String jsonMapStr = "{"system":"1,\"2\",3","createDate":"2017-02-21"}"; JSONObject jsonMap = JSONObject.fromObject(jsonMapStr); Iterator<String> it = jsomMap.keys(); while(it.hasNext()){ String key = (String) it.next(); String value = (String) jsonMap.get(key); System.out.println(key+":"+value); }