如何在Java中提取最后一个jsonPath值？

Question

您好我想问一下如何检索jsonPath中的最后一个值

{
    "testing": [
        {
            "transactionId": "5a99dcf84b7f633a5489805d",
            "trackingId": "555112",
            "tn": "6095555112",
            "customerName": "John",
            "customerLastName": "Chan"
        },
        {
            "transactionId": "5a99dd3f4b7f633a54898068",
            "tn": "6095555112",
            "trackingId": "555112",
            "customerName": "Amanda",
            "customerLastName": "Brown"

        }
    ]
}

我的Java代码示例行

System.out.println("response.prettyPrint() = " + response.jsonPath().getString("testing.transactionId"));

产量

response.prettyPrint() = 5a99dcf84b7f633a5489805d,5a99dcf84b7f633a5489805d

现在它正在打印所有transactionIds。它应该只是拉最新的一个意味着底部的一个，其中transactionId =“5a99dd3f4b7f633a54898068”

如果有新值进入（通过后端逻辑，则会在其中添加另一组值）。如何编写一条能够提取最新值集的行？

例

{
    "testing": [
        {
            "transactionId": "5a99dcf84b7f633a5489805d",
            "trackingId": "555112",
            "tn": "6095555112",
            "customerName": "John",
            "customerLastName": "Chan"
        },
        {
            "transactionId": "5a99dd3f4b7f633a54898068",
            "tn": "6095555112",
            "trackingId": "555112",
            "customerName": "Amanda",
            "customerLastName": "Brown"

        },
        {
            "transactionId": "newID",
            "tn": "6095555112",
            "trackingId": "555112",
            "customerName": "Amanda",
            "customerLastName": "Brown"

        },
    ]
}

现在已经存储了一个新数据集，我将如何编写一个可以提取transactionId“NewID”的java代码？

我不想硬编码和写“.transactionId [0]”[1]或[2]之类的东西

Answer 1

好吧，而不是使用getString你可以使用getList例如

List<String> strList = response.jsonPath().getList("testing.transactionId");

System.out.println("last value is " + strList.get(strList.size()-1))

Answer 2

我希望这有帮助。我不知道确切的代码，但我知道在数组中你可以得到最后一项...

 ARRAY.get(ARRAY.size()-1) 

我不确定如何在你的JSON数组中正确实现它，但我希望这会向你发送正确的方向。

Answer 3

使用Gson api

它转换json - >> java对象

http://tutorials.jenkov.com/java-json/gson.html#parsing-json-into-java-objects