mail.javamail.MimeMessageHelper.addAttachment(MimeMessageHelper.java:997)
    at org.springframework.mail.javamail.MimeMessageHelper.addAttachment(MimeMessageHelper.java:1077)
    at org.springframework.mail.javamail.MimeMessageHelper.addAttachment(MimeMessageHelper.java:1047)
    at Example1.sendEmail(Example1.java:89)

任何帮助将不胜感激。

Answer 1

尝试使用 Byte[] 类型，您必须使用以下代码将文件转换为 Byte[] :

Path path = Paths.get("path/to/file");
byte[] content = Files.readAllBytes(path);

当您准备好发送邮件时调用此函数:

public void sendEmail(String to,String from,String sub,String msgBody,byte[] content){

    MimeMessage message = mailSender.createMimeMessage();
    try {
        MimeMessageHelper helper = new MimeMessageHelper(message, true);
        helper.setFrom(from);
        helper.setTo(to);
        helper.setSubject(sub);
        helper.setText(msgBody);
        helper.addAttachment("MyTestFile.txt", new ByteArrayResource(content));
        mailSender.send(message);
    } catch (MessagingException e) {

        e.printStackTrace();
    }
}