Java遍历JSON

用Iterator迭代器遍历取值 :

    public static void main(String[] args) {
        String s = "{'A':{'a':'1' ,'aa':'11'},'B':{'b':'2' ,'bb':'22'}}" ;
        JSONObject jsonObject1=JSONObject.fromObject(s);
        Iterator<String> iterator1 =jsonObject1.keys();
        while(iterator1.hasNext()){
            String key1 = iterator1.next();
            String value1 = jsonObject1.getString(key1);
            System.out.println(key1);
            JSONObject jsonObject2=JSONObject.fromObject(value1);
            Iterator<String> iterator2 =jsonObject2.keys();
            while(iterator2.hasNext()){
                String key2 = iterator2.next();
                String value2 = jsonObject2.getString(key2);
                System.out.println(" - "+key2);
                System.out.println(" -- "+value2);
            }
        }
    }