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【Java】创建缩略图
作者:xunzhen245 / 发布于2013/10/23/ 467

	private void createThumbnail(String filename, int thumbWidth,

	int thumbHeight, int
	quality, String outFilename)

	throws InterruptedException,

	FileNotFoundException, IOException {

	// load image from

	filename Image image =

	Toolkit.getDefaultToolkit().getImage(filename);

	MediaTracker mediaTracker = new

	MediaTracker(new Container());

	mediaTracker.addImage(image,

	0); mediaTracker.waitForID(0);

	// use this to test for errors at

	this point: System.out.println
	(mediaTracker.isErrorAny()); // determine thumbnail size from

	WIDTH and HEIGHT 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);

	} // draw original image to thumbnail

	image object and //

	scale it to the new size on-the-fly

	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); // save thumbnail image to

	outFilename 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

	(); }
	private void createThumbnail(String filename, int thumbWidth, int

	thumbHeight, int
	quality, String outFilename)throws InterruptedException,

	FileNotFoundException, IOException{// load image from

	filenameImage image = Toolkit.getDefaultToolkit().getImage

	(filename);MediaTracker mediaTracker = new MediaTracker(new

	Container());mediaTracker.addImage(image,

	0);mediaTracker.waitForID(0);// use this to test

	for errors at this point: System.out.println
	(mediaTracker.isErrorAny());
	// determine thumbnail size from WIDTH and

	HEIGHTdouble 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);}
	// draw original image to thumbnail image object

	and// scale it to the new size on-the-

	flyBufferedImage thumbImage = new BufferedImage(thumbWidth,
	thumbHeight, BufferedImage.TYPE_INT_RGB);Graphics2D graphics2D =

	thumbImage.createGraphics();graphics2D.setRenderingHint

	(RenderingHints.KEY_INTERPOLATION,
	RenderingHints.VALUE_INTERPOLATION_BILINEAR);graphics2D.drawImag

	e(image, 0, 0, thumbWidth, thumbHeight, null);
	// save thumbnail image to

	outFilenameBufferedOutputStream 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

	();}
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