How to give inputstream as mail attachment in javamail

To send an InputStream as an attachment in a JavaMail message, you can use the DataSource class to wrap the InputStream and then add it to the message using the MimeBodyPart class.

Here's an example:

import javax.mail.*;
import javax.mail.internet.*;
import java.io.*;

// Create a new MimeMessage
MimeMessage msg = new MimeMessage(session);

// Set the message subject and from address
msg.setSubject("Test attachment");
msg.setFrom(new InternetAddress("[email protected]"));

// Create a new MimeBodyPart
MimeBodyPart mbp = new MimeBodyPart();

// Create a new DataSource to wrap the InputStream
DataSource ds = new ByteArrayDataSource(inputStream, "application/octet-stream");

// Set the DataSource as the attachment
mbp.setDataHandler(new DataHandler(ds));

// Add the attachment to the message
msg.setContent(mbp);

// Send the message
Transport.send(msg);

In this example, inputStream is the InputStream you want to send as an attachment. The ByteArrayDataSource class is used to wrap the InputStream and provide a DataSource interface that JavaMail can use to read the attachment.

You can also use FileDataSource if you have a file on disk and want to send it as an attachment.

DataSource ds = new FileDataSource("path/to/file", "application/octet-stream");

Make sure to set the correct MIME type for the attachment, which is application/octet-stream for binary data.

You can also add multiple attachments to the message by creating multiple MimeBodyPart objects and adding them to the message using the Multipart class.

Multipart mp = new MimeMultipart();
mp.addBodyPart(mbp1);
mp.addBodyPart(mbp2);
msg.setContent(mp);