code: public static InputStream toMarkSupportStream(InputStream in) {
  		if (null == in) {
  			return null;
  		}
  		if (false == in.markSupported()) {
  			return new BufferedInputStream(in);
  		}
  		return in;
  	}
docs: 将{@link InputStream}转换为支持mark标记的流<br>
  若原流支持mark标记，则返回原流，否则使用{@link BufferedInputStream} 包装之
  
  @param in 流
  @return {@link InputStream}
  @since 4.0.9