code: @Override
  	public Image createImage(String code) {
  		// 图像buffer
  		final BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
  		final Graphics2D g = GraphicsUtil.createGraphics(image, ObjectUtil.defaultIfNull(this.background, Color.WHITE));
  
  		// 干扰线
  		drawInterfere(g);
  
  		// 字符串
  		drawString(g, code);
  
  		return image;
  	}
docs: -------------------------------------------------------------------- Constructor end