如何使用java搜索/查找JSON [英] How to search/find In JSON with java

问题描述

我有一个下面的JSON字符串，我想在JSON字符串中找到/搜索条件。

I have a below JSON string from the below i want to find/search criteria in JSON String.

1）。查找存在的键数。
2）。获取给定键的值（如果我们有数组）

1). To find the Number of keys present. 2). To get the values of given key(if we have array)

{
"store": {
    "book": [
        {
            "category": "reference",
            "author": "Nigel Rees",
            "title": "Sayings of the Century",
            "price": 8.95
        },
        {
            "category": "fiction",
            "author": "Evelyn Waugh",
            "title": "Sword of Honour",
            "price": 12.99
        },
        {
            "category": "fiction",
            "author": "Herman Melville",
            "title": "Moby Dick",
            "isbn": "0-553-21311-3",
            "price": 8.99
        },
        {
            "category": "fiction",
            "author": "J. R. R. Tolkien",
            "title": "The Lord of the Rings",
            "isbn": "0-395-19395-8",
            "price": 22.99
        }
    ],
    "bicycle": {
        "color": "red",
        "price": 19.95
    }
},
 "expensive": 10
}

我正在寻找像Groovy GPath语法的解决方案

I am looking a solution like Groovy GPath Syntax

• store.book - 此数组的大小。


• store.book [*]。category - 数组中密钥的出现次数。


• store.bicycle - 如果发现它必须返回真值

推荐答案

您还可以使用 JsonPath 项目由 REST Assured 。此JsonPath项目使用Groovy GPath表达式。在Maven你可以这样依赖它：

You can also use the JsonPath project provided by REST Assured. This JsonPath project uses Groovy GPath expressions. In Maven you can depend on it like this:

<dependency>
    <groupId>com.jayway.restassured</groupId>
    <artifactId>json-path</artifactId>
    <version>2.4.0</version>
</dependency>

示例：

获取所有图书类别的列表：

To get a list of all book categories:

List<String> categories = JsonPath.from(json).get("store.book.category");

获取第一个图书类别：

String category = JsonPath.from(json).get("store.book[0].category");

获取最后一本书类别：

String category = JsonPath.from(json).get("store.book[-1].category");

获取价格在5到15之间的所有书籍：

Get all books with price between 5 and 15:

List<Map> books = JsonPath.from(json).get("store.book.findAll { book -> book.price >= 5 && book.price <= 15 }");

GPath非常强大，您可以在路径中使用更高阶函数和所有Groovy数据结构表达式。

GPath is very powerful and you can make use of higher order functions and all Groovy data structures in your path expressions.

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