遍历JSONObject的key值及获取key对应的value

//遍历参数：

JSONObject obj = JSONObject.fromObject(parameters);
JSONObject param = obj.getJSONObject("param");
Map<String, Object> conditionMap = new HashMap<String, Object>();
Iterator iterator = param.keys();
while (iterator.hasNext()){
    String key = (String) iterator.next();
    String val = param.getString(key);
    System.out.println("[key="+key+" val="+val+"]");
    conditionMap.put(key, val);
}