Java获取嵌套的json串里的返回结果

Json串代码：

{     "requestId": "SMELP_DATA_CUSTOMS_8062a1b4-a954-4fd1-8ded-40fdf7594296",     "responseData": {         "loadType": "2--2",         "records": [             {                 "erMsg": "'银行卡号'卡BIN校验未通过",                 "seqNo": "0",                 "cardType": "",                 "authResult": "",                 "erCode": "E000001",                 "bankName": ""             }         ],         "detailError": null,         "responseMessage": "接口调用成功！",         "requestNo": "123",         "transNo": null,         "dataSource": null,         "responseCode": "000000"     },     "responseMessage": "请求成功",     "responseCode": "000000" }

例如获取erMsg里的信息：

          //result是调用接口之后返回的String类型的json串

           JSONObject obj = JSONObject.parseObject(result);

           JSONObject responseData = (JSONObject) obj.get("responseData");            JSONArray records = (JSONArray) responseData.get("records");            JSONObject erMsg1 =  (JSONObject) records.get(0);                        String erMsg = erMsg1.getString("erMsg");

例如获取responseMessage里的信息：

            JSONObject obj = JSONObject.parseObject(result);             String msg = obj.getString("responseMessage");