JSONObject jsonObject = new JSONObject(jsonString);

        Iterator iterator = jsonObject.keys();

while(iterator.hasNext()){

            key = (String) iterator.next();

        value = jsonObject.getString(key);

}

private static Map<String, List<NewNet>> toMap(Object object) {

        Map<String, List<NewNet>> data = new HashMap<String, List<NewNet>>();

        JSONObject jsonObject = JSONObject.fromObject(object);

        Iterator ite = jsonObject.keys();

        while (ite.hasNext()) {

            String key = String.valueOf(ite.next());

            JSONArray obj = JSONArray.fromObject(jsonObject.get(String.valueOf(key)));

            Iterator<Object> it = obj.iterator();

            while (it.hasNext()) {

                    JSONObject Obj= JSONObject.fromObject(it.next());

                    NewNet value = (NewNet) Obj.toBean(Obj,NewNet.class);

                    if(data.keySet().contains(key)){

                        data.get(key).add(value);

                    }else{

                        List<NewNet> List=new ArrayList<NewNet>();

                        List.add(value);

                        data.put(key, List);

                    }

            }

        }

        return data;

    }

public static List<RPingCheckParamsDto> jsonToVar(String jsons){

            JSONArray objs = JSONArray.fromObject(jsons);

            Iterator<JSONObject> it = objs.iterator();

            List<RPingCheckParamsDto> dtos = new ArrayList<RPingCheckParamsDto>();

            while (it.hasNext()) {

                JSONObject ob = (JSONObject) it.next();

                RPingCheckParamsDto dto = new RPingCheckParamsDto();

                if(ob.getString("device")!=null){

                   dto.setDevice((Device)JSONObject.toBean(JSONObject.fromObject(ob.

                           get("device")),Device.class));

                }

                if(ob.getString("starttime")!=null){

                    dto.setStarttime((Long)ob.get("starttime"));

                }

                if(ob.getString("type")!=null){

                    dto.setType((Integer)ob.get("type"));

                }

                if(ob.getString("segs")!=null){

                   dto.setSegs((ArrayList<IPTreeNodeBean>)JSONArray.toList(JSONArray.

                           fromObject(ob.get("segs")),IPTreeNodeBean.class));

                }

               if(ob.getString("assignedIps")!=null){

                 ArrayList<String>  Ps = (ArrayList<String>)JSONArray.toCollection(JSONArray.

                         fromObject(ob.get("assignedIps")));

                 Set<String> bs = new HashSet<String>();

                 for(String p:Ps){

                     bs.add(p);

                       }

                if(ob.getString("nsegs")!=null){

                   dto.setNsegs((ArrayList<NewNet>)JSONArray.toList(JSONArray.

                       fromObject(ob.get("nsegs")),NewNet.class));

                }

              dto.setAssignedIps(bs);

               }

                if(dto!=null){

                    dtos.add(dto);

                }

            }

            return dtos;

        }