Add Attachment in Java

This is sample code to create an attachment using Java. You will use the Java Mail API to create attachments. The addAttachments method is the method you will use to create the attachments. You will pass in an array of paths that contain the location of your attachments, and Java will create the attachments for to send in the email.

import javax.mail.*;
import javax.mail.internet.*;
import javax.activation.*;
import java.io.*;
import java.util.Properties;
public class MailClient
{
public void sendMail(String mailServer, String from, String to,
String subject, String messageBody,
String[] attachments) throws
MessagingException, AddressException
{
// Setup mail server
Properties props = System.getProperties();
props.put("mail.smtp.host", mailServer);
// Get a mail session
Session session = Session.getDefaultInstance(props, null);
// Define a new mail message
Message message = new MimeMessage(session);
message.setFrom(new InternetAddress(from));
message.addRecipient(Message.RecipientType.TO, new InternetAddress(to));
message.setSubject(subject);
// Create a message part to represent the body text
BodyPart messageBodyPart = new MimeBodyPart();
messageBodyPart.setText(messageBody);
//use a MimeMultipart as we need to handle the file attachments
Multipart multipart = new MimeMultipart();
//add the message body to the mime message
multipart.addBodyPart(messageBodyPart);
// add any file attachments to the message
addAtachments(attachments, multipart);
// Put all message parts in the message
message.setContent(multipart);
// Send the message
Transport.send(message);
}
protected void addAtachments(String[] attachments, Multipart multipart)
throws MessagingException, AddressException
{
for(int i = 0; i<= attachments.length -1; i++ )
{
String filename = attachments[i];
MimeBodyPart attachmentBodyPart = new MimeBodyPart();
//use a JAF FileDataSource as it does MIME type detection
DataSource source = new FileDataSource(filename);
attachmentBodyPart.setDataHandler(new DataHandler(source));
//assume that the filename you want to send is the same as the
//actual file name - could alter this to remove the file path
attachmentBodyPart.setFileName(filename);
//add the attachment
multipart.addBodyPart(attachmentBodyPart);
}
}
public static void main(String[] args)
{
try
{
MailClient client = new MailClient();
String server="pop3.mydomain.com";
String from="myname@mydomain.com";
String to = "someuser@somewhere.com";
String subject="Test";
String message="Testing";
String[] filenames =
{"c:\somefile.txt"};
client.sendMail(server,from,to,subject,message,filenames);
}
catch(Exception e)
{
e.printStackTrace(System.out);
}
}
}