Adding attachment from local filepath in sendmail

问题

I am trying to attach a local file at path /Users/david/Desktop/screenshot5.png in sendgrid.

    Mail mail = new Mail(from, subject, to, message);

    // add an attachment
    Attachments attachments = new Attachments();
    Base64 x = new Base64();
    String encodedString = x.encodeAsString("/Users/david/Desktop/screenshot5.png");
    attachments.setContent(encodedString);
    attachments.setDisposition("attachment");
    attachments.setFilename("screenshot5.png");
    attachments.setType("image/png");

    mail.addAttachments(attachments);

What would be the proper way to do this?

回答1:

You added the file path.
You should add the file content instead:

Mail mail = new Mail(from, subject, to, message);

// add an attachment
Attachments attachments = new Attachments();
File file = new File("/Users/david/Desktop/screenshot5.png");
byte[] fileContent = Files.readAllBytes(file.toPath());
String encodedString = Base64.getEncoder().encodeToString(fileContent);
attachments.setContent(encodedString);
attachments.setDisposition("attachment");
attachments.setFilename("screenshot5.png");
attachments.setType("image/png");

mail.addAttachments(attachments);

}

来源：https://stackoverflow.com/questions/51005561/adding-attachment-from-local-filepath-in-sendmail