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List<Goods> goodsList = new ArrayList<>();
goodsList.add(good);
生成JSONArray
JSONArray array = JSONArray.fromObject(goodsList);
params.put("goodsList", array.toString());
解析
List<Goods> goodsList = new ArrayList<>();
JSONArray jsonArray = JSONArray.fromObject(params.get("goodsList"));
goodsList = JSONArray.toList(jsonArray,Goods.class);//这里的t是Class<T>