Java Mail Code To Send EMAIL

E-Mailing Through Java Mail

* You use the JavaMail API where as JavaMail implementation providers implement the JavaMail API to give you a JavaMail client (Java JAR file). Sun gives you mail.jar which has Sun's SMTP, POP3 and IMAP client implementations along with the JavaMail API. This is sufficient to send and receive e-mail but not to read or post to newgroups which use NNTP.

Sample Code to Send E-Mail

* To compile and run, you must have mail.jar (from the JavaMail download) and activation.jar (from the JavaBeans Activation Framework download) in Java classpath.

* You need to replace email addresses and mail server with your values where noted. Username and password is generally not needed to send e-mail although your ISP may still require it to prevent spam from going through its systems.

import java.util.*;

import javax.mail.*;

import javax.mail.internet.*;

import javax.activation.*;

// Send a simple, single part, text/plain e-mail

public class TestEmail {

public static void main(String[] args) {

// SUBSTITUTE YOUR EMAIL ADDRESSES HERE!!!

String to = "vipan@vipan.com";

String from = "vipan@vipan.com";

// SUBSTITUTE YOUR ISP'S MAIL SERVER HERE!!!

String host = "smtp.yourisp.net";

// Create properties, get Session

Properties props = new Properties();

// If using static Transport.send(),

// need to specify which host to send it to

props.put("mail.smtp.host", host);

// To see what is going on behind the scene

props.put("mail.debug", "true");

Session session = Session.getInstance(props);

try {

// Instantiatee a message

Message msg = new MimeMessage(session);

//Set message attributes

msg.setFrom(new InternetAddress(from));

InternetAddress[] address = {new InternetAddress(to)};

msg.setRecipients(Message.RecipientType.TO, address);

msg.setSubject("Test E-Mail through Java");

msg.setSentDate(new Date());

// Set message content

msg.setText("This is a test of sending a " +

"plain text e-mail through Java.\n" +

"Here is line 2.");

//Send the message

Transport.send(msg);

}

catch (MessagingException mex) {

// Prints all nested (chained) exceptions as well

mex.printStackTrace();

}

}

}//End of class

Sample Code to Send Multipart E-Mail, HTML E-Mail and File Attachments

* To compile and run, you must have mail.jar (from the JavaMail download) and activation.jar (from the JavaBeans Activation Framework download) in Java classpath.

* You need to replace email addresses and mail server with your values where noted.

* This sample code has debugging turned on ("mail.debug") to see what is going on behind the scenes in JavaMail code.

import java.util.*;

import java.io.*;

import javax.mail.*;

import javax.mail.internet.*;

import javax.activation.*;

public class SendMailUsage {

public static void main(String[] args) {

// SUBSTITUTE YOUR EMAIL ADDRESSES HERE!!!

String to = "you@yourisp.net";

String from = "you@yourisp.net";

// SUBSTITUTE YOUR ISP'S MAIL SERVER HERE!!!

String host = "smtpserver.yourisp.net";

// Create properties for the Session

Properties props = new Properties();

// If using static Transport.send(),

// need to specify the mail server here

props.put("mail.smtp.host", host);

// To see what is going on behind the scene

props.put("mail.debug", "true");

// Get a session

Session session = Session.getInstance(props);

try {

// Get a Transport object to send e-mail

Transport bus = session.getTransport("smtp");

// Connect only once here

// Transport.send() disconnects after each send

// Usually, no username and password is required for SMTP

bus.connect();

//bus.connect("smtpserver.yourisp.net", "username", "password");

// Instantiate a message

Message msg = new MimeMessage(session);

// Set message attributes

msg.setFrom(new InternetAddress(from));

InternetAddress[] address = {new InternetAddress(to)};

msg.setRecipients(Message.RecipientType.TO, address);

// Parse a comma-separated list of email addresses. Be strict.

msg.setRecipients(Message.RecipientType.CC,

InternetAddress.parse(to, true));

// Parse comma/space-separated list. Cut some slack.

msg.setRecipients(Message.RecipientType.BCC,

InternetAddress.parse(to, false));

msg.setSubject("Test E-Mail through Java");

msg.setSentDate(new Date());

// Set message content and send

setTextContent(msg);

msg.saveChanges();

bus.sendMessage(msg, address);

setMultipartContent(msg);

msg.saveChanges();

bus.sendMessage(msg, address);

setFileAsAttachment(msg, "C:/WINDOWS/CLOUD.GIF");

msg.saveChanges();

bus.sendMessage(msg, address);

setHTMLContent(msg);

msg.saveChanges();

bus.sendMessage(msg, address);

bus.close();

}

catch (MessagingException mex) {

// Prints all nested (chained) exceptions as well

mex.printStackTrace();

// How to access nested exceptions

while (mex.getNextException() != null) {

// Get next exception in chain

Exception ex = mex.getNextException();

ex.printStackTrace();

if (!(ex instanceof MessagingException)) break;

else mex = (MessagingException)ex;

}

}

}

// A simple, single-part text/plain e-mail.

public static void setTextContent(Message msg) throws MessagingException {

// Set message content

String mytxt = "This is a test of sending a " +

"plain text e-mail through Java.\n" +

"Here is line 2.";

msg.setText(mytxt);

// Alternate form

msg.setContent(mytxt, "text/plain");

}

// A simple multipart/mixed e-mail. Both body parts are text/plain.

public static void setMultipartContent(Message msg) throws MessagingException {

// Create and fill first part

MimeBodyPart p1 = new MimeBodyPart();

p1.setText("This is part one of a test multipart e-mail.");

// Create and fill second part

MimeBodyPart p2 = new MimeBodyPart();

// Here is how to set a charset on textual content

p2.setText("This is the second part", "us-ascii");

// Create the Multipart. Add BodyParts to it.

Multipart mp = new MimeMultipart();

mp.addBodyPart(p1);

mp.addBodyPart(p2);

// Set Multipart as the message's content

msg.setContent(mp);

}

// Set a file as an attachment. Uses JAF FileDataSource.

public static void setFileAsAttachment(Message msg, String filename)

throws MessagingException {

// Create and fill first part

MimeBodyPart p1 = new MimeBodyPart();

p1.setText("This is part one of a test multipart e-mail." +

"The second part is file as an attachment");

// Create second part

MimeBodyPart p2 = new MimeBodyPart();

// Put a file in the second part

FileDataSource fds = new FileDataSource(filename);

p2.setDataHandler(new DataHandler(fds));

p2.setFileName(fds.getName());

// Create the Multipart. Add BodyParts to it.

Multipart mp = new MimeMultipart();

mp.addBodyPart(p1);

mp.addBodyPart(p2);

// Set Multipart as the message's content

msg.setContent(mp);

}

// Set a single part html content.

// Sending data of any type is similar.

public static void setHTMLContent(Message msg) throws MessagingException {

String html = "

" +

msg.getSubject() +

"

This is a test of sending an HTML e-mail" +

" through Java.";

// HTMLDataSource is an inner class

msg.setDataHandler(new DataHandler(new HTMLDataSource(html)));

}

/*

* Inner class to act as a JAF datasource to send HTML e-mail content

*/

static class HTMLDataSource implements DataSource {

private String html;

public HTMLDataSource(String htmlString) {

html = htmlString;

}

// Return html string in an InputStream.

// A new stream must be returned each time.

public InputStream getInputStream() throws IOException {

if (html == null) throw new IOException("Null HTML");

return new ByteArrayInputStream(html.getBytes());

}

public OutputStream getOutputStream() throws IOException {

throw new IOException("This DataHandler cannot write HTML");

}

public String getContentType() {

return "text/html";

}

public String getName() {

return "JAF text/html dataSource to send e-mail only";

}

}

} //End of class