Java不能发送包含图像的HTML电子邮件 [英] Java cannot send email with html with images

问题描述

我试图用包含两个图像的html发送电子邮件。这两个图像是从AngularJS客户端以base64字符串形式发送的，如下所示：

  data：image / png; base64，iVBORw0KGgoAAAANSUhEUgAAA + gAAALuCAYAAAA9jTxNAAAgAElEQ 
  

请注意，我截断了base64字符串太长。

  String temp = baseString.split（，）[1]; 
 byte [] tile = DatatypeConverter.parseBase64Binary（temp）; 
 
 BodyPart messageBodyPart = new MimeBodyPart（）; 
 InputStream inputStream = new ByteArrayInputStream（tile）; 
 DataHandler dataHandler = new DataHandler（new InputStreamDataSource（inputStream））; 
 messageBodyPart.setDataHandler（dataHandler）; 
 messageBodyPart.setHeader（Content-ID，< image>）; 
 multipart.addBodyPart（messageBodyPart）; 
  

InputStreamDataSource：

  public class InputStreamDataSource implements DataSource {
 
 private InputStream inputStream; 
 
 public InputStreamDataSource（InputStream inputStream）{
 this.inputStream = inputStream; 
} 
 
 public InputStream getInputStream（）{
 return inputStream; 
} 
 $ b $ public OutputStream getOutputStream（）throws IOException {
 throw new UnsupportedOperationException（Not implemented）; 
} 
 
 public String getContentType（）{
 return* / *; 
} 
 
 public String getName（）{
 returnInputStreamDataSource; 
 
 
  

邮件中没有显示图片。

但是，当我使用 FileDataSource 而不是base64字符串时它工作得很好：

  DataSource fds = new FileDataSource（D：\\Projects\\Extras\\sofa1.png）; 
 messageBodyPart.setDataHandler（new DataHandler（fds））; 
 messageBodyPart.setHeader（Content-ID，< image>）; 
 multipart.addBodyPart（messageBodyPart）; 
  

这可以正常工作并显示图像。

<有人请帮我解决这个问题。 使用 /util/ByteArrayDataSource.htmlrel =nofollow noreferrer> ByteArrayDataSource 而不是您自己的InputStreamDataSource。

您的代码只显示一个图像;希望你为每个图像使用不同的内容ID。

你的代码也不应该如何HTML内容引用图像;希望它使用正确的cid：URL。

JavaMail FAQ有更多关于如何发送包含图片的邮件。

I am trying to send email with html which has two images. The two images are sent from the AngularJS client side as base64 strings and looks like:

data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAA+gAAALuCAYAAAA9jTxNAAAgAElEQ

Note that I have truncated the base64 string as its too long.

String temp = baseString.split(",")[1];
byte[] tile = DatatypeConverter.parseBase64Binary(temp);

BodyPart messageBodyPart = new MimeBodyPart();
InputStream inputStream = new ByteArrayInputStream(tile);
DataHandler dataHandler = new DataHandler(new InputStreamDataSource(inputStream));
messageBodyPart.setDataHandler(dataHandler);
messageBodyPart.setHeader("Content-ID", "<image>");
multipart.addBodyPart(messageBodyPart);

The InputStreamDataSource:

public class InputStreamDataSource implements DataSource {

    private InputStream inputStream;

    public InputStreamDataSource(InputStream inputStream) {
        this.inputStream = inputStream;
    }

    public InputStream getInputStream() {
        return inputStream;
    }

    public OutputStream getOutputStream() throws IOException {
        throw new UnsupportedOperationException("Not implemented");
    }

    public String getContentType() {
        return "*/*";
    }

    public String getName() {
        return "InputStreamDataSource";
    }
}

The image does not show up in the mail.

But it works perfectly fine when I use a FileDataSource instead of base64 string:

    DataSource fds = new FileDataSource("D:\\Projects\\Extras\\sofa1.png");
    messageBodyPart.setDataHandler(new DataHandler(fds));
    messageBodyPart.setHeader("Content-ID", "<image>");
    multipart.addBodyPart(messageBodyPart);

This works fine and shows the images.

Someone please help me fix this.

解决方案

Use ByteArrayDataSource instead of your own InputStreamDataSource.

Your code only shows one image; hopefully you're using different Content-IDs for each image.

Your code also doesn't should how the html content is referencing the images; hopefully it's using the correct "cid:" URL.

The JavaMail FAQ has more information on how to send messages that include images.

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