使用Java在电子邮件正文中发送图像

问题描述

我已经能够使用Java在电子邮件中发送图像作为附件。我现在试图在电子邮件正文中发送相同的图像像这样：

  public static void main（String [] args）抛出NoSuchProviderException，MessagingException {
 System.out.println（发送邮件...）; 
属性props = new Properties（）; 
 props.setProperty（mail.smtp.starttls.enable，true）; 
 props.setProperty（mail.transport.protocol，smtp）; 
 props.setProperty（mail.smtp.auth，true）; 
 props.setProperty（mail.smtp.host，smtp.gmail.com）; 
 
 props.setProperty（mail.smtp.port，587）; 
 props.setProperty（mail.smtp.user，mysusername）; 
 props.setProperty（mail.smtp.password，mypassword）; 
 
会话mailSession = Session.getDefaultInstance（props，null）; 
 mailSession.setDebug（true）; 
 Transport transport = mailSession.getTransport（）; 
 
 MimeMessage message = new MimeMessage（mailSession）; 
 message.setSubject（带图像的HTML邮件）; 
 message.setFrom（new InternetAddress（[email protected]））; 
 message.setContent 
（< h1>这是测试< / h1>
 +< img src = \C：/ Users / pc / Desktop / Photos /Shammah.PNG\\">，
text / html）; 
 message.addRecipient（Message.RecipientType.TO，
 new InternetAddress（[email protected]））; 
 
 transport.connect（）; //这是第46行
 transport.sendMessage（message，
 message.getRecipients（Message.RecipientType.TO））; 
 transport.close（）; 
} 
  

我得到这个输出：

 发送邮件... 
 DEBUG：setDebug：JavaMail版本1.4ea 
 DEBUG：getProvider（）返回javax.mail.Provider [TRANSPORT，smtp ，com.sun.mail.smtp.SMTPTransport，Sun Microsystems，Inc] 
 DEBUG SMTP：useEhlo true，useAuth true 
线程main中的异常javax.mail.AuthenticationFailedException $ javax中的
。 mail.Service.connect（Service.java:306）
在javax.mail.Service.connect（Service.java:156）
在javax.mail.Service.connect（Service.java:105） 
 at image.in.body.ImageInBody.main（ImageInBody.java:46）
 Java结果：1 
  

为什么当我为我的Gmail帐户使用正确的用户名和密码时，身份验证失败？

解决方案

您需要像这样声明您的图片：

 < img src =cid：unique-name-or-id /> 
  

将图像加载为MimeBodyPart，并将唯一名称或ID与MimeBodyPart的FileName相匹配。

I have been able to send Image as an Attachment in an Email using Java. I am now trying to send the same image in the Email Body Like this:

public static void main(String[] args) throws NoSuchProviderException, MessagingException {
    System.out.println("Sending mail...");
    Properties props = new Properties();
    props.setProperty("mail.smtp.starttls.enable", "true");
    props.setProperty("mail.transport.protocol", "smtp");
    props.setProperty("mail.smtp.auth", "true");
    props.setProperty("mail.smtp.host", "smtp.gmail.com");

props.setProperty("mail.smtp.port", "587");
    props.setProperty("mail.smtp.user", "mysusername");
    props.setProperty("mail.smtp.password", "mypassword");

    Session mailSession = Session.getDefaultInstance(props, null);
    mailSession.setDebug(true);
    Transport transport = mailSession.getTransport();

    MimeMessage message = new MimeMessage(mailSession);
    message.setSubject("HTML  mail with images");
    message.setFrom(new InternetAddress("[email protected]"));
    message.setContent
      ("<h1>This is a test</h1>"
       + "<img src=\"C:/Users/pc/Desktop/Photos/Shammah.PNG\">",
       "text/html");
    message.addRecipient(Message.RecipientType.TO,
         new InternetAddress("[email protected]"));

    transport.connect();//This is line 46
    transport.sendMessage(message,
        message.getRecipients(Message.RecipientType.TO));
    transport.close();
}

I am getting this output:

Sending mail...
DEBUG: setDebug: JavaMail version 1.4ea
DEBUG: getProvider() returning        javax.mail.Provider[TRANSPORT,smtp,com.sun.mail.smtp.SMTPTransport,Sun Microsystems, Inc]
DEBUG SMTP: useEhlo true, useAuth true
Exception in thread "main" javax.mail.AuthenticationFailedException
at javax.mail.Service.connect(Service.java:306)
at javax.mail.Service.connect(Service.java:156)
at javax.mail.Service.connect(Service.java:105)
at image.in.body.ImageInBody.main(ImageInBody.java:46)
Java Result: 1

Why is authentication failing while I am using the correct username and Password for My Gmail account?

解决方案

You need to declare your images like this :

<img src="cid:unique-name-or-id" />

Load images as MimeBodyPart and match the unique-name-or-id with the FileName of the MimeBodyPart.

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