Simple sending mail by JavaMail

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

public class SendMail {

    // Send a simple, single part, text/plain e-mail
    public void sendSimple(String toAddress, String body){
        String DEFAULT_ENCODING = "UTF-8";
        // SUBSTITUTE YOUR EMAIL ADDRESSES HERE!!!
        String to = toAddress;
        String from = "your_email_here";
        // SUBSTITUTE YOUR ISP'S MAIL SERVER HERE!!!
        String host = "your_email_server_host_here";

        // 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
            MimeMessage 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("your_subject_here", DEFAULT_ENCODING);
            msg.setSentDate(new Date());

            // Set message content
            msg.setText(body, DEFAULT_ENCODING);
            //Send the message
            Transport.send(msg);
        }
        catch (MessagingException mex) {
            // Prints all nested (chained) exceptions as well
            mex.printStackTrace();
        }
    }
}

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Link download JavaMail component: here
Note: if you use JavaMail on Web application, please copy mail.jar to lib folder of Web Application Server