JSONPath小試牛刀之Snack3

最近在網上看了些JSONPath的入門例子。打算用Snack3這個框架寫寫例子。json path對`JSON的處理絕對是神器。

1.準備JSON字符串

{
    "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,
            "isbn": "0-553-21311-3"
        }],
        "bicycle": {
            "color": "red",
            "price": 19.95
        }
    }
}

2.Meven 依賴

<dependency>
  <groupId>org.noear</groupId>
  <artifactId>snack3</artifactId>
  <version>3.1.5.3</version>
</dependency>

3.示例代碼

@Test
public void demo1() {
    String json = "{\"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,\"isbn\":\"0-553-21311-3\"}],\"bicycle\":{\"color\":\"red\",\"price\":19.95}}}";

    ONode n = ONode.load(json);

    Map map = n.select("$.store.book[0]").toObject(Map.class);

    System.out.println("category: " + map.get("category"));
    System.out.println("author: " + map.get("author"));
    System.out.println("title: " + map.get("title"));
    System.out.println("price: " + map.get("price"));

    System.out.println("========================");
   
    List<String> list = n.select("$.store.book[*].author").toObject(List.class);
    for (String author : list) {
        System.out.println(author);
    }

    //java bean 泛型輸出，此處不打印了
    List<BookModel> list2 = n.select("$.store.book")
                             .toObject((new ArrayList<BookModel>(){}).getClass());
}

4.控制檯打印結果

category: reference
author: Nigel Rees
title: Sayings of the Century
price: 8.95
========================
Nigel Rees
Evelyn Waugh