Java实现图片水印效果

    /**     * 图片添加水印效果     * @param filename 图片文件名称     * @param resultFilename 目标文件名称     * @throws IOException      */    public void watermarkForImage(String filename,String resultFilename) throws IOException{        //创建文件对象        File file = new File(filename);        //判断文件是否存在        if (!file.exists()) {            System.out.println("文件不存在");            return;        }        ImageIcon imageIcon = new ImageIcon(file.getPath());        BufferedImage bufferedImage = new BufferedImage(                imageIcon.getIconWidth(), imageIcon.getIconHeight(), BufferedImage.TYPE_INT_BGR);        Graphics2D graphics2d = (Graphics2D)bufferedImage.getGraphics();        graphics2d.drawImage(imageIcon.getImage(), 0, 0, null);        AlphaComposite alphaComposite = AlphaComposite.getInstance(AlphaComposite.SRC_OVER,1f);        graphics2d.setComposite(alphaComposite);        //设置颜色        graphics2d.setColor(Color.WHITE);        graphics2d.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);        //字体设置        graphics2d.setFont(new Font("微软雅黑", Font.BOLD, 32));        //水印文字        String watermarkText = "水印效果测试";        //设置水印文字和文字        graphics2d.drawString(watermarkText, 0, 32);        graphics2d.dispose();        File resultFile = new File(resultFilename);        ImageIO.write(bufferedImage, "png", resultFile);        System.out.println("success!");    }