在java中查询一个JSONObject [英] Query a JSONObject in java

问题描述

我想知道是否在某个地方存在能够查询 JSONObject 的 Java 库.更深入地，我正在寻找类似的东西:

I was wondering if somewhere out there exists a java library able to query a JSONObject. In more depth I'm looking for something like:

String json = "{ data: { data2 : { value : 'hello'}}}";

...
// Somehow we managed to convert json to jsonObject
...

String result = jsonObject.getAsString("data.data2.value");

System.out.println(result);

我希望得到hello"作为输出.

I expect to get "hello" as output.

到目前为止，我找到的最快的方法是使用 Gson:

So far, the fastest way I have found is using Gson:

jsonObject.getAsJsonObject("data").getAsJsonObject().get("data2").getAsJsonObject("value").getAsString();

编写和阅读实际上并不容易.有什么更快的吗?

It's not actually easy to write and read. Is there something faster?

推荐答案

我刚刚意外地发现了一个非常有趣的项目:JSON 路径

I've just unexpectedly found very interesting project: JSON Path

JsonPath 之于 JSON 就像 XPATH 之于 XML，这是一种提取给定文档部分的简单方法.

JsonPath is to JSON what XPATH is to XML, a simple way to extract parts of a given document.

有了这个库，您可以更轻松地完成您的要求，然后是我之前的建议:

With this library you can do what you are requesting even easier, then my previous suggestion:

String hello = JsonPath.read(json, "$.data.data2.value");

System.out.println(hello); //prints hello

希望这也能有所帮助.

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