code: public static BufferedImage toImage(String base64) throws IORuntimeException {
  		byte[] decode = Base64.decode(base64, CharsetUtil.CHARSET_UTF_8);
  		return toImage(decode);
  	}
docs: 将Base64编码的图像信息转为 {@link BufferedImage}
  
  @param base64 图像的Base64表示
  @return {@link BufferedImage}
  @throws IORuntimeException IO异常