从json中取出任意位置的对应的key的value值

具体方法请参考 JsonPath

{
    "headerInfos":{
        "code":"0000",
        "reason":"操作成功"
    },
    "responseData":{
        "resultCode":"0000",
        "resultDesc":"操作成功",
        "attach":"",
        "data":{
            "itemsExcess":{
                "ratableResourceInfos":null
            },
            "itemsInside":{
                "productOFFs":[
                    {
                        "productId":"19",
                        "productName":"其他",
                        "itemInformations":[
                            {
                                "productOFFName":"我要取得内容",
                                "prodOfferInstanceId":"5000003201100193",
                                "productOfferId":"30019141",
                                "ratableResourceInfos":[
                                    {
                                        "ownerType":"1",
                                        "ratableResourceName":"语音",
                                        "volumeInfos":[
                                            {
                                                "ownerID":"3435346456453",
                                                "ratableResourceID":"3",
                                                "ratableResourceName":"时长",
                                                "beginTime":"20190218000000",
                                                "endTime":"20190301000000",
                                                "ratableAmount":"39",
                                                "balanceAmount":"19",
                                                "usageAmount":"20",
                                                "unitTypeId":"1",
                                                "transferAmount":"0",
                                                "isInfiniteAmount":"0"
                                            }
                                        ]
                                    }
                                ],
                                "shareUsageAmountDetails":null
                            }
                        ]
                    }
                ]
            }
        }
    }
}

我要取productOFFName 对应的value值，上面json可以看到，字典包含数组，数组里面保存字典，是个比较复杂的json。取出的语句为

String str = JsonPath.read(要读取的json,
                    "@.responseData.data.itemsInside.productOFFs[0].itemInformations[0].productOFFName")