Java: BufferedImage to byte array and back
This is recommended to convert to a byte array
ByteArrayOutputStream baos = new ByteArrayOutputStream();ImageIO.write(img, "jpg", baos);byte[] bytes = baos.toByteArray();
Note that calling close or flush will do nothing, you can see this for yourself by looking at their source/doc:
Closing a ByteArrayOutputStream has no effect.
The flush method of OutputStream does nothing.
Thus use something like this:
ByteArrayOutputStream baos = new ByteArrayOutputStream(THINK_ABOUT_SIZE_HINT);boolean foundWriter = ImageIO.write(bufferedImage, "jpg", baos);assert foundWriter; // Not sure about this... with jpg it may work but other formats ?byte[] bytes = baos.toByteArray();Here are a few links concerning the size hint:
Of course always read the source code and docs of the version you are using, do not rely blindly on SO answers.