请求接口转list<对象>
JSONObject obj = PostInterface.post(PostInterface.ServletName.activitiModel,"queryPlaceHolderList",new HashMap()).getJSONObject("SvcCont");
List<Placeholder> dataArr = JSON.parseArray(obj.getString("placeHolderList"),Placeholder.class);
原文：https://www.cnblogs.com/320321ABab/p/10697124.html