java 多层json转map

public static Map<String, Object> parseJSON2Map(String jsonStr){    
            Map<String, Object> map = new HashMap<String, Object>();    
            JSONObject json = JSONObject.fromObject(jsonStr);    
            for(Object k : json.keySet()){    
                Object v = json.get(k);     
                if(v instanceof JSONArray){    
                    List<Map<String, Object>> list = new ArrayList<Map<String,Object>>();    
                    Iterator it = ((JSONArray)v).iterator();    
                    while(it.hasNext()){    
                        Object json2 = it.next();    
                        list.add(parseJSON2Map(json2.toString()));    
                    }    
                    map.put(k.toString(), list);    
                } else {    
                    map.put(k.toString(), v);    
                }    
            }    
            return map;    
        }