1. Precondition
1) Import mail-1.4.1.jar for basic javax.mail api which can be found here
http://www.oracle.com/technetwork/java/javamail/index-138643.html
2) Import greenmail-1.3.1.jar for easy mail test which can be found here
http://www.icegreen.com/greenmail/
3) Import JUnit4 Library
2. A simple example for sending pure text email <Test passed!>
package edu.xmu.mail;
import java.util.Properties;
import javax.mail.Authenticator;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.AddressException;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import org.junit.Before;
import org.junit.Test;
public class SendMail
{
private static final String SMTP_HOST_NAME = "smtp.gmail.com";
private static final String SMTP_AUTH_USER = "[email protected]";
private static final String SMTP_AUTH_PWD = "*******";
private static final String SMTP_PORT_NUM = "465";
@Before
public void setUp()
{
}
@Test
public void sendMail()
{
String[] fakeToList = { "[email protected]", "[email protected]" };
InternetAddress[] realToList = new InternetAddress[fakeToList.length];
String from = "[email protected]";
String subject = "Hello World!";
String content = "This is a test email from java-mail";
Transport transport = null;
// Set the host smtp address
Properties properties = System.getProperties();
properties.put("mail.smtp.host", SMTP_HOST_NAME);
properties.put("mail.smtp.user", SMTP_AUTH_USER);
properties.put("mail.smtp.port", SMTP_PORT_NUM);
properties.put("mail.smtp.socketFactory.port", SMTP_PORT_NUM);
properties.put("mail.smtp.socketFactory.class",
"javax.net.ssl.SSLSocketFactory");
properties.put("mail.smtp.auth", "true");
properties.put("mail.smtp.debug", "true");
properties.put("mail.smtp.starttls.enable", "true");
properties.put("javax.net.ssl.SSLSocketFactory", "false");
Authenticator auth = new SMTPAuthenticator();
Session session = Session.getDefaultInstance(properties, auth);
MimeMessage message = new MimeMessage(session);
try
{
message.setFrom(new InternetAddress(from));
for (int i = 0; i < fakeToList.length; i++)
{
realToList[i] = new InternetAddress(fakeToList[i]);
}
message.setRecipients(Message.RecipientType.TO, realToList);
message.setSubject(subject);
message.setContent(content, "text/plain");
// For HTML-Email
// message.setContent(content, "text/html");
transport = session.getTransport("smtp");
transport.connect(SMTP_HOST_NAME, Integer.valueOf(SMTP_PORT_NUM)
.intValue(), SMTP_AUTH_USER, SMTP_AUTH_PWD);
transport.sendMessage(message, message.getAllRecipients());
System.out.println("Message sent successflly...");
} catch (AddressException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
} catch (MessagingException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
} finally
{
try
{
transport.close();
} catch (MessagingException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
private class SMTPAuthenticator extends Authenticator
{
@Override
public PasswordAuthentication getPasswordAuthentication()
{
String username = SMTP_AUTH_USER;
String password = SMTP_AUTH_PWD;
return new PasswordAuthentication(username, password);
}
}
}
3. A more complex example for sending email with attachment <Test passed!>
package edu.xmu.mail;
import java.util.Properties;
import javax.activation.DataHandler;
import javax.activation.DataSource;
import javax.activation.FileDataSource;
import javax.mail.Authenticator;
import javax.mail.BodyPart;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Multipart;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.AddressException;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;
import org.junit.Before;
import org.junit.Test;
public class SendMail
{
private static final String SMTP_HOST_NAME = "smtp.gmail.com";
private static final String SMTP_AUTH_USER = "[email protected]";
private static final String SMTP_AUTH_PWD = "******";
private static final String SMTP_PORT_NUM = "465";
@Before
public void setUp()
{
}
@Test
public void sendMail()
{
String[] fakeToList = { "[email protected]", "[email protected]" };
InternetAddress[] realToList = new InternetAddress[fakeToList.length];
String from = "[email protected]";
String subject = "Hello World!";
String content = "This is a test email from java-mail";
Transport transport = null;
// Set the host smtp address
Properties properties = System.getProperties();
properties.put("mail.smtp.host", SMTP_HOST_NAME);
properties.put("mail.smtp.user", SMTP_AUTH_USER);
properties.put("mail.smtp.port", SMTP_PORT_NUM);
properties.put("mail.smtp.socketFactory.port", SMTP_PORT_NUM);
properties.put("mail.smtp.socketFactory.class",
"javax.net.ssl.SSLSocketFactory");
properties.put("mail.smtp.auth", "true");
properties.put("mail.smtp.debug", "true");
properties.put("mail.smtp.starttls.enable", "true");
properties.put("javax.net.ssl.SSLSocketFactory", "false");
Authenticator auth = new SMTPAuthenticator();
Session session = Session.getDefaultInstance(properties, auth);
MimeMessage message = new MimeMessage(session);
System.out.println("CurrentPath = " + ClassLoader.getSystemResource("")
+ "attachment.txt");
try
{
message.setFrom(new InternetAddress(from));
for (int i = 0; i < fakeToList.length; i++)
{
realToList[i] = new InternetAddress(fakeToList[i]);
}
message.setRecipients(Message.RecipientType.TO, realToList);
message.setSubject(subject);
// Create a multi-part message
Multipart multipart = new MimeMultipart();
// Set part one -> plain text
BodyPart messageBodyPart = new MimeBodyPart();
messageBodyPart.setText(content);
multipart.addBodyPart(messageBodyPart);
// Set part two -> attachment
BodyPart attachmentBodyPart = new MimeBodyPart();
String fileName = ClassLoader.getSystemResource("").toString()
.replaceAll("%20", " ").replaceAll("file:/", "")
+ "attachment.txt";
DataSource source = new FileDataSource(fileName);
attachmentBodyPart.setDataHandler(new DataHandler(source));
attachmentBodyPart.setFileName("attachment.txt");
multipart.addBodyPart(attachmentBodyPart);
message.setContent(multipart);
transport = session.getTransport("smtp");
transport.connect(SMTP_HOST_NAME, Integer.valueOf(SMTP_PORT_NUM)
.intValue(), SMTP_AUTH_USER, SMTP_AUTH_PWD);
transport.sendMessage(message, message.getAllRecipients());
System.out.println("Message sent successflly...");
} catch (AddressException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
} catch (MessagingException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
} finally
{
try
{
transport.close();
} catch (MessagingException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
private class SMTPAuthenticator extends Authenticator
{
@Override
public PasswordAuthentication getPasswordAuthentication()
{
String username = SMTP_AUTH_USER;
String password = SMTP_AUTH_PWD;
return new PasswordAuthentication(username, password);
}
}
}
P.S
Good resource to refer to:
1) https://java.net/projects/javamail/pages/Home
2) http://stackoverflow.com/questions/1990454/using-javamail-to-connect-to-gmail-smtp-server-ignores-specified-port-and-tries ---> Inspired me a lot in configure gmail smtp service
3) http://blog.csdn.net/zapldy/article/details/3971579 ---> A very detailed blog about Java Mail
4) http://704378737-qq-com.iteye.com/blog/796566 ---> A very detailed blog about Java Path