How to convert BufferedImage to InputStream?

Question

I am uploading images using servlet. To perform resize operations i am converting InputStream to BufferedImage. Now i want to save it in mongoDB. Since, i am new to mongoDB as far as i know, GridFS takes InputStream.

So, is there any way to convert BufferedImage to InputStream?

Answer 1

BufferedImage ➙ ByteArrayOutputStream ➙ byte[] ➙ ByteArrayInputStream

Use the ImageIO.write method to make a BufferedImage (which is a RenderedImage) into a ByteArrayOutputStream. From there get a byte array (byte[]), feeding that into an InputStream of type ByteArrayInputStream.

ByteArrayOutputStream os = new ByteArrayOutputStream();
ImageIO.write(buffImage, "jpeg", os);                          // Passing: ​(RenderedImage im, String formatName, OutputStream output)
InputStream is = new ByteArrayInputStream(os.toByteArray());

Both the ByteArrayOutputStream and InputStream implement AutoCloseable. So you can conveniently have those closed automatically by using try-with-resources syntax.

Answer 2

First of all you must get your "bytes":

byte[] buffer = ((DataBufferByte)(bufferedImage).getRaster().getDataBuffer()).getData();

And then use ByteArrayInputStream(byte[] buf) constructor to create your InputStream;

Answer 3

You need to save the BufferedImage to a ByteArrayOutputStream using the ImageIO class, then create a ByteArrayInputStream from toByteArray().

Answer 4

By overriding the method toByteArray(), returning the buf itself (not copying), you can avoid memory related problems. This will share the same array, and not creating another of the correct size. The important thing is to use the size() method in order to control the number of valid bytes into the array.

final ByteArrayOutputStream output = new ByteArrayOutputStream() {
    @Override
    public synchronized byte[] toByteArray() {
        return this.buf;
    }
};
ImageIO.write(image, "png", output);
return new ByteArrayInputStream(output.toByteArray(), 0, output.size());