如何实现Map转JSON

public JSON toCamelCaseFromMap(Object item) {
        Map camelMapConfig = new HashMap<>();
        for (String str : ((Map) item).keySet()) {
            camelMapConfig.put(toCamelCase(str), ((Map) item).get(str));
        }
        String jsonStr = JSON.toJSONString(camelMapConfig);
        JSONObject jsonObject = JSON.parseObject(jsonStr);
 ){
            return jsonObject;
    }

Question q = com.alibaba.fastjson.JSONObject.toJavaObject(toCamelCaseFromMap(map.get("_source")), Question.class);