给图片添加文字水印并铺满图片

/**
 * 为图片添加水印
 *
 * @param input 图片文件本地路径
 * @param output
 * @param waterText
 * @throws IOException
 * @throws PanshengException
 */
public static void watermarkImage(String input, String output, List<String> waterText) throws IOException, PanshengException {
    File srcImageFile = new File(input);
    if (!srcImageFile.exists())
        throw new PanshengException("源图片文件不存在：" + input);
    Image srcImage = ImageIO.read(srcImageFile);

    int srcWidth = srcImage.getWidth(null);//获取图片的宽
    int srcHeight = srcImage.getHeight(null);//获取图片的高
    //原图片
    BufferedImage bufferedImage = new BufferedImage(srcWidth, srcHeight, BufferedImage.TYPE_INT_RGB);
    //得画笔
    Graphics2D g = bufferedImage.createGraphics();
    //设置对线段的锯齿状边缘处理
    g.setRenderingHint(RenderingHints.KEY_INTERPOLATION,RenderingHints.VALUE_INTERPOLATION_BILINEAR);
    g.drawImage(srcImage, 0, 0, srcWidth, srcHeight, null);
    //设置倾斜角度
    g.rotate(Math.toRadians(-30),
            (double) bufferedImage.getWidth() / 2, (double) bufferedImage
                    .getHeight() / 2);
    //设置颜色和字体
    g.setColor(Color.LIGHT_GRAY);
   g.setFont(new Font("宋体",Font.BOLD,20));
    //设置文字的透明度
    g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP,0.3f));
    //水印的坐标
    int x=srcWidth/3;
    int y=srcHeight/9;
    //画水印
    int waterSize = 0;
    for (int j = 7; j > -1; j--) {
        if (waterSize >= waterText.size()) {
                waterSize = 0;
        }
        for (int k = 2; k > -1; k--) {
            if (j % 2 != 0) {
                g.drawString(waterText.get(waterSize), x * k + x / 4,
                        y * j + y / 4);
            } else {
                g.drawString(waterText.get(waterSize), x * k + x / 6,
                        y * j + y / 4);
            }
        }
        waterSize++;
    }
    //释放资源
    g.dispose();
    //向目标路径输出图像
    FileOutputStream outputStream = new FileOutputStream(output);
    ImageIO.write(bufferedImage, "jpg", outputStream);
    outputStream.flush();
    outputStream.close();
}