獲取圖像的JPEG渲染的內存中表示

Question

我需要知道如何從Java中加載的圖像獲取字節數組。 BufferedImage似乎不提供任何生成字節數組的方法，那麼我該如何使用？

Answer 1

BufferedImage bufferedImage; //assumed that you have created it already 
ByteArrayOutputStream byteStream = new ByteArrayOutputStream(); 
ImageIO.write(bufferedImage,"jpg", byteStream); 
byte[] byteArray = byteStream.toByteArray();