JavaMail

package net.codejava.http;

import java.io.IOException;
import java.util.Date;
import java.util.Properties;

import javax.mail.Authenticator;
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;

public class PlainTextEmailSender {

    public void sendPlainTextEmail(String host, String port,
            final String userName, final String password, String toAddress,
            String subject, String message, String[] attachFiles)
            throws AddressException, MessagingException {

        // sets SMTP server properties
        Properties properties = new Properties();
        properties.put("mail.smtp.host", host);
        properties.put("mail.smtp.port", port);
        properties.put("mail.smtp.auth", "true");
        properties.put("mail.smtp.starttls.enable", "true");

        // creates a new session with an authenticator
        Authenticator auth = new Authenticator() {
            public PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication(userName, password);
            }
        };

        Session session = Session.getInstance(properties, auth);

        // creates a new e-mail message
        Message msg = new MimeMessage(session);

        msg.setFrom(new InternetAddress(userName));
        InternetAddress[] toAddresses = { new InternetAddress(toAddress) };
        msg.setRecipients(Message.RecipientType.TO, toAddresses);
        msg.setSubject(subject);
        msg.setSentDate(new Date());

        // creates message part
        MimeBodyPart messageBodyPart = new MimeBodyPart();
        messageBodyPart.setContent(message, "text/html");

        // creates multi-part
        Multipart multipart = new MimeMultipart();
        multipart.addBodyPart(messageBodyPart);

        // adds attachments
        if (attachFiles != null && attachFiles.length > 0) {
            for (String filePath : attachFiles) {
                MimeBodyPart attachPart = new MimeBodyPart();

                try {
                    attachPart.attachFile(filePath);
                } catch (IOException ex) {
                    ex.printStackTrace();
                }

                multipart.addBodyPart(attachPart);
            }
        }

        // sets the multi-part as e-mail‘s content
        msg.setContent(multipart);

        // sends the e-mail
        Transport.send(msg);

    }

    /**
     * Test the send e-mail method
     * 
     */
    public static void main(String[] args) {
        // SMTP server information
        String host = "smtp.gmail.com";
        String port = "587";
        String mailFrom = "mlchina515@gmail.com";
        String password = "malin1994515@";

        // outgoing message information
        String mailTo = "641174088@qq.com";
        String subject = "来呀，来呀，来呀来呀";
        String message = "<i>Greetings!</i><br>";
        message += "<b>Wish you a nice day!</b><br>";
        message += "<font color=red>Duke</font>";
        
        // attachments
        String[] attachFiles = new String[3];
        attachFiles[0] = "C:\\Users\\L\\Pictures\\image\\1.jpg";
        attachFiles[1] = "C:\\Users\\L\\Pictures\\image\\2.jpg";
        attachFiles[2] = "C:\\Users\\L\\Pictures\\image\\3.jpg";

        PlainTextEmailSender mailer = new PlainTextEmailSender();

        try {
            mailer.sendPlainTextEmail(host, port, mailFrom, password, mailTo,
                    subject, message, attachFiles);
            System.out.println("Email sent.");
        } catch (Exception ex) {
            System.out.println("Failed to sent email.");
            ex.printStackTrace();
        }
    }
}