Spring Social Facebook:如何从Post获得大照片? [英] Spring Social Facebook: How to get big photo from Post?

问题描述

Post对象具有属性getPicture().其中包含一个非常小的(130×130)图片的网址.

The Post object has a property getPicture(). This contains an url to a very small (130 × 130) image.

如何获得Facebook帖子的全景图?

How to get the big picture of a Facebook post?

示例网址:

https://scontent.xx.fbcdn.net/v/t1.0-0/s130x130/13173717_10209376327474891_7842199861010585961_n.jpg?oh=d244df2db666e1d3be73cb7b76060337&oe=57A64C44

替换url中的s130x130无济于事，因为这在新的Graph API中不起作用.

It does not help to replace the s130x130 in the url because that won't work in the new Graph API.

我尝试使用graphApi.mediaOperations()，但没有看到接受postId的方法.有graphApi.mediaOperations().getPhotos(objectID)，但是根据文档，此objectID必须是AlbumID或UserID，并且此方法会引发异常:

I tried to use graphApi.mediaOperations() but I don't see a method that accepts a postId. There is graphApi.mediaOperations().getPhotos(objectID) but this objectID has to be an AlbumID or UserID according to the documentation and this method throws an exception:

org.springframework.social.UncategorizedApiException: (#100) Tried accessing nonexisting field (photos) on node type (Photo)

，我发现了一些可行的方法:

I found something that works:

byte[] photo = graphApi.mediaOperations().getAlbumImage(post.getObjectId(), ImageType.NORMAL);

但是现在我得到了byte []而不是url，所以现在我必须将图像存储在:(

But now I get a byte[] instead of an url so now I have to store the image somewhere :(

推荐答案

我没有使用Spring Social框架直接获取Facebook帖子全图的任何直接方法.我使用Facebook的graph API来获取完整图片.我添加的代码仅供参考.您需要根据需要进行自定义.

i didn't get any direct method to fetch full_picture of Facebook post using Spring Social framework. I used Facebook's graph API to get full picture. I am adding code for references only. you need to be customize as per you need.

FacebookTemplate facebook = new FacebookTemplate("<fb token>");

String[] ALL_POST_FIELDS = { "id", "actions", "admin_creator", "application", "caption", "created_time", "description", "from", "icon",
        "is_hidden", "is_published", "link", "message", "message_tags", "name", "object_id", "picture", "full_picture", "place", "privacy",
        "properties", "source", "status_type", "story", "to", "type", "updated_time", "with_tags", "shares", "likes.limit(1).summary(true)" };

URIBuilder uriBuilder = URIBuilder.fromUri(facebook.getBaseGraphApiUrl() + request.getAccountId() + "/posts");
uriBuilder = uriBuilder.queryParam("limit", String.valueOf(request.getRecordCount()));
uriBuilder.queryParam("fields", org.springframework.util.StringUtils.arrayToCommaDelimitedString(ALL_POST_FIELDS));
URI uri = uriBuilder.build();
LOGGER.info("facebook URL :{} ", uri);
JsonNode jsonNode = (JsonNode) facebook.getRestTemplate().getForObject(uri, JsonNode.class);
LOGGER.debug("facebook URL :{}, response: {} ", uri, jsonNode);
// you can cast jsonnode as required into your format or below line can be used to cast into PagedList<Post> format
PagedList<Post> posts = new DeserializingPosts().deserializeList(jsonNode, null, Post.class, true);

然后将jsonNode代码转换为所需的格式.或者您也可以使用下面的DeserializingPosts类将其强制转换为PagedList<Post>.

Then jsonNode code be cast into your required format. or you can also cast it to PagedList<Post> using below DeserializingPosts class.

@Component
public class DeserializingPosts extends AbstractOAuth2ApiBinding {

    private ObjectMapper objectMapper = new ObjectMapper();

    private static final Logger LOGGER = Logger.getLogger(DeserializingPosts.class);

    public <T> PagedList<T> deserializeList(JsonNode jsonNode, String postType, Class<T> type, boolean accountFlag) {
        JsonNode dataNode = jsonNode.get("data");
        return deserializeList(dataNode, postType, type);
    }


    public <T> PagedList<T> deserializeList(JsonNode jsonNode, String postType, Class<T> type) {
        List posts = new ArrayList();
        for (Iterator iterator = jsonNode.iterator(); iterator.hasNext();) {
            posts.add(deserializePost(postType, type, (ObjectNode) iterator.next()));
        }
        if (jsonNode.has("paging")) {
            JsonNode pagingNode = jsonNode.get("paging");
            PagingParameters previousPage = PagedListUtils.getPagedListParameters(pagingNode, "previous");
            PagingParameters nextPage = PagedListUtils.getPagedListParameters(pagingNode, "next");
            return new PagedList(posts, previousPage, nextPage);
        }

        return new PagedList(posts, null, null);
    }


    public <T> T deserializePost(String postType, Class<T> type, ObjectNode node) {
        try {
            if (postType == null) {
                postType = determinePostType(node);
            }

            node.put("postType", postType);
            node.put("type", postType);
            MappingJackson2HttpMessageConverter converter = super.getJsonMessageConverter();
            this.objectMapper = new ObjectMapper();
            this.objectMapper.registerModule(new FacebookModule());
            converter.setObjectMapper(this.objectMapper);
            return this.objectMapper.reader(type).readValue(node.toString());
        } catch (IOException shouldntHappen) {
            throw new UncategorizedApiException("facebook", "Error deserializing " + postType + " post" + shouldntHappen.getMessage(),
                    shouldntHappen);
        }
    }

    private String determinePostType(ObjectNode node) {
        if (node.has("type")) {
            try {
                String type = node.get("type").textValue();
                Post.PostType.valueOf(type.toUpperCase());
                return type;
            } catch (IllegalArgumentException e) {
                LOGGER.error("Error occured while determining post type: " + e.getMessage(), e);
                return "post";
            }
        }
        return "post";
    }

}

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