json中的list转换成普通的list

String listStr = StringDUtil.changeNullToEmpty(requestParamsHM.get("list"));

listStr = "{list:" + listStr + "}";

JSONObject jobj = JSONObject.fromObject(listStr);

HashMap<String, Class> classMap = new HashMap<String, Class>();
classMap.put("list", HashMap.class);
JSONListModel jsonListModel = (JSONListModel) JSONObject.toBean(jobj, JSONListModel.class, classMap);

List availablelist = jsonListModel.getList();
System.out.println(availablelist.size());

requestMap.put("list", availablelist);
String biaoji = null;
this.arrConfirmationManager.updateCusInfoForElec(requestMap, biaoji);