[Java] JavaMail 发送带图片的 html 格式的邮件

时间：2023-03-09 02:31:00
[Java] JavaMail 发送带图片的 html 格式的邮件

JavaMail 发送的邮件正文和附件是相互独立的，但是内置图片需要定位图片在正文中的位置，所以内置图片和邮件正文是互相依赖的。

发送带附件的邮件可参考JavaMail 发送 html 格式、带附件的邮件。

发送纯文本的邮件可参照 JavaMail 简单案例。

具体例子

EmailHelper, Email 的帮助类，向帮助类提供 SMTP 服务器域名、用户名、密码、发送人邮箱、收件人邮箱、邮件主题、html 格式的内容、图片的路径，便可发送一份内置图片的邮件。在创建 MimeMultipart 时， 需要传入参数 related，并在正文中声明图片的位置。

SendEmailDemo, 演示发送邮件。

EmailHelper.java

 package mail;

 import java.util.Properties;

 import javax.activation.DataHandler;

 import javax.activation.DataSource;

 import javax.activation.FileDataSource;

 import javax.mail.BodyPart;

 import javax.mail.Message;

 import javax.mail.MessagingException;

 import javax.mail.Multipart;

 import javax.mail.PasswordAuthentication;

 import javax.mail.Session;

 import javax.mail.Transport;

 import javax.mail.internet.AddressException;

 import javax.mail.internet.InternetAddress;

 import javax.mail.internet.MimeBodyPart;

 import javax.mail.internet.MimeMessage;

 import javax.mail.internet.MimeMultipart;

 public class EmailHelper {

     private String host;

     private String username;

     private String password;

     private String from;

     private String to;

     private String subject;

     private String htmlContent;

     private String imagePath;

     public EmailHelper(String host, String username, String password, String from) throws AddressException, MessagingException{

         this.host = host;

         this.username = username;

         this.password = password;

         this.from = from;

     }

     public void sendWithImage() throws Exception {

         Properties props = new Properties();

         props.put("mail.smtp.auth", "true");

         props.put("mail.smtp.host", host);

         final String username1 = username;

         final String password1 = password;

         Session session = Session.getInstance(props, new javax.mail.Authenticator() {

             protected PasswordAuthentication getPasswordAuthentication() {

                 return new PasswordAuthentication(username1, password1);

             }

         });

         Message message = new MimeMessage(session);

         message.setFrom(new InternetAddress(from));

         message.setRecipients(Message.RecipientType.TO, InternetAddress.parse(to));

         message.setSubject(subject);

         Multipart multipart = new MimeMultipart("related");

         System.out.println(" html ");

         BodyPart htmlPart = new MimeBodyPart();

         htmlContent = "<img src=\"cid:image\">" + htmlContent;

         htmlPart.setContent(htmlContent, "text/html");

         multipart.addBodyPart(htmlPart);

         System.out.println(" image ");

         System.out.println("image path : " + imagePath);

         BodyPart imgPart = new MimeBodyPart();

         DataSource fds = new FileDataSource(this.imagePath);

         imgPart.setDataHandler(new DataHandler(fds));

         imgPart.setHeader("Content-ID", "<image>");

         multipart.addBodyPart(imgPart);

         message.setContent(multipart);

         Transport.send(message);

         System.out.println(" Sent -| ");

     }

     public void setTo(String to) {

         this.to = to;

     }

     public void setSubject(String subject) {

         this.subject = subject;

     }

     public void setHtmlContent(String htmlContent) {

         this.htmlContent = htmlContent;

     }

     public String getImagePath() {

         return imagePath;

     }

     public void setImagePath(String imagePath) {

         this.imagePath = imagePath;

     }

 }

SendEmailDemo.java

 public class SendEmailDemo {

     public static void main(){

         String host = "smtp.163.com";　　　　　　　　// use your smtp server host

         final String username = "sender@163.com"; // use your username

         final String password = "password"; 　　// use your password

         String from = "sender@163.com"; 　　　　// use your sender email address

         String to = "reciever@foxmail.com";　　// use your reciever email address

         try {

             EmailHelper emailHelper = new EmailHelper(host, username, password, from);

             emailHelper.setTo(to);

             emailHelper.setSubject("subject ttt test");

             emailHelper.setHtmlContent("<h1> This is html </h1>");

             emailHelper.setImagePath("/Users/grs/Documents/Java/mavenEmail/test/src/main/resource/promises.png");

             emailHelper.send();

         } catch (Exception e) {

             e.printStackTrace();

         }

     }

 }

参考资料

JavaMail API - Sending Email With Inline Imagess

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