String param = "{\"sid\":14,\"path\":\"[{id : 'null',text : 'upload\\cggl\\wlcg\\wldg\\20160926164939.jpg'}]\",\"oldnr\":\"\",\"action\":\"\",\"nrpath\":\"20160106105229.jpg\"}";
JSONObject jo = new JSONObject().fromObject(param);
JSONArray ja = new JSONArray().fromObject(jo.get("path"));
JSONObject jo1 = new JSONObject().fromObject(ja.get(0));
System.out.println(jo1.get("text"));