listJson(JSON.parseObject("jsonstr"));
public void listJson(Object objJson) {
    if (objJson instanceof JSONArray) {
        JSONArray jsonArray = (JSONArray) objJson;
        if (jsonArray.size() > 0) {
            for (int i = 0; i < jsonArray.size(); i++) {
                listJson(jsonArray.getJSONArray(i));
            }
        }
    } else if (objJson instanceof JSONObject) {
        JSONObject jsonObject = (JSONObject) objJson;
        Set<String> keySet = jsonObject.keySet();
        Iterator<String> iterator = keySet.iterator();
        while (iterator.hasNext()) {
            String key = iterator.next();
            Object value = jsonObject.get(key);
            if (value instanceof JSONArray) {
                JSONArray innerArr = (JSONArray) value;
                listJson(innerArr);
            } else if (value instanceof JSONObject) {
                listJson(value);
            } else {
                System.out.println(key + "<<===>>" + value.toString());
            }
        }
    }
}