我正在调整图像的大小,我需要返回一个 InputStream 对象
public InputStream resize(InputStream input, int maxSize){
BufferedImage image = ImageIO.read(input);
double scale = (double) image.getWidth()/maxSize;
Image scaledImage = image.getScaledInstance( (int) (image.getWidth() * scale), (int) (image.getHeight() * scale), Image.SCALE_SMOOTH);
InputStream ret = (InputStream) scaledImage;//this is wrong cast
retrun ret;
}
如何将图像转换为 InputStream?
最佳答案
您可以使用此代码进行转换:
BufferedImage bufferedImage = new BufferedImage(image.getWidth(null), image.getHeight(null), BufferedImage.TYPE_INT_RGB);
//bufferedImage is the RenderedImage to be written
Graphics2D g2 = bufferedImage.createGraphics();
g2.drawImage(image, null, null);
ByteArrayOutputStream outStream = new ByteArrayOutputStream();
ImageIO.write(bufferedImage, "jpg", outStream);
InputStream is = new ByteArrayInputStream(outStream.toByteArray());
关于java.io.Image 到 InputStream,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/25505792/