/**
 * 是否收藏(有没有感觉这段代码特别特别啰嗦,不够简洁)
 * @param articleKey
 * @param user
 * @return
 */
public boolean isFavorite(String articleKey, User user) {
 boolean isFavorite = false;
 if (user == null) {
 return false;
 }
 long userId = user.getId();
 Article article = getByArticleKey(articleKey);
 if (null == article) {
 return false;
 }
 List<Long> list = listAttentionUsers(article);
 if (list == null || list.size() <= 0) {
 return false;
 }
 for (Long id : list) {
 if (id == userId) {
 isFavorite = true;
 break;
 }
 }
 return isFavorite;
}