如何使用Java从URL获取youtube视频ID？

Question

我想使用Java从YouTube网址获取v = id

YouTube网址格式示例：

&a=GxdCwVVULXctT2lYDEPllDR0LRTutYfW
](http://www.youtube.com/watch?v=u8nQa1cJyX8&a=GxdCwVVULXctT2lYDEPllDR0LRTutYfW)
//www.youtube.com/watch?v=u8nQa1cJyX8) //youtu.be/0zM3nApSvMg) http://www.youtube.com/watch？ / user /
IngridMichaelsonVEVO＃p / a / u / 1 / KdwsulMb8EQ

//youtu.be/dQw4w9WgXcQ)
http://www.youtube.com/embed/dQw4w9WgXcQ

http://www.youtube.com/v/dQw4w9WgXcQ
http
：//www.youtube.com/e/dQw4w9WgXcQ
//www.youtube.com/watch?v=dQw4w9WgXcQ)
http://www.youtube.com/?v=dQw4w9WgXcQ
http://www.youtube.com /
watch？feature = player_embedded＆v = dQw4w9WgXcQ

http://www.youtube.com/?feature=player_embedded&v=dQw4w9WgXcQ

http://www.youtube.com/user/IngridMichaelsonVEVO#p/u/11/KdwsulMb8EQ
http://www.youtube-
nocookie.com/v/6L3ZvIMwZFM?version=3&hl=zh_CN&rel=0

或其他任何youtube格式，其中网址中包含视频ID

我正在尝试：-

  Pattern compiledPattern = Pattern.compile("(?<=v=).*?(?=&|$)",Pattern.CASE_INSENSITIVE);      
        Matcher matcher = compiledPattern.matcher(sourceUrl);
        if(matcher.find()){
            setVideoId(matcher.group());
        }

它不只对一个URL有效：

//youtu.be/6UW3xuJinEg)

Answer 1

我找到了解决方案..我扩展了该URL ..及其工作..

public static String expandUrl(String shortenedUrl)  {
        URL url;
        String expandedURL = "";
        try {
            url = new URL(shortenedUrl);
            // open connection
            HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection(Proxy.NO_PROXY); 
            // stop following browser redirect
            httpURLConnection.setInstanceFollowRedirects(false);
            // extract location header containing the actual destination URL
            expandedURL = httpURLConnection.getHeaderField("Location");
            httpURLConnection.disconnect();
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }    
         return expandedURL;
    }