[나립] json string to json object

response는 String.class인상태
        JSONObject rootObject = (JSONObject) new JSONParser().parse(response);
        JSONObject kakaoAccountObject = (JSONObject) rootObject.get("kakao_account");
        
        
        JSONObject rootObject = (JSONObject) new JSONParser().parse(req.toJSONString());
        System.out.println(rootObject.get("id"));

    public String getProductNameById(@RequestBody JSONObject req) throws Exception {

        System.out.println(req); // {"id":1}
        System.out.println(req.get("id")); // 1
        System.out.println(req.toJSONString()); // {"id":1}

        JSONObject rootObject = (JSONObject) new JSONParser().parse(req.toJSONString());
        System.out.println(rootObject.get("id"));


        return "success";
    }