Question

我有Java应用程序，它获取像这样的JSON字符串

{
    "name": "testName",
    "message": [
        "TestMessage."
    ]
}

我需要检查是否存在值为“TestMessage”的“message”数组节点。在任何一个元素中。

我可以在我的代码中访问com.jway.jsonpath.JsonPath。但它看起来只能读取特定节点的值。例如。像这样我将能够获取“消息”数组的第一个元素

JsonPath.read(content, "$.message[0]")

但是通过这种方式，我必须将数组的所有元素都提取到Java中并在那里验证它们。相反，我想通过JsonPath引擎本身执行此检查。

如何使用JsonPath实现此目标？使用其他库是否更好？

Answer 1

You can use the filter operations.

Filters are logical expressions used to filter arrays. A typical filter would be [?(@.age > 18)] where @ represents the current item being processed. More complex filters can be created with logical operators && and ||. String literals must be enclosed by single or double quotes ([?(@.color == 'blue')] or [?(@.color == "blue")]).

like this:

 JsonPath.read(json, "$.message[?(@ == "TestMessage.")]");

more can refer the readme.MD of https://github.com/json-path/JsonPath

检查JSON是否包含值的节点

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