个性二维码不落地生成：报错

问题解决，已经可以把logo添加到二维码中间，但是。。。特么的logo是黑白色的啊 

	/**
	 * 将照片logo添加到二维码中间
	 * @param matrix
	 * @param format
	 * @param stream
	 * @param logoPath
	 * @throws IOException
	 */
	public void overlapImage(BitMatrix matrix, String format, OutputStream stream, String logoPath) throws IOException {
		BufferedImage image = MatrixToImageWriter.toBufferedImage(matrix, DEFAULT_CONFIG);
		BufferedImage logo = ImageIO.read(new File(logoPath));
		Graphics2D g = image.createGraphics();
		// 考虑到logo照片贴到二维码中，建议大小不要超过二维码的1/5;
		int width = image.getWidth() / 3;
		int height = image.getHeight() / 3;
		// logo起始位置，此目的是为logo居中显示
		int x = (image.getWidth() - width) / 2;
		int y = (image.getHeight() - height) / 2;
		// 绘制图
		g.drawImage(logo, x, y, width, height, null);
		g.dispose();// 清理内存中的图片，返还内存给系统
		// 输出二维码
		ImageIO.write(image, format, stream);
	}