java - 如何从 BufferedImage 中获取 InputStream？

Question

如何从 BufferedImage 对象中获取 InputStream？我试过了，但 ImageIO.createImageInputStream() 总是返回 NULL

BufferedImage bigImage = GraphicsUtilities.createThumbnail(ImageIO.read(file), 300);
ImageInputStream bigInputStream = ImageIO.createImageInputStream(bigImage);

图像缩略图正在正确生成，因为我可以成功地将 bigImage 绘制到 JPanel。

Answer 1

来自 http://usna86-techbits.blogspot.com/2010/01/inputstream-from-url-bufferedimage.html

效果很好!

Here is how you can make an InputStream for a BufferedImage:

URL url = new URL("http://www.google.com/intl/en_ALL/images/logo.gif");
BufferedImage image = ImageIO.read(url);
ByteArrayOutputStream os = new ByteArrayOutputStream();
ImageIO.write(image, "gif", os);
InputStream is = new ByteArrayInputStream(os.toByteArray());