如何在安卓应用程序中解码URL？

我正在尝试编写一个Android应用程序，它应该检索CDN URL的内容，这些内容始终是URL编码的。举个例子，我使用的是youtube URL，因为它们的格式相同。

    public static String getText(String url) throws Exception {
    URL website = new URL(url);
    URLConnection connection = website.openConnection();
    BufferedReader in = new BufferedReader(
                            new InputStreamReader(
                                connection.getInputStream()));

    StringBuilder response = new StringBuilder();
    String inputLine;

    while ((inputLine = in.readLine()) != null) 
        response.append(inputLine);

    in.close();

    return response.toString();
}

/**
 * @param args the command line arguments
 */
public static void main(String[] args) {
    try {
    String page = getText("http://www.youtube.com/watch?v=QH2-TGUlwu4");
    String[] temper = page.split("flashvars=\"");
    page = temper[1];
    temper = page.split("\"     allowscriptaccess=\"always\"");
    page = temper[0];
    temper = page.split("url_encoded_fmt_stream_map=");
    page = temper[1];
    temper = page.split("fallback_host");
    page = temper[0];
    page = page.replaceAll("url%3D", ""); **
    page = URLDecoder.decode(page, "UTF-8"); **
    page = page.replaceAll("hd720&", "hd720"); **
    System.out.println(page);
    
        // TODO code application logic here
    } catch (Exception ex) {
        Logger.getLogger(app.class.getName()).log(Level.SEVERE, null, ex);
    }
}

加星标的代码（可能）给我带来麻烦。系统输出输出

http%3A%2F%2Fo-o.preferred.ord08s01.v3.lscache1.c.youtube.com%2Fvideoplayback%3Fsparams%3Did%252Cexpire%252Cip%252Cipbits%252Citag%252Csource%252Cratebypass%252Ccp%26fexp%3D909708%252C907322%252C908613%26itag%3D44%26ip%3D99.0.0.0%26signature%3D2889261E861AF0E724519652960C1BF31DA5BABD.A621580215B6416151470893E2D07BDE7AFF081E%26sver%3D3%26ratebypass%3Dyes%26source%3Dyoutube%26expire%3D1327316557%26key%3Dyt1%26ipbits%3D8%26cp%3DU0hRTFNMVF9KUUNOMV9LRlhGOlNaUzBvTG1tdEp2%26id%3D407dbe4c6525c2ee&quality=large&

我希望以一种可以将其包装在下载方法中的方式解码该URL。

我已经尝试了 string.replaceAll（） 方法。简而言之，它不起作用

请帮帮我。