来自：http://cping1982.blog.51cto.com/601635/130066/

原创作品，允许转载，转载时请务必以超链接形式标明文章 原始出处 、作者信息和本声明。否则将追究法律责任。http://cping1982.blog.51cto.com/601635/130066

老生常谈了，直接看代码。

bufferedimage.getColorModel().getTransparency()以获得原始图片透明度用于生成缓存图，在缓存图进行相应操作即可。

/**
     * 旋转图片为指定角度
     * 
     * @param bufferedimage
     *            目标图像
     * @param degree
     *            旋转角度
     * @return
     */
    public static BufferedImage rotateImage(final BufferedImage bufferedimage,
            final int degree) {
        int w = bufferedimage.getWidth();
        int h = bufferedimage.getHeight();
        int type = bufferedimage.getColorModel().getTransparency();
        BufferedImage img;
        Graphics2D graphics2d;
        (graphics2d = (img = new BufferedImage(w, h, type))
                .createGraphics()).setRenderingHint(
                RenderingHints.KEY_INTERPOLATION,
                RenderingHints.VALUE_INTERPOLATION_BILINEAR);
        graphics2d.rotate(Math.toRadians(degree), w / 2, h / 2);
        graphics2d.drawImage(bufferedimage, 0, 0, null);
        graphics2d.dispose();
        return img;
    }

    /**
     * 变更图像为指定大小
     * 
     * @param bufferedimage
     *            目标图像
     * @param w
     *            宽
     * @param h
     *            高
     * @return
     */
    public static BufferedImage resizeImage(final BufferedImage bufferedimage,
            final int w, final int h) {
        int type = bufferedimage.getColorModel().getTransparency();
        BufferedImage img;
        Graphics2D graphics2d;
        (graphics2d = (img = createImage(w, h, type))
                .createGraphics()).setRenderingHint(
                RenderingHints.KEY_INTERPOLATION,
                RenderingHints.VALUE_INTERPOLATION_BILINEAR);
        graphics2d.drawImage(bufferedimage, 0, 0, w, h, 0, 0, bufferedimage
                .getWidth(), bufferedimage.getHeight(), null);
        graphics2d.dispose();
        return img;
    }

    /**
     * 水平翻转图像
     * 
     * @param bufferedimage 目标图像
     * @return
     */
    public static BufferedImage flipImage(final BufferedImage bufferedimage) {
        int w = bufferedimage.getWidth();
        int h = bufferedimage.getHeight();
        BufferedImage img;
        Graphics2D graphics2d;
        (graphics2d = (img = createImage(w, h, bufferedimage
                .getColorModel().getTransparency())).createGraphics())
                .drawImage(bufferedimage, 0, 0, w, h, w, 0, 0, h, null);
        graphics2d.dispose();
        return img;
    }

本文出自 “Java究竟怎么玩” 博客，请务必保留此出处http://cping1982.blog.51cto.com/601635/130066

（转）Java中Image的水平翻转、缩放与自由旋转操作