Enviar correos desde java

Hola amig@s esta vez les mostrare como enviar correos desde nuestra aplicación  java les enseñare como enviar correos unicamente con texto y tambien con archivos adjuntos.

Imagen:

Código:

package elrinconprograues.mail;

import java.util.Properties;
import javax.activation.DataHandler;
import javax.activation.FileDataSource;
import javax.mail.BodyPart;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;

/**
 *
 * @author Alex Callejas
 */
public class SendMail {

    public static final String Username = "example@gmail.com";
    public static final String PassWord = "password";
    static Session session;
    static Properties props;

    public SendMail() {        
    }

    public Session sessionMail() {
        props = new Properties();
        props.put("mail.smtp.auth", "true");
        props.put("mail.smtp.starttls.enable", "true");
        props.put("mail.smtp.host", "smtp.gmail.com");
        props.put("mail.smtp.port", "587");
        session = Session.getInstance(props,
                new javax.mail.Authenticator() {
                    @Override
                    protected PasswordAuthentication getPasswordAuthentication() {
                        return new PasswordAuthentication(Username, PassWord);
                    }
                });
        return session;
    }
    
    public void send(String to,String msg){
        try {
            Message message = new MimeMessage(sessionMail());
            message.setFrom(new InternetAddress(Username));
            message.setRecipients(Message.RecipientType.TO,
                    InternetAddress.parse(to));
            message.setSubject("Subject");
            message.setText(msg);
            Transport.send(message);   
        } catch (MessagingException e) {
            System.out.println(e.getMessage());
        }
    }
    
    public void send(String to,String msg,String srcAttached){
        try {
            sessionMail();
            BodyPart attached = new MimeBodyPart();
            BodyPart texto = new MimeBodyPart();
            texto.setText(msg);
            MimeMultipart multiParte = new MimeMultipart();
            attached.setDataHandler(
                    new DataHandler(new FileDataSource(srcAttached)));
            attached.setFileName("File Name");
            multiParte.addBodyPart(texto);
            multiParte.addBodyPart(attached);
            Message message = new MimeMessage(sessionMail());
            message.setFrom(new InternetAddress(Username));
            message.setRecipients(Message.RecipientType.TO,
                    InternetAddress.parse(to));
            message.setSubject("Subject");
            message.setContent(multiParte);
            message.setText(msg);
            message.setContent(multiParte);
            Transport.send(message);            
        } catch (MessagingException ex) {
            System.out.println(ex.getMessage());
        }        
    }
    
    public static void main(String[] args) {
        SendMail sendMail=new SendMail();
        sendMail.send("example@mail.com", "Esta es una prueba de envio de correos con java");
    }
    
}

Descarga: Mega