How do I display an image in JFrame from only a ByteArrayOutputStream?

Question

I have a ByteArrayOutputStream representation of a JPEG image (although I could use GIF or PNG if that would work better). I would like to display this on the form, such as in a label or image object. I am constrained by the fact that I cannot write the image to a file, I can only ever store it in memory.

Answer 1

One of the (easiest) possibilites to solve the problem is creating a ByteArrayInputStream and then passing it to ImageIO:

ByteArrayOutputStream output = new ByteArrayOutputStream();
// save the image to the output stream
ByteArrayInputStream input = new ByteArrayInputStream(output.toByteArray());
BufferedImage image = ImageIO.read(input);