Some questions related to implementation of image inside email signature?

Question

i need to implement the email signature with image.As of now we only support the text in email signature which is already working.i need to provide the functionality where

Answer 1

To include images in the email message, first you have to include the images as MIME attachments in the email. Each of these attachments must have a "Content-ID" header.

--f46d0444ea0d6991ba04b91c92e6
Content-Type: image/gif; name="theImage.gif"
Content-Transfer-Encoding: base64
Content-ID: <theImage@abcd>

[base64 string]
--f46d0444ea0d6991ba04b91c92e6--

2) Then, in the email message, include the Content-ID in the src attribute of the <img> tag.

<img src="cid:theImage@abcd" />

Answer 2

For Gmail to see the embedded image from byte array, I posted an answer on another similar question which is to use ByteArrayDataSource and embed it to the HtmlEmail. Here's the code snippet:

import javax.mail.util.ByteArrayDataSource;
import org.apache.commons.mail.ImageHtmlEmail;
...
ImageHtmlEmail email = new ImageHtmlEmail();
byte[] qrImageBytes = createQRCode(); // get your image byte array
ByteArrayDataSource qrImageDataSource = new ByteArrayDataSource(qrImageBytes, "image/png");
String contentId = email.embed(qrImageDataSource, "QR Image");