java 创建缩略图

public class Thumbnail {
	public static void main(String[] args) throws ImageFormatException, InterruptedException, IOException {
		createThumbnail("D:\\1.png",200,200,100,"D:\\11.jpg");
	}

	private static void createThumbnail(String filename, int thumbWidth,
			int thumbHeight, int quality, String outFilename)
			throws InterruptedException, ImageFormatException, IOException {
		Image image = Toolkit.getDefaultToolkit().getImage(filename);
		MediaTracker mediaTracker = new MediaTracker(new Container());
		mediaTracker.addImage(image, 0);
		mediaTracker.waitForID(0);
		double thumbRatio = (double) thumbWidth / (double) thumbHeight;
		int imageWidth = image.getWidth(null);
		int imageHeight = image.getHeight(null);
		double imageRatio = (double) imageWidth / (double)imageHeight;
		if (thumbRatio < imageRatio)
		{
			thumbHeight = (int) (thumbWidth /imageRatio);
		} else {
			thumbWidth = (int)(thumbHeight * imageRatio);
		}
		BufferedImage thumbImage = new BufferedImage(thumbWidth, thumbHeight,BufferedImage.TYPE_INT_RGB);
		Graphics2D graphics2D = thumbImage.createGraphics();
		graphics2D.setRenderingHint(RenderingHints.KEY_INTERPOLATION,RenderingHints.VALUE_INTERPOLATION_BILINEAR);
		graphics2D.drawImage(image, 0, 0, thumbWidth, thumbHeight, null);
		BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(outFilename));
		JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
		JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(thumbImage);
		quality = Math.max(0, Math.min(quality, 100));
		param.setQuality((float) quality / 100.0f, false);
		encoder.setJPEGEncodeParam(param);
		encoder.encode(thumbImage);
		out.close();
	}
}