致电Java获取书籍详细信息

有一种HTTP GET方法可从中检索信息book db。此处的查询响应是分页的，并进一步按字符串＆page = num进行查找，num是页码。

给定一串所有者，getOwnerDetails必须执行以下操作：

Query : https://x.com/api/book?owner=<ownerNmae> 初始化details数组以存储字符串元素列表。

使用以下命令将在数据字段中返回的每本书的名称存储到详细信息目录：

1. 如果title和story_title都为空，则忽略该书。

要么，

1. 如果title不为null，请使用title作为名称。
2. 如果title为null，则story_title用作名称。

根据total_pages计数，通过分页获取所有数据，然后执行上述步骤。下面的功能将对完成的任务起作用Return array of titles。

public static List<String> getOwnerDetails(String book){
}

我曾尝试这样做，但无法完全获得数据调用。JSON数据：

{
    "page": 1,
    "per_page": 10,
    "total": 3,
    "total_pages": 1,
    "data": [{
        "title": "A Message to Our Customers",
        "url": "http://www.apple.com/customer-letter/",
        "author": "epaga",
        "num_comments": 967,
        "story_id": null,
        "story_title": null,
        "story_url": null,
        "parent_id": null,
        "created_at": 1455698317
    }, {
        "title": "“Was isolated from 1999 to 2006 with a 486. Built my own late 80s OS”",
        "url": "http://imgur.com/gallery/hRf2trV",
        "author": "epaga",
        "num_comments": 265,
        "story_id": null,
        "story_title": null,
        "story_url": null,
        "parent_id": null,
        "created_at": 1418517626
    }, {
        "title": "Apple’s declining software quality",
        "url": "http://sudophilosophical.com/2016/02/04/apples-declining-software-quality/",
        "author": "epaga",
        "num_comments": 705,
        "story_id": null,
        "story_title": null,
        "story_url": null,
        "parent_id": null,
        "created_at": 1454596037
    }]
}

我的代码::

import org.json.simple.JSONArray;
import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;

    import java.io.IOException;
    import java.net.HttpURLConnection;
    import java.net.URL;
    import java.util.Scanner;

    public class Pr4 {
        public static void main(String[] args) throws IOException {
            String response = "";

            try {
                URL url = new URL("https://x.com/api/book?owner=epaga");
                HttpURLConnection conn = (HttpURLConnection) url.openConnection();
                conn.setRequestMethod("GET");
                conn.connect();
                int responsecode = conn.getResponseCode();
                System.out.println("Response code is: " + responsecode);

                if (responsecode != 200)
                    throw new RuntimeException("HttpResponseCode: " + responsecode);
                else {
                    Scanner sc = new Scanner(url.openStream());
                    while (sc.hasNext()) {
                        response += sc.nextLine();
                    }
                    System.out.println("\nJSON Response in String format");
                    System.out.println(response);
                    sc.close();
                }

                JSONParser parse = new JSONParser();

                JSONObject jobj = (JSONObject) parse.parse(response);
                System.out.println("page ::  " + jobj.get("page"));
                System.out.println("per_page :: " + jobj.get("per_page"));
                System.out.println("total :: " + jobj.get("total"));
                System.out.println("total_pages ::  " + jobj.get("total_pages"));
                JSONArray jsonarr_1 = (JSONArray) jobj.get("data");
                for (int i = 0; i < jsonarr_1.size(); i++) {
                    JSONObject jsonobj_1 = (JSONObject) jsonarr_1.get(i);
                    System.out.println("Elements under data array");
                    System.out.println("\nTitle: " + jsonobj_1.get("title"));
                    System.out.println("URL: " + jsonobj_1.get("url"));
                    System.out.println("author: " + jsonobj_1.get("author"));
                    System.out.println("Story_Title: " + jsonobj_1.get("story_title"));
                }
                conn.disconnect();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

之后，我需要调用以下函数以返回标题数组。

public static List<String> getOwnerDetails(String book){
}

JSON响应：页面，每页，总计，总计页面，数据（包含书籍信息的JSON对象数组）

如何用Java中上述方法的调用实现该调用？