java建立縮圖

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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(); }

java建立縮圖