阻止 gmail 将内联图像显示为附件

email java gmail spring

2022-09-04 21:34:34

我正在使用弹簧样品发送内联图像。它可以工作，但gmail也将图像显示为附件。如何避免？

代码非常简单。

public class Email {

    public static  MimeMessagePreparator getContentAsInlineResourceMessagePreparator(final String to) {

        MimeMessagePreparator preparator = new MimeMessagePreparator() {

            public void prepare(MimeMessage mimeMessage) throws Exception {
                MimeMessageHelper helper = new MimeMessageHelper(mimeMessage, true, "UTF-8");

                helper.setSubject("Email with inline image");
                helper.setFrom("fake@yourshop.com");
                helper.setTo(to);

                String content = "Dear pedrofb...";
                helper.setText("<html><body><p>" + content + "</p><img src='cid:company-logo'></body></html>", true);
                helper.addInline("company-logo", new ClassPathResource("logo.png"));
            }
        };
        return preparator;
    }
    public final static void main (String argv[]){
        //Basic SMTP configuration
        JavaMailSenderImpl mailSender = new JavaMailSenderImpl();
        mailSender.setHost(host);
        mailSender.setPort(port);

        MimeMessagePreparator preparator = getContentAsInlineResourceMessagePreparator("myemail@gmail.com");            
        mailSender.send(preparator);
    }

}

我的问题类似于如何阻止电子邮件中的嵌入式图像被GMail显示为附件？但答案非常陈旧，它没有显示如何正确配置弹簧。我不想自己构建消息部分和标头

在 pastebin 中发布了原始消息

答案 1

问题在于决心MimeType

该扩展程序被视为非此原因导致Gmail出现问题。这已经被修复/更改，也可能在一些后来的版本中（我不确定这些）。但是修复非常简单。改变pngimage/x-pngimage/png5.X4.X

MimeMessageHelper helper = new MimeMessageHelper(mimeMessage, true, "UTF-8");

自

MimeMessageHelper helper = new MimeMessageHelper(mimeMessage, true, "UTF-8") {

    @Override
    public void addInline(String contentId, Resource resource) throws MessagingException {
        Assert.notNull(resource, "Resource must not be null");
        String contentType = this.getFileTypeMap().getContentType(resource.getFilename());
        contentType = contentType.replace("x-png", "png");
        this.addInline(contentId, resource, contentType);

    }
};

它将覆盖MimeTypeimage/png