code: public static void decodeToStream(String base64, OutputStream out, boolean isCloseOut) {
  		IoUtil.write(out, isCloseOut, Base64Decoder.decode(base64));
  	}
docs: base64解码
  
  @param base64 被解码的base64字符串
  @param out 写出到的流
  @param isCloseOut 是否关闭输出流
  @since 4.0.9