java 缩放图片

 BufferedImage bufTarget = null;
          GetImage(srcPath,width,height);
        
          double sx = (double) width / bufImage.getWidth();
          double sy = (double) height / bufImage.getHeight();
          
          int type = bufImage.getType();
          if(type == BufferedImage.TYPE_CUSTOM){
           ColorModel cm = bufImage.getColorModel();
           WritableRaster raster = cm.createCompatibleWritableRaster(width,
             height);
           boolean alphaPremultiplied = cm.isAlphaPremultiplied();
           bufTarget = new BufferedImage(cm, raster, alphaPremultiplied, null);
          }else
           bufTarget = new BufferedImage(width, height, type);
          
          Graphics2D g = bufTarget.createGraphics();
          g.setRenderingHint(RenderingHints.KEY_RENDERING,
            RenderingHints.VALUE_RENDER_QUALITY);
          g.drawRenderedImage(bufImage, AffineTransform.getScaleInstance(sx, sy));
          g.dispose();
          return bufTarget;