无法使用Rome API从Feed中读取图片网址 [英] Unable to read image URL from feed using Rome API

问题描述

我正在使用ROME解析器来解析我的RSS / Atom提要。现在的问题是它没有提供新闻提要/条目的图像URL。问题的部分原因还在于提要不一致，并且他们将图片网址不一致。

I am using ROME parser to parse my RSS/Atom feeds. Now the problem is that it doesn't give image URL of the news feed/entry. Part of the problem is also because feeds are not consistent and they put image urls inconsistently.

BBC新闻将图片网址放在< media：thumbnail ...> 元素

BBC news puts image url inside <media:thumbnail...> element

<item> 
  <title>Dementia in care homes 'more common'</title>  
  <description>Eight out of 10 residents in care homes are now thought to have dementia or severe memory problems, new data shows.</description>  
  <link>http://www.bbc.co.uk/news/health-21579394#sa-ns_mchannel=rss&amp;ns_source=PublicRSS20-sa</link>  
  <guid isPermaLink="false">http://www.bbc.co.uk/news/health-21579394</guid>  
  <pubDate>Tue, 26 Feb 2013 00:28:31 GMT</pubDate>  
  <media:thumbnail width="66" height="49" url="http://news.bbcimg.co.uk/media/images/66064000/jpg/_66064884_c0016428-geriatric_care-spl.jpg"/>  
  <media:thumbnail width="144" height="81" url="http://news.bbcimg.co.uk/media/images/66064000/jpg/_66064885_c0016428-geriatric_care-spl.jpg"/> 
</item>

但是有些新闻提要将图片放在 enclosure 元素中。而且有些Feed根本没有它们。

But some of the news feeds put images inside enclosure element. And some of the feeds don't have them at all.

所以我的问题是;如果它们出现在Feed中，我怎么能得到它们。到目前为止，罗马API一直在为我工作;但现在我陷入了困境。

So my problem is; how can i get them if they are present in the feed. So far Rome API has been working perfectly for me; but now I am stuck at this.

推荐答案

我可以找出从Feed中获取图片网址的方法。部分问题是因为罗马没有使用泛型;因此无法正确读取< media：thumbnail .. 元素，因此丢失了作为属性的图像的url。

I could figure out ways to get image url from the feed. Part of the problem is because Rome doesn't use Generics; so was not able to read <media:thumbnail.. element properly and hence was loosing the url of the image which comes as attribute.

调试后我可以找出确切的参数化类型，然后很容易：）

After debugging i could figure out exact Parameterized type and then it was easy :)

 List<Element> foreignMarkups = (List<Element>) entry.getForeignMarkup();
 for (Element foreignMarkup : foreignMarkups) {
  String imgURL = foreignMarkup.getAttribute("url").getValue(); 
    //read width and height
 }

这个博客帮助我理解了罗马的架构

还有什么我找到了一些新闻提要;图像的url位于Enclosure元素内，如下所示：

Also what i have found is for some of the news feeds; url of the image is inside Enclosure element like below:

< enclosure url =http://www.wired.com/reviews/ wp-content / uploads / 2013/02 / lights_remote_1-200x100.jpgtype =image / jpeglength =48000/>

所以我也在检查 enclosure 元素，如果< media：thumbnail .. 元素不存在于Feed：

So i am also checking in enclosure element if <media:thumbnail.. element is not present in the feed:

  List<SyndEnclosure> encls = entry.getEnclosures();
  if(!encls.isEmpty()){
    for(SyndEnclosure e : encls){
    String imgURL = e.getUrl().toString();
    }                       
  }

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