java中对图片按比例缩放

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需要对图片进行处理，使之能够适当的显示在画面中。找到一些资料后，处理也比较简单代码：

public static Icon getFixedBoundIcon(String filePath, int height, int width) throws Exception{
          double Ratio=0.0; //缩放比例
          File F = new File(filePath);
          if (!F.isFile())
                  throw new Exception(F+" is not image file error in getFixedBoundIcon!");
          Icon ret = new ImageIcon(filePath);
          BufferedImage Bi = ImageIO.read(F);
          if ((Bi.getHeight()>height) || (Bi.getWidth()>width)){
                  if (Bi.getHeight()>Bi.getWidth()){
                          Ratio = (new Integer(height)).doubleValue() /Bi.getHeight();
                  } else {
                          Ratio = (new Integer(width)).doubleValue()/Bi.getWidth();
                  } File ThF = new File(filePath+"_"+height +"_"+width);
                  Image Itemp = Bi.getScaledInstance (width,height,Bi.SCALE_SMOOTH);
                  AffineTransformOp op = new AffineTransformOp(AffineTransform.getScaleInstance(Ratio, Ratio), null);
                  Itemp = op.filter(Bi, null);
                  try {
                          ImageIO.write((BufferedImage)Itemp, "jpg", ThF);
                          ret = new ImageIcon(ThF.getPath());
                  }catch (Exception ex) {

                  }
          }
          return ret;
}