使用java邮件将图像嵌入到html电子邮件中

我正在使用javamail发送html和图像，但由于某种原因，我没有看到图像作为html的一部分，我只看到它们作为附件。我不知道这是为什么。这是我的一个用户收到电子邮件时的样子：

我还想提一下，这就是html的样子：

private String generateActivationLinkTemplate() {
    String htmlText = "";
htmlText ="<table width=\"600\" border=\"0\" cellspacing=\"0\" cellpadding=\"0\">  <tr>    <td><img src=\"cid:logoimg\"/></td>  </tr>  <tr>    <td height=\"220\"> <p>Thanks for Joining Site.com</p>      <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum. </p>    <p>Username:<br />      Password: </p>    <p>To confirm your email click <a href=\"#\">here</a>.</p></td>  </tr>  <tr>    <td height=\"50\" align=\"center\" valign=\"middle\" bgcolor=\"#CCCCCC\">www.site.com | contact@site.com | +38200 123 456</td>  </tr></table>";}

我需要一个html，body和一个头部标签吗？

这是java实现的样子：

@Stateless(name = "ejbs/EmailServiceEJB")
public class EmailServiceEJB implements IEmailServiceEJB {

@Resource(name = "mail/myMailSession")
private Session mailSession;

public void sendAccountActivationLinkToBuyer(String destinationEmail,
        String name) {

    // Destination of the email
    String to = destinationEmail;
    String from = "dontreply2thismessage@gmail.com";

    try {
        Message message = new MimeMessage(mailSession);
        // From: is our service
        message.setFrom(new InternetAddress(from));
        // To: destination given
        message.setRecipients(Message.RecipientType.TO,
                InternetAddress.parse(to));
        message.setSubject("Uspijesna registracija");
        // How to found at http://www.rgagnon.com/javadetails/java-0321.html
        message.setContent(generateActivationLinkTemplate(), "text/html");

        Date timeStamp = new Date();
        message.setSentDate(timeStamp);

        // Prepare a multipart HTML
        Multipart multipart = new MimeMultipart();
        // Prepare the HTML
        BodyPart htmlPart = new MimeBodyPart();
        htmlPart.setContent(generateActivationLinkTemplate(), "text/html");

        // PREPARE THE IMAGE
        BodyPart imgPart = new MimeBodyPart();

        String fileName = "logoemailtemplate.png";

        ClassLoader classLoader = Thread.currentThread()
                .getContextClassLoader();
        if (classLoader == null) {
            classLoader = this.getClass().getClassLoader();
            if (classLoader == null) {
                System.out.println("IT IS NULL AGAIN!!!!");
            }
        }

        DataSource ds = new URLDataSource(classLoader.getResource(fileName));

        imgPart.setDataHandler(new DataHandler(ds));
        imgPart.setHeader("Content-ID", "logoimg");

        multipart.addBodyPart(imgPart);
        multipart.addBodyPart(htmlPart);            

        // Set the message content!
        message.setContent(multipart);

        Transport.send(message);

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

}

我认为java部分对我来说看起来很好，但我怀疑只有html标记，我有问题吗？我认为img标签无法正常工作，并且没有原因图像没有出现在电子邮件上（请注意，它仅显示为附件）：

<img src=\"cid:logoimg\"/>