Java Mail Base64编码的图像附件字符串 [英] java mail Base64 encoded string to image attachment

问题描述

我有一个base64编码的字符串，该字符串使用JSON发布到Spring表单中.

I have a base64 encoded string which is posted using JSON into a Spring form.

data:image/png;base64,iVBORw0KGg......etc

我想将此图像添加为电子邮件的附件.附加文件可以很好地工作，但是只是将base64字符串添加为附件.

I want to add this image as an attachment to an email. Attaching the file works fine, but it is just adding the base64 string as the attachment.

我正在使用以下代码创建附件部分.

I am using the following code to create the attachment part.

private MimeBodyPart addAttachment(final String fileName, final String fileContent) throws MessagingException {

    if (fileName == null || fileContent == null) {
        return null;
    }

    LOG.debug("addAttachment()");

    MimeBodyPart filePart = new MimeBodyPart();

    String data = fileContent;
    DataSource ds;
    ds = new ByteArrayDataSource(data.getBytes(), "image/*");

    // "image/*"
    filePart.setDataHandler(new DataHandler(ds));
    filePart.setFileName(fileName);

    LOG.debug("addAttachment success !");

    return filePart;

}

我也尝试过

 ds = new ByteArrayDataSource(data, "image/*");

如何使用ByteArrayDataSource将base64字符串转换为正确的图像文件?

How can I convert the base64 string into a proper image file using the ByteArrayDataSource ?

推荐答案

您将必须首先使用Base64解码器.使用Java 8，您可以做到:

You'll hav to use a Base64-decoder first. With Java 8 you could do:

byte[] imgBytes = Base64.getDecoder().decode(base64String);

使用较旧的Java版本，您将不得不使用apache commons-codec之类的库-周围有很多这样的库.

With older java-versions you'll have to use some library like apache commons-codec or something - there's lots of those around.

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