JSONArray jsonArray = new JSONArray();
for (OFStatistics ofst : ofs) {
OFAggregateStatisticsReply st = (OFAggregateStatisticsReply) ofst;
JSONObject jsonObject = new JSONObject();
jsonObject.put("packet_count", st.getPacketCount());
jsonObject.put("flow_count", st.getFlowCount());
jsonArray.add(jsonObject);
}