春季社交 Facebook |从 feedOperations 获取大照片答案

【问题标题】：Spring Social Facebook | Get big photo from feedOperations春季社交 Facebook |从 feedOperations 获取大照片
【发布时间】：2017-04-07 11:16:37
【问题描述】：

当我执行下面的代码时，我得到的只是小图片。

PagingParameters recordCount = new PagingParameters(2000, null, null, null);
PagedList<Post> posts = facebook.feedOperations().getPosts(recordCount);

Maven 版本：

<dependency
<groupId>org.springframework.social</groupId>
<artifactId>spring-social-facebook</artifactId> <version>2.0.3.RELEASE</version> 
</dependency>

我们如何才能全面了解 Feed 操作。有什么办法吗？

【问题讨论】：

春季社交 Facebook |从用户帖子或页面获取完整图片。

标签： facebook-graph-api spring-social spring-social-facebook

【解决方案1】：

我为这个问题分析了很多并发布了解决方案，因为其他人可以从中获得帮助。它返回完整图片作为帖子额外数据的一部分，可以使用 post.getExtraData().get("full_picture") 获取。代码截图如下

public PagedList<Post> getPostByAccountId(final String accountId) {
    LOGGER.debug("facebook accountId: ", accountId);
    FacebookTemplate facebook = new FacebookTemplate("<access 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" };

    URIBuilder uriBuilder = URIBuilder.fromUri(facebook.getBaseGraphApiUrl() + "me/posts");
    uriBuilder = uriBuilder.queryParam("limit", String.valueOf(2000));
    uriBuilder.queryParam("fields", org.springframework.util.StringUtils.arrayToCommaDelimitedString(ALL_POST_FIELDS));
    URI uri = uriBuilder.build();

    JsonNode jsonNode = (JsonNode) facebook.getRestTemplate().getForObject(uri, JsonNode.class);
    PagedList<Post> posts = new DeserializingPosts().deserializeList(jsonNode, null, Post.class);
    return posts;
}

从帖子中获取 full_picture。

String picture = post.getPicture(); 
picture = post.getExtraData().get("full_picture") != null ? post.getExtraData().get("full_picture").toString() : picture;

deserializingObject 类详情：

public class DeserializingPosts extends AbstractOAuth2ApiBinding {

private ObjectMapper objectMapper = new ObjectMapper();

/**
 * 
 * @param jsonNode
 * @param postType
 * @param type
 * @return
 */
public <T> PagedList<T> deserializeList(JsonNode jsonNode, String postType, Class<T> type) {
    JsonNode dataNode = jsonNode.get("data");
    List posts = new ArrayList();
    for (Iterator iterator = dataNode.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);
}

/**
 * 
 * @param postType
 * @param type
 * @param node
 * @return
 */
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);
    }
}

/**
 * 
 * @param node
 * @return
 */
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) {
            return "post";
        }
    }
    return "post";
}

}

【讨论】：