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JavaMail 发送电子邮件内嵌图片

下面的一个例子,是从你的机器发送HTML电子邮件,并内嵌图像。在这里,我们使用JangoSMPT服务器通过该电子邮件被发送到我们的目标电子邮件地址。

要发送电子邮件,其中包含一个内嵌的图像,遵循的步骤是:

  • 获取一个Session

  • 创建一个默认的MimeMessage对象,并设置发件人,收件人,主题(From, To, Subject )在消息中。

  • 创建一个MimeMultipart的对象。

  • 在我们的例子中,我们将在邮件的HTML部分和图像。因此,首先创建HTML内容,并在多部分对象将其设置为:

    // first part (the html)
    BodyPart messageBodyPart = new MimeBodyPart();
    String htmlText = "<H1>Hello</H1><img src="cid:image">";
    messageBodyPart.setContent(htmlText, "text/html");
    // add it
    multipart.addBodyPart(messageBodyPart);
  • 接下来创建一个DataHandler的如下添加图像:

    // second part (the image)
    messageBodyPart = new MimeBodyPart();
    DataSource fds = new FileDataSource(
     "/home/manisha/javamail-mini-logo.png");
    
    messageBodyPart.setDataHandler(new DataHandler(fds));
    messageBodyPart.setHeader("Content-ID", "<image>");
  • 接下来设置多重如下消息中:

    message.setContent(multipart);
  • 发送使用传输对象的消息。

创建Java类

创建一个Java类文件SendInlineImagesInEmail,是其内容如下:

package com.yiibai;

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.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;

public class SendInlineImagesInEmail {
   public static void main(String[] args) {
      // Recipient's email ID needs to be mentioned.
      String to = "destinationemail@gmail.com";

      // Sender's email ID needs to be mentioned
      String from = "fromemail@gmail.com";
      final String username = "manishaspatil";//change accordingly
      final String password = "******";//change accordingly

      // Assuming you are sending email through relay.jangosmtp.net
      String host = "relay.jangosmtp.net";

      Properties props = new Properties();
      props.put("mail.smtp.auth", "true");
      props.put("mail.smtp.starttls.enable", "true");
      props.put("mail.smtp.host", host);
      props.put("mail.smtp.port", "25");

      Session session = Session.getInstance(props,
         new javax.mail.Authenticator() {
            protected PasswordAuthentication getPasswordAuthentication() {
               return new PasswordAuthentication(username, password);
            }
         });

      try {

         // Create a default MimeMessage object.
         Message message = new MimeMessage(session);

         // Set From: header field of the header.
         message.setFrom(new InternetAddress(from));

         // Set To: header field of the header.
         message.setRecipients(Message.RecipientType.TO,
            InternetAddress.parse(to));

         // Set Subject: header field
         message.setSubject("Testing Subject");

         // This mail has 2 part, the BODY and the embedded image
         MimeMultipart multipart = new MimeMultipart("related");

         // first part (the html)
         BodyPart messageBodyPart = new MimeBodyPart();
         String htmlText = "<H1>Hello</H1><img src="cid:image">";
         messageBodyPart.setContent(htmlText, "text/html");
         // add it
         multipart.addBodyPart(messageBodyPart);

         // second part (the image)
         messageBodyPart = new MimeBodyPart();
         DataSource fds = new FileDataSource(
            "/home/manisha/javamail-mini-logo.png");

         messageBodyPart.setDataHandler(new DataHandler(fds));
         messageBodyPart.setHeader("Content-ID", "<image>");

         // add image to the multipart
         multipart.addBodyPart(messageBodyPart);

         // put everything together
         message.setContent(multipart);
         // Send message
         Transport.send(message);

         System.out.println("Sent message successfully....");

      } catch (MessagingException e) {
         throw new RuntimeException(e);
      }
   }
}

由于我们使用的是由主机提供商JangoSMTP提供的SMTP服务器,我们需要验证用户名和密码。javax.mail.PasswordAuthentication类用于验证的密码。

编译并运行

现在,我们班是准备好了,让我们编译上面的类。我已经保存了类SendInlineImagesInEmail.java 目录: /home/manisha/JavaMailAPIExercise. 我们需要 javax.mail.jar 和 activation.jar 文件在 classpath 中。执行下面的命令从命令提示符编译类(两个罐子被放置在/home/manisha/ 目录下):

javac -cp /home/manisha/activation.jar:/home/manisha/javax.mail.jar: SendInlineImagesInEmail.java

现在,这个类被编译,执行下面的命令来运行:

java -cp /home/manisha/activation.jar:/home/manisha/javax.mail.jar: SendInlineImagesInEmail

验证输出

应该看到下面的消息命令控制台上:

Sent message successfully....

因为我通过JangoSMTP发送邮件到我的Gmail地址,下面的邮件会在我的Gmail帐户的收件箱中接收:

JavaMail API Send Email With Inline Images