获取超过 25 个帖子时出现异常 restFb

Question

我正在使用 restFb 版本 1.34.1，我想提取页面的所有帖子。由于一次只能获得25个帖子，所以我使用

hasNext

和

getNextPageUrl

获取更多帖子的方法。这是我的代码片段。

Connection<Post> pageFeed = facebookClient.fetchConnection(page.getId() + "/feed", Post.class);
        //pageFeed.hasNext()
        List<Post> data = pageFeed.getData();
        int count=0;
        for (Post post : data) {
            count++;
            System.out.println("count------------------------>"+count);
            System.out.println("story-->"+post.getStory());
            System.out.println("message--->"+post.getMessage());
            System.out.println("postid---------->"+post.getId());

        }
        while(pageFeed.hasNext())
        {
            System.out.println(pageFeed.getNextPageUrl());
            pageFeed = facebookClient.fetchConnection(pageFeed.getNextPageUrl(),Post.class);
            System.out.println(pageFeed);
             data = pageFeed.getData();
            for (Post post : data) {
                count++;
                System.out.println("count------------------------>"+count);
                System.out.println("story-->"+post.getStory());
                System.out.println("message--->"+post.getMessage());
                System.out.println("postid---------->"+post.getId());
                System.out.println("----------------------------");
            }
        }

我成功获得了前 25 个帖子，但是

行出现异常

pageFeed = facebookClient.fetchConnection(pageFeed.getNextPageUrl(),Post.class);

以下是例外情况

Exception in thread "main" com.restfb.json.JsonException: JsonObject["data"] not found.
    at com.restfb.json.JsonObject.get(JsonObject.java:482)
    at com.restfb.json.JsonObject.getJsonArray(JsonObject.java:550)
    at com.restfb.Connection.<init>(Connection.java:154)
    at com.restfb.DefaultFacebookClient.fetchConnection(DefaultFacebookClient.java:363)
    at com.orkash.restFb.PostExtractor.crawlPage(PostExtractor.java:76)
    at com.orkash.restFb.PostExtractor.main(PostExtractor.java:30)

我确实检查了文档和其他堆栈线程，发现此方法仅适用于获取超过 25 个帖子。谁能指出这里的错误。

我也对通过浏览器获取的nextPageUrl进行了get请求，得到了json，里面有key"data"。这是通过上述过程获得的样本 json :- （完整的 json 很长所以我粘贴了其中的片段）

{
  "data": [
    {
      "id": "177526890164_10158068948860165",
      "from": {
        "name": "Narendra Modi",
        "category": "Politician",
        "id": "177526890164"
      },
      "message": "Paid tributes to Shri Sunder Lal Patwa in Bhopal.",
      "story": "Narendra Modi added 2 new photos.",
      "story_tags": {
        "0": [
          {
            "id": "177526890164",
            "name": "Narendra Modi",
            "type": "page",
            "offset": 0,
            "length": 13
          }
        ]
      },
      "picture": "https://scontent.xx.fbcdn.net/v/t1.0-0/s130x130/15673047_10158068946670165_3063831989784759068_n.jpg?oh=248d746b114f486e12be04058dfd0791&oe=591975EE",
      "link": "https://www.facebook.com/narendramodi/photos/a.10150164299700165.421791.177526890164/10158068946670165/?type=3",
      "name": "Photos from Narendra Modi's post",
      "icon": "https://www.facebook.com/images/icons/photo.gif",
      "actions": [
        {
          "name": "Comment",
          "link": "https://www.facebook.com/177526890164/posts/10158068948860165"
        },
        {
          "name": "Like",
          "link": "https://www.facebook.com/177526890164/posts/10158068948860165"
        }
      ],
      "privacy": {
        "value": "",
        "description": "",
        "friends": "",
        "allow": "",
        "deny": ""
      },
      "type": "photo",
      "status_type": "added_photos",
      "object_id": "10158068946670165",
      "created_time": "2016-12-28T11:59:25+0000",
      "updated_time": "2017-01-04T15:59:35+0000",
      "shares": {
        "count": 2708
      },
      "is_hidden": false,
      "is_expired": false,
      "likes": {
        "data": [
          {
            "id": "131388654027704",
            "name": "Lovely Setia"
          },
          {
            "id": "111162672721989",
            "name": "Dilip Bhil"
          },
          {
            "id": "1554142888157290",
            "name": "Raees Khan Plastick"
          },
          {
            "id": "105352369807500",
            "name": "Dhawan Sharma"
          },
          {
            "id": "205545709915488",
            "name": "Kehraram Parajapti"
          },
          {
            "id": "1815854775323914",
            "name": "Àvàý Śhàŕmà"
          },
          {
            "id": "1809366642682126",
            "name": "Posanjit Chakraborty"
          },
          {
            "id": "814626555322719",
            "name": "Pappu Ray"
          },
          {
            "id": "143505946020792",
            "name": "Mand Jaz"
          },
          {
            "id": "1671421303114441",
            "name": "Pranab Jyoti Gogoi"
          },
          {
            "id": "1705764099657485",
            "name": "Riya Singh"
          },
          {
            "id": "243742032692553",
            "name": "Nevji Bhli"
          },
          {
            "id": "716696131727496",
            "name": "Purushotham Naidu"
          },
          {
            "id": "193933561077517",
            "name": "Durgesh Sahu Sahu"
          },
          {
            "id": "231379427317074",
            "name": "Pankaj Kumar"
          },
          {
            "id": "132570197106057",
            "name": "Srinivas Battar"
          },
          {
            "id": "144547786036296",
            "name": "Jgtpj Uday Prakash"
          },
          {
            "id": "206532629811957",
            "name": "Rajabhau Raut"
          },
          {
            "id": "469875846448916",
            "name": "Drkishor Sinha"
          },
          {
            "id": "140811979746333",
            "name": "Satyam Lodhi"
          },
          {
            "id": "109671812871571",
            "name": "Daleep Gour Daleep"
          },
          {
            "id": "1577239832532749",
            "name": "Tejas Nemanwar"
          },
          {
            "id": "658207560971950",
            "name": "Uttamsingh Rajpurohit"
          },
          {
            "id": "147763812380490",
            "name": "Lovelygiri Giri"
          },
          {
            "id": "748935241836869",
            "name": "Abhijeet Joshi"
          }
        ],

Answer 1

你用错了Connection。它应该是这样的：

int count=0;
Connection<Post> pageFeed = facebookClient.fetchConnection(page.getId() + "/feed", Post.class);
for (List<Post> pageFeedConnectionPage : pageFeed)
    for (Post post : pageFeedConnectionPage) {
        count++;
        System.out.println("count------------------------>" + count);
        System.out.println("story-->" + post.getStory());
        System.out.println("message--->" + post.getMessage());
        System.out.println("postid---------->" + post.getId());
        System.out.println("----------------------------");
    }

迭代连接 returns "pages" 并自动将下一个调用发送到图形 API。在每一页上，都有一个帖子列表，您也可以遍历此列表。

顺便说一句，文档中有一个示例，并且有几个集成测试显示了连接的使用方式。

获取超过 25 个帖子时出现异常 restFb

Exception while fetching more than 25 posts restFb

java

facebook

restfb

facebook-graph-api