send HTML mail with JavaMail.

布满荆棘的人生 2022-01-14 09:05 67阅读 0赞

http://www.rgagnon.com/javadetails/java-0504.html

It's easy to send HTML mail with JavaMail. Simply set the content type to "text/html".

import javax.mail.*;
    import javax.mail.internet.*;
    
    import java.util.Properties;
    
    class SimpleMail {
        public static void main(String[] args) throws Exception{
            System.out.println("Sending mail...");
            Properties props = new Properties();
            props.setProperty("mail.transport.protocol", "smtp");
            props.setProperty("mail.host", "smtp.mymailserver.com");
            props.setProperty("mail.user", "myuser");
            props.setProperty("mail.password", "mypwd");
    
            Session mailSession = Session.getDefaultInstance(props, null);
            mailSession.setDebug(true);
            Transport transport = mailSession.getTransport();
    
            MimeMessage message = new MimeMessage(mailSession);
            message.setSubject("HTML  mail with p_w_picpaths");
            message.setFrom(new InternetAddress("me@sender.com"));
            message.setContent("<h1>Hello world</h1>", "text/html");
            message.addRecipient(Message.RecipientType.TO,
                 new InternetAddress("you@receiver.com"));
    
            transport.connect();
            transport.sendMessage(message,
                message.getRecipients(Message.RecipientType.TO));
            transport.close();
            }
    }

One approach to include p\_w\_picpaths in the mail body is to use the IMG tag and make the p\_w\_picpaths available on a server.

import javax.mail.*;
    import javax.mail.internet.*;
    
    import java.util.Properties;
    
    class SimpleMail1 {
        public static void main(String[] args) throws Exception{
            System.out.println("Sending mail...");
            Properties props = new Properties();
            props.setProperty("mail.transport.protocol", "smtp");
            props.setProperty("mail.host", "smtp.mymailserver.com");
            props.setProperty("mail.user", "myuser");
            props.setProperty("mail.password", "mypwd");
    
            Session mailSession = Session.getDefaultInstance(props, null);
            mailSession.setDebug(true);
            Transport transport = mailSession.getTransport();
    
            MimeMessage message = new MimeMessage(mailSession);
            message.setSubject("HTML  mail with p_w_picpaths");
            message.setFrom(new InternetAddress("me@sender.com"));
            message.setContent
              ("<h1>This is a test</h1>" 
               + "<img src=\"http://www.rgagnon.com/p_w_picpaths/jht.gif\">", 
               "text/html");
            message.addRecipient(Message.RecipientType.TO,
                 new InternetAddress("you@receiver.com"));
    
            transport.connect();
            transport.sendMessage(message,
                message.getRecipients(Message.RecipientType.TO));
            transport.close();
            }
    }

The browser accesses these p\_w\_picpaths just as if it were displaying an p\_w\_picpath in a Web page. Unfortunately, spammers have used this mechanism as a sneaky way to record who visits their site (and mark your email as valid). To protect your privacy, many Web-based (and other) email clients don't display p\_w\_picpaths in HTML emails.

An alternative to placing absolute URLs to p\_w\_picpaths in your HTML is to include the p\_w\_picpaths as p\_w\_uploads to the email. The HTML can reference the p\_w\_picpath in an p\_w\_upload by using the protocol prefix *cid:* plus the content-id of the p\_w\_upload.

import javax.mail.*;
    import javax.mail.internet.*;
    import javax.activation.*;
    
    import java.util.Properties;
    
    class SimpleMail2 {
        public static void main(String[] args) throws Exception{
            System.out.println("Sending mail...");
            Properties props = new Properties();
            props.setProperty("mail.transport.protocol", "smtp");
            props.setProperty("mail.host", "smtp.mymailserver.com");
            props.setProperty("mail.user", "myuser");
            props.setProperty("mail.password", "mypwd");
    
            Session mailSession = Session.getDefaultInstance(props, null);
            mailSession.setDebug(true);
            Transport transport = mailSession.getTransport();
    
            MimeMessage message = new MimeMessage(mailSession);
            message.setSubject("HTML  mail with p_w_picpaths");
            message.setFrom(new InternetAddress("me@sender.com"));
            message.addRecipient(Message.RecipientType.TO,
                 new InternetAddress("you@receiver.com"));
    
            //
            // This HTML mail have to 2 part, the BODY and the embedded p_w_picpath
            //
            MimeMultipart multipart = new MimeMultipart("related");
    
            // first part  (the html)
            BodyPart messageBodyPart = new MimeBodyPart();
            String htmlText = "<H1>Hello</H1><img src=\"cid:p_w_picpath\">";
            messageBodyPart.setContent(htmlText, "text/html");
    
            // add it
            multipart.addBodyPart(messageBodyPart);
            
            // second part (the p_w_picpath)
            messageBodyPart = new MimeBodyPart();
            DataSource fds = new FileDataSource
              ("C:\\p_w_picpaths\\jht.gif");
            messageBodyPart.setDataHandler(new DataHandler(fds));
            messageBodyPart.setHeader("Content-ID","<p_w_picpath>");
    
            // add it
            multipart.addBodyPart(messageBodyPart);
    
            // put everything together
            message.setContent(multipart);
    
            transport.connect();
            transport.sendMessage(message,
                message.getRecipients(Message.RecipientType.TO));
            transport.close();
            }
    }

转载于:https://blog.51cto.com/vaporz/747664