일반 Sending mail through Java using SMTP of gmail

Most of the case we required to send mail.
We can use gmail smtp to send the mail.
Code to send the mail are following.
Please update mailId and password:

package com.sendmail; 

import java.util.Properties;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
/**
 * 
 * @author nikhil.nishchal
 *
 */
public class SendMailByGMAIL {

	//Properties for the SMTP configuration
    private static final String MAIL_SMTP_HOST = "smtp.gmail.com";
    private static final String MAIL_SMTP_PORT = "465";
    private static final String SOCKET_FACTORY = "javax.net.ssl.SSLSocketFactory"; 
    private static final String SMTP_AUTH = "true"; 
    private static final String SMTP_SOCKET_PORT = "465"; 
    private static final String SMTP_USER = "xxxxxx@gmail.com"; 
    private static final String SMTP_PASSWORD = "passwordText"; 
    private static final String MAIL_FROM_EMAIL_ID = "frommail@gmail.com"; 
    private static final String MAIL_TO_EMAIL_ID = "tomail@gmail.com"; 

	public static void main(String[] args) { 

		//Initialization of properties 
        Properties props = new Properties(); 
        props.put("mail.smtp.host", MAIL_SMTP_HOST); 
        props.put("mail.smtp.socketFactory.port", SMTP_SOCKET_PORT); 
        props.put("mail.smtp.socketFactory.class", SOCKET_FACTORY); 
        props.put("mail.smtp.auth", SMTP_AUTH); 
        props.put("mail.smtp.port", MAIL_SMTP_PORT); 

         //Making authentication session 
        Session session = Session.getDefaultInstance(props, 
                new javax.mail.Authenticator() { 
                    protected PasswordAuthentication getPasswordAuthentication() { 
                        return new PasswordAuthentication(SMTP_USER, 
                                SMTP_PASSWORD); 
                    } 
                }); 

         try { 
            System.out.println("Sending mail..."); 
            Message message = new MimeMessage(session); 
            message.setFrom(new InternetAddress(MAIL_FROM_EMAIL_ID)); 
            message.setRecipients(Message.RecipientType.TO, 
                    InternetAddress.parse(MAIL_TO_EMAIL_ID)); 
            message.setSubject("Test Mail Subject"); 
            message.setText("Dear Friend," 
                    + "\n\n This is spam free mail, enjoy the text." 
                    + "\n\n\n\n Thanks"); 

           System.out.println("Mail has been sent..."); 

         } catch (MessagingException e) { 
            System.out.println("Exception:\n"+e.getMessage()); 
        } 
    } 
} 

For this, you need Java mail API.
Java mail API we can download from http://www.oracle.com/technetwork/java/javamail/index-138643.html