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【Java】创建文件缩略图

作者:首君 / 发布于2015/9/14/ 521

Java创建文件缩略图完整代码，可以指定缩略图的高度、宽度非常实用，已经定义成标准函数，放到你的项目里就可以直接运行


	private void createThumbnail(String filename, int thumbWidth, int thumbHeight, int quality, String outFilename)
	 throws InterruptedException, FileNotFoundException, IOException
	 {
	 // load image from filename
	 // http://www.sharejs.com
	 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();
	 }

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