Jakarta Mail

import jakarta.mail.*;import jakarta.mail.internet.*;import java.time.*;import java.util.*;// Send a simple, single part, text/plain e-mailpublic class TestEmail {    static Clock clock = Clock.systemUTC();    public static void main(String[] args) {        // SUBSTITUTE YOUR EMAIL ADDRESSES HERE!        String to = "sendToMailAddress";        String from = "sendFromMailAddress";        // SUBSTITUTE YOUR ISP'S MAIL SERVER HERE!        String host = "smtp.yourisp.invalid";        // 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 {            // Instantiate a message            Message 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("Test E-Mail through Java");            Date now = Date.from(LocalDateTime.now(clock).toInstant(ZoneOffset.UTC));            msg.setSentDate(now);            // Set message content            msg.setText("This is a test of sending a " +                        "plain text e-mail through Java.\n" +                        "Here is line 2.");            //Send the message            Transport.send(msg);        } catch (MessagingException mex) {            // Prints all nested (chained) exceptions as well            mex.printStackTrace();        }    }}

package org.example;import jakarta.activation.*;import jakarta.mail.*;import jakarta.mail.internet.*;import java.io.*;import java.time.*;import java.util.*;public class SendMailUsage {    static Clock clock = Clock.systemUTC();    public static void main(String[] args) {        // SUBSTITUTE YOUR EMAIL ADDRESSES HERE!!!        String to = "sendToMailAddress";        String from = "sendFromMailAddress";        // SUBSTITUTE YOUR ISP'S MAIL SERVER HERE!!!        String host = "smtpserver.yourisp.invalid";        // Create properties for the Session        Properties props = new Properties();        // If using static Transport.send(),        // need to specify the mail server here        props.put("mail.smtp.host", host);        // To see what is going on behind the scene        props.put("mail.debug", "true");        // Get a session        Session session = Session.getInstance(props);        try {            // Get a Transport object to send e-mail            Transport bus = session.getTransport("smtp");            // Connect only once here            // Transport.send() disconnects after each send            // Usually, no username and password is required for SMTP            bus.connect();            //bus.connect("smtpserver.yourisp.net", "username", "password");            // Instantiate a message            Message msg = new MimeMessage(session);            // Set message attributes            msg.setFrom(new InternetAddress(from));            InternetAddress[] address = {new InternetAddress(to)};            msg.setRecipients(Message.RecipientType.TO, address);            // Parse a comma-separated list of email addresses. Be strict.            msg.setRecipients(Message.RecipientType.CC,                    InternetAddress.parse(to, true));            // Parse comma/space-separated list. Cut some slack.            msg.setRecipients(Message.RecipientType.BCC,                    InternetAddress.parse(to, false));            msg.setSubject("Test E-Mail through Java");            msg.setSentDate(Date.from(LocalDateTime.now(clock).toInstant(ZoneOffset.UTC)));            // Set message content and send            setTextContent(msg);            msg.saveChanges();            bus.sendMessage(msg, address);            setMultipartContent(msg);            msg.saveChanges();            bus.sendMessage(msg, address);            setFileAsAttachment(msg, "C:/WINDOWS/CLOUD.GIF");            msg.saveChanges();            bus.sendMessage(msg, address);            setHTMLContent(msg);            msg.saveChanges();            bus.sendMessage(msg, address);            bus.close();        } catch (MessagingException mex) {            // Prints all nested (chained) exceptions as well            mex.printStackTrace();            // How to access nested exceptions            while (null != mex.getNextException()) {                // Get next exception in chain                Exception ex = mex.getNextException();                ex.printStackTrace();                if (!(ex instanceof MessagingException)) break;                else mex = (MessagingException) ex;            }        }    }    // A simple, single-part text/plain e-mail.    public static void setTextContent(Message msg) throws MessagingException {        // Set message content        String mytxt = "This is a test of sending a " +                       "plain text e-mail through Java.\n" +                       "Here is line 2.";        msg.setText(mytxt);        // Alternate form        msg.setContent(mytxt, "text/plain");    }    // A simple multipart/mixed e-mail. Both body parts are text/plain.    public static void setMultipartContent(Message msg) throws MessagingException {        // Create and fill first part        MimeBodyPart p1 = new MimeBodyPart();        p1.setText("This is part one of a test multipart e-mail.");        // Create and fill second part        MimeBodyPart p2 = new MimeBodyPart();        // Here is how to set a charset on textual content        p2.setText("This is the second part", "us-ascii");        // Create the Multipart.  Add BodyParts to it.        Multipart mp = new MimeMultipart();        mp.addBodyPart(p1);        mp.addBodyPart(p2);        // Set Multipart as the message's content        msg.setContent(mp);    }    // Set a file as an attachment.  Uses JAF FileDataSource.    public static void setFileAsAttachment(Message msg, String filename)            throws MessagingException {        // Create and fill first part        MimeBodyPart p1 = new MimeBodyPart();        p1.setText("This is part one of a test multipart e-mail." +                   "The second part is file as an attachment");        // Create second part        MimeBodyPart p2 = new MimeBodyPart();        // Put a file in the second part        FileDataSource fds = new FileDataSource(filename);        p2.setDataHandler(new DataHandler(fds));        p2.setFileName(fds.getName());        // Create the Multipart.  Add BodyParts to it.        Multipart mp = new MimeMultipart();        mp.addBodyPart(p1);        mp.addBodyPart(p2);        // Set Multipart as the message's content        msg.setContent(mp);    }    // Set a single part HTML content.    // Sending data of any type is similar.    public static void setHTMLContent(Message msg) throws MessagingException {        String html = "<html><head><title>" +                      msg.getSubject() +                      "</title></head><body><h1>" +                      msg.getSubject() +                      "</h1><p>This is a test of sending an HTML e-mail" +                      " through Java.</body></html>";        // HTMLDataSource is a static nested class        msg.setDataHandler(new DataHandler(new HTMLDataSource(html)));    }    /*     * Static nested class to act as a JAF datasource to send HTML e-mail content     */    static class HTMLDataSource implements DataSource {        private String html;        public HTMLDataSource(String htmlString) {            html = htmlString;        }        // Return html string in an InputStream.        // A new stream must be returned each time.        public InputStream getInputStream() throws IOException {            if (null == html) throw new IOException("Null HTML");            return new ByteArrayInputStream(html.getBytes());        }        public OutputStream getOutputStream() throws IOException {            throw new IOException("This DataHandler cannot write HTML");        }        public String getContentType() {            return "text/html";        }        public String getName() {            return "JAF text/html dataSource to send e-mail only";        }    }}