将 byte[] 转换为数据 URI 的 Base64 字符串 [英] Convert byte[] to Base64 string for data URI

问题描述

我知道这可能已经被问了 10000 次，但是，我似乎无法找到这个问题的直接答案.

I know this has probably been asked 10000 times, however, I can't seem to find a straight answer to the question.

我的数据库中存储了一个代表图像的 LOB；我从数据库中获取该图像，我想通过 HTML IMG 标记在网页上显示它.这不是我的首选解决方案，但在我找到更好的解决方案之前，这是一个权宜之计.

I have a LOB stored in my db that represents an image; I am getting that image from the DB and I would like to show it on a web page via the HTML IMG tag. This isn't my preferred solution, but it's a stop-gap implementation until I can find a better solution.

我正在尝试通过以下方式使用 Apache Commons Codec 将 byte[] 转换为 Base64:

I'm trying to convert the byte[] to Base64 using the Apache Commons Codec in the following way:

String base64String = Base64.encodeBase64String({my byte[]});

然后，我试图在我的页面上显示我的图像，如下所示:

Then, I am trying to show my image on my page like this:

<img src="data:image/jpg;base64,{base64String from above}"/>

它显示的是浏览器默认的我找不到这个图片"，图片.

It's displaying the browser's default "I cannot find this image", image.

有人有什么想法吗?

谢谢.

推荐答案

我使用了这个并且效果很好(与接受的答案相反，它使用了不推荐用于这种情况的格式):

I used this and it worked fine (contrary to the accepted answer, which uses a format not recommended for this scenario):

StringBuilder sb = new StringBuilder();
sb.append("data:image/png;base64,");
sb.append(StringUtils.newStringUtf8(Base64.encodeBase64(imageByteArray, false)));
contourChart = sb.toString();

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