JAVA json方式访问，得到值，然后json的解析

    public static void main(String[] args) {
        //客户端json方式访问服务端
        JSONObject json = new JSONObject();
        json.put("vin", "FX003054");
        String result = AdvancedUtil.httpTextRequest("http://localhost:8080/ECMS/maintainRecord/inspection", null, "POST", json.toString(), null);
        System.out.println(result);
        
        //取得json返回值
        String a = "{"carlist":[{"carno":"FX003905"},{"carno":"FF"}],"retval":1,"total":1}";
        JSONObject resultJson = JSONObject.fromObject(a);
        
        System.out.println(resultJson.getString("retval"));//取JSON中跟数组同级值
        
        JSONArray jsonArray = resultJson.getJSONArray("carlist");//取JSON数组中值
        if(jsonArray != null && jsonArray.size() > 0){
            for(int i = 0;i<jsonArray.size();i++){
                JSONObject JSONCar = jsonArray.getJSONObject(i);
                System.out.println(JSONCar.get("carno"));
            }
        }
    }
}