Java 从多个项目的Rest Assured Json响应中获取随机场

从Ruby迁移到Java，我需要从一个多项目响应中随机解析并获取一个字段

这是我用来获得回复的ApiCall方法：

        Response response = given().
            headers(this.headers).
            params(this.body).
        when().
            post(this.url).
        then().
            contentType(ContentType.JSON).
            statusCode(200).
        extract().
            response();

它给了我这个JSON结构：

{
  "Contents": {
    "Title": "Search results",
    "Count": "10",
    "Page": "1",
    "TotalCount": "1",
    "TotalPages": 2,
    "Genres": [
      "Genre_1",
      "Genre_2",
      "Genre_3"
    ],
    "Contents": [
      {
        "title": "content1_title",
        "original_text": "original text 1",
        "full_text": "Sample full sized text 1",
        "short_text": "Sample short text 1",
        "children_ids": {
          "item": [
            1,
            2
          ]
        },
        "children_uuids": {
          "item": [
            "item1_uuid",
            "item2_uuid"
          ]
        },
        "parent_ids": {
          "item": [
            1
          ]
        },
        "parent_uuids": {
          "item": [
            "item1_uuid"
          ]
        },
        "aired_from": "1994-01-01",
        "aired_to": "1994-12-31",
        "tags": {
          "item": [
            ""
          ]
        },
        "available_condition1": 0,
        "available_condition2": 1,
        "price_condition1": "0.00",
        "price_condition2": "13.00"
      },
      {
        "title": "content2_title",
        "original_text": "original text 2",
        "full_text": "Sample full sized text 2",
        "short_text": "Sample short text 2",
        "children_ids": {
          "item": [
            1,
            2
          ]
        },
        "children_uuids": {
          "item": [
            "item1_uuid",
            "item2_uuid"
          ]
        },
        "parent_ids": {
          "item": [
            1
          ]
        },
        "parent_uuids": {
          "item": [
            "item1_uuid"
          ]
        },
        "aired_from": "1998-01-01",
        "aired_to": "1998-01-31",
        "tags": {
          "item": [
            ""
          ]
        },
        "available_condition1": 0,
        "available_condition2": 1,
        "price_condition1": "0.00",
        "price_condition2": "13.00"
      }
    ]
  },
  "Success": true
}

问题是我需要得到一个随机的“title”字段，其中至少有一个“children_uuid”来自于响应中的“children_uuid”

据我所知，这些步骤是：

1） 获取“Contents.Contents”项的总大小。 2） 获取一个介于0和项目总数之间的随机数。 3） 使用该数字选择一个“Contents.Contents.[n].title”格式或类似格式的项目

尝试了以下操作但未成功：

        JsonPath jsonPath = new JsonPath(response.toString());
        List<?> list = jsonPath.getList("Contents.Contents.title.flatten()");
        System.out.println(list);

作为参考，Ruby中的代码如下：

            amount = @result['api_response']['Contents']['Contents'].count
            amount = amount - 1
            a = rand(0..amount)
            while @result['api_response']['Contents']['Contents'][a]['children_uuids']['item'].nil? do
                a = rand(0..amount)
                #children_uuids = $result['api_response']['Contents']['Contents'][a]['children_uuids']
            end
            #price_hd = @result['api_response']['Contents']['Contents'][a]['price_hd']
            content_title = @result['api_response']['Contents']['Contents'][a]['title']

更新：我已经让它部分工作。。。我找到了一种从列表中选择一项的方法，该行为：

String contentTitle = response.then().extract().path("Contents.Contents[0].title");

但是找不到使用此jsonpath的方法

String contentTitle = response.then().extract().path("Contents.Contents.[?(@.children_uuids)].uuid");

第二行告诉我：

java.lang.IllegalArgumentException:
Invalid JSON expression:
Script1.groovy: 1: unexpected token: [ @ line 1, column 45.
   nRootObject.Contents.Contents.[?(@.child
                                 ^

---

提前感谢。

在我看来，这很难在REST-assured中实现，甚至在Java中也很难做到

我建议你看一下（免责声明：am-dev）。因此，您可以调用JavaScript函数来生成一个随机数，将其分配给一个变量，然后形成一个路径表达式来完成您想要的操作：

Feature:

Scenario:

* def data = read('data.json')
* def size = (data.Contents.Contents.length)
* def index = Math.floor(Math.random() * size)
* print 'selected index: ' + index
* def item = (data.Contents.Contents[index])
* def children_uuids = item.children_uuids
* match children_uuids == { item: ['item1_uuid', 'item2_uuid'] }

---

更新：我找到了具有以下代码的解决方案：

            // get random content data
            Integer contentAmmount = response.body().path("Contents.Contents.size()");
            Random randomGenerator = new Random();
            int randomInt = randomGenerator.nextInt(contentAmmount);
            while (response.body().path(
                    String.join("", "Contents.Contents[", Integer.toString(randomInt), 
                            "].children_uuids.item")).toString().isEmpty() ) {
                randomInt = randomGenerator.nextInt(contentAmmount);
            }

            String contentTitle = response.then().extract()
                    .path(String.join("", "Contents.Contents[", Integer.toString(randomInt), "].title"));
            String contentUuid = response.then().extract()
                    .path(String.join("", "Contents.Contents[", Integer.toString(randomInt), "].uuid"));
            String contentChildrenUuid = response.body().path(
                    String.join("", "Contents.Contents[", Integer.toString(randomInt), 
                            "].children_uuids.item"));

            // get random content data
            Integer contentAmmount = response.body().path("Contents.Contents.size()");
            Random randomGenerator = new Random();
            int randomInt = randomGenerator.nextInt(contentAmmount);
            while (response.body().path(
                    String.join("", "Contents.Contents[", Integer.toString(randomInt), 
                            "].children_uuids.item")).toString().isEmpty() ) {
                randomInt = randomGenerator.nextInt(contentAmmount);
            }

            String contentTitle = response.then().extract()
                    .path(String.join("", "Contents.Contents[", Integer.toString(randomInt), "].title"));
            String contentUuid = response.then().extract()
                    .path(String.join("", "Contents.Contents[", Integer.toString(randomInt), "].uuid"));
            String contentChildrenUuid = response.body().path(
                    String.join("", "Contents.Contents[", Integer.toString(randomInt), 
                            "].children_uuids.item"));