Java处理图片

/**
     * @param fromFileStr 源图片路径
     * @param saveToFileStr 目标图片目录
     * @param sysimgfile 目标图片名（不带图片后缀）
     * @param suffix 目标图片后缀
     * @param width 目标图片宽
     * @param height 目标图片高
     * @throws Exception
     * @author 李敏
     */
    public static void createThumbnail(String fromFileStr,
            String saveToFileStr, String sysimgfile, String suffix, int width,
            int height) throws Exception {
        double Ratio = 0.0;
        File F = new File(fromFileStr);
        if (!F.isFile())
            throw new Exception(F
                    + " is not image file error in CreateThumbnail!");
        File ThF = new File(saveToFileStr, sysimgfile + "." + suffix);
        BufferedImage Bi = ImageIO.read(F);
        Image Itemp = Bi.getScaledInstance(width, height, Bi.SCALE_SMOOTH);
        if ((Bi.getHeight() > width) || (Bi.getWidth() > height)) {
            if (Bi.getHeight() > Bi.getWidth())
                Ratio = (double) width / Bi.getHeight();
            else
                Ratio = (double) height / Bi.getWidth();
        }
        AffineTransformOp op = new AffineTransformOp(AffineTransform
                .getScaleInstance(Ratio, Ratio), null);
        Itemp = op.filter(Bi, null);
        try {
            ImageIO.write((BufferedImage) Itemp, suffix, ThF);
        } catch (Exception ex) {
            throw new Exception(" ImageIo.write error in CreatThum.: "
                    + ex.getMessage());
        }
    }