如何用java在JSON中进行搜索/查找

Question

null

    {
    "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
    }

我正在寻找一个解决方案，如Groovy GPath语法

• store.book-此数组的大小。
• store.book[*].category-如何计算数组中的键值。
• store.bicycle-如果发现它必须返回true值

Answer 1

您还可以使用REST Assured提供的JsonPath项目。这个JsonPath项目使用Groovy GPath表达式。在Maven中，您可以像这样依赖它：

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

例子：

获取所有图书类别的列表：

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

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

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

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