无法使用facebook4j阅读facebook评论

Question

我正在尝试使用facebook4j库从帖子中读取facebook评论，并且它仅返回帖子，但不返回该帖子的评论。 即使在任何帖子中有更多评论，它总是返回空白。 有人可以指导我从特定帖子中获取所有评论的正确方法吗？

import facebook4j.Comment;
import facebook4j.Facebook;
import facebook4j.FacebookException;
import facebook4j.FacebookFactory;
import facebook4j.PagableList;
import facebook4j.Post;
import facebook4j.Reading;
import facebook4j.ResponseList;
import facebook4j.auth.AccessToken;

public class PostsFromPageExtractor {

    /**
    * A simple Facebook4J client which
    * illustrates how to access group feeds / posts / comments.
    *
    * @param args
    * @throws FacebookException
    */
    public static void main(String[] args) throws FacebookException {

        // Generate facebook instance.
        Facebook facebook = new FacebookFactory().getInstance();
        // Use default values for oauth app id.
        facebook.setOAuthAppId("", "");
        // Get an access token from:
        // https://developers.facebook.com/tools/explorer
        // Copy and paste it below.
        String accessTokenString = "PASTE_YOUR_ACCESS_TOKEN_HERE";
        AccessToken at = new AccessToken(accessTokenString);
        // Set access token.
        facebook.setOAuthAccessToken(at);

        // We're done.
        // Access group feeds.
        // You can get the group ID from:
        // https://developers.facebook.com/tools/explorer

        // Set limit to 25 feeds.
        ResponseList<Post> feeds = facebook.getFeed("187446750783",new Reading().limit(25));

        // For all 25 feeds...
        for (int i = 0; i < feeds.size(); i++) {
            // Get post.
            Post post = feeds.get(i);
            // Get (string) message.
            String message = post.getMessage();
            // Print out the message.
            System.out.println(message);

            // Get more stuff...
            PagableList<Comment> comments = post.getComments();
            String date = post.getCreatedTime().toString();
            String name = post.getFrom().getName();
            String id = post.getId();
        }
    }
}

String name = "pagename";
ResponseList<Post> feeds = facebook.getFeed(name, new Reading().limit(250));
System.out.println(feeds.size());

Answer 1

我认为在2.4版附近，Facebook现在要求您在发出get请求时指定您感兴趣的字段。 如果您未指定这些字段，则仅返回该帖子。 注释是那些字段之一。

要使字段具体化，您可以使用Reading对象，就像您指定要返回的项目数一样：

// Specify all fields of interest like description, created_time, from, etc.
final Reading reading = new Reading().limit(25).fields("comments"); 
final ResponseList<Post> feeds = facebook.getFeed("187446750783", reading);

其余应相同。