Java – convert data URL to bufferedimage

I have a data URL for an image file and must pass it to another function Along the path from the data URL to the buffered image, it needs to be a bytearray

My approach is as follows:

String dataUrl;
byte[] imageData = dataUrl.getBytes();

// pass the byteArray along the path

// create BufferedImage from byteArray
BufferedImage inputImage = ImageIO.read(new ByteArrayInputStream(imageData));

// If the picture is null,then throw an unsupported image exception.
if (inputImage == null) {
    throw new UnkNownImageFormatException();
}

The problem is that it always throws an unknownimageformatexception exception, which means inputimage is null, which means imageio Read does not recognize imagetype

I use imageio Getreaderformatnames() gets the supported file names and the following list:

Supported Formats: 
jpg,BMP,bmp,JPG,jpeg,wbmp,png,JPEG,PNG,WBMP,GIF,gif

The dataurl I tried to pass is similar to: data: image / PNG; Base64,... Or data: image / JPG; base64,…

As far as I know, those in the list of supported files should be recognized

In this case, inputimage may also be null? More interestingly, how can I solve it?

Solution

As the review has said, the image data is Base64 encoded To retrieve binary data, you must split the type / encoding terminal and then decode the base64 content into binary data

String encodingPrefix = "base64,";
int contentStartIndex = dataUrl.indexOf(encodingPrefix) + encodingPrefix.length();
byte[] imageData = Base64.decodeBase64(dataUrl.substring(contentStartIndex));

I use org. From Apache common codec apache. commons. codec. binary. Base64, other Base64 decoders should also work