Jakarta Mail

import jakarta.mail.*; import jakarta.mail.internet.*;  import java.time.*; import java.util.*;  // Send a simple, single part, text/plain e-mail public 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";         }     } }