java实现优酷视频地址解析示例代码分享

List<Video> videos = new ArrayList<Video>();
JSONObject data;
//json就是刚获得的响应，类型为String。
data = JSONObject.fromObject(json).getJSONArray("data").getJSONObject(0);
double seed = Double.valueOf(data.getString("seed"));
String title = data.getString("title");
String fileid = data.getJSONObject("streamfileids").getString("flv");//如果要下的是mp4格式的话
String realFileid = getFileID(fileid, seed);            //把flv改成mp4（前提是这个节点存在）
String fileid1 = realFileid.substring(0, 8);//解码出来的id分成两部分，中间要插入视频分段
String fileid2 = realFileid.substring(10);

JSONArray segs = data.getJSONObject("segs").getJSONArray("flv");//segs部分解析
for (Iterator iterator = segs.iterator(); iterator.hasNext();) {
    JSONObject object = (JSONObject) iterator.next();
    int order = object.getInt("no");
    String size = object.getString("size");
    int seconds = object.getInt("seconds");
    String key = object.getString("k");
    String no = String.format("%1$02x", order);
    String youUrl = "http://f.youku.com/player/getFlvPath/sid/" + "00_"
        + no + "/st/flv/fileid/" + fileid1 + no + fileid2 + "?K="
        + key;         
    videos.add(new Video(order, seconds, youUrl, size, key, title));
}

private String getFileID(String fileid, double seed) {
    String mixed = getFileIDMixString(seed);
    String[] ids = fileid.split("\\*");
    StringBuilder realId = new StringBuilder();
    int idx;
    for (int i = 0; i < ids.length; i++) {
        idx = Integer.parseInt(ids[i]);
        realId.append(mixed.charAt(idx));
    }
    return realId.toString();
}

private String getFileIDMixString(double seed) {
    StringBuilder mixed = new StringBuilder();
    StringBuilder source = new StringBuilder(
        "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ/\\:._-1234567890");
    int index, len = source.length();
    for (int i = 0; i < len; ++i) {
        seed = (seed * 211 + 30031) % 65536;
        index = (int) Math.floor(seed / 65536 * source.length());
        mixed.append(source.charAt(index));
        source.deleteCharAt(index);
    }
    return mixed.toString();
}