Java 解析优酷地址获取视频真实地址

package com.example.testtoast;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.URL;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

public class VideoTools {

	public String getVideoUrl(String htmlUrl) throws JSONException {
		// 正则表达式解析地址，取id
		Pattern p = Pattern.compile(".*id_(\\w+)\\.html");
		String u = htmlUrl;
		Matcher m = p.matcher(u);
		String id = "";
		if (m.find()) {
			id = m.group(1);
		}
		System.out.println(id);

		// String id="XMTgzNDA5OTMy";
		String s = getContent("http://v.youku.com/player/getPlayList/VideoIDS/"
				+ id);
		System.out.print(s);
		JSONObject jsobj = new JSONObject(s);

		JSONArray jsonarr = jsobj.getJSONArray("data");
		System.out.println(jsobj);
		JSONObject obj1 = jsonarr.getJSONObject(0);
		String title = obj1.getString("title");
		double seed = obj1.getDouble("seed");
		JSONObject obj2 = obj1.getJSONObject("streamfileids");
		String mp4id = null;
		String flvid = null;
		String format = null;
		try {
			mp4id = obj2.getString("mp4");
			format = "mp4";
		} catch (JSONException e) {
			System.out.println("没有MP4格式");
			try {
				flvid = obj2.getString("flv");
				format = "flv";
			} catch (JSONException e1) {
				System.out.println("没有FLV格式");
				return "";
			}
		}
		String realfileid = null;
		if (format.equals("mp4")) {
			realfileid = getFileID(mp4id, seed);
		} else {
			realfileid = getFileID(flvid, seed);
		}

		String idLeft = realfileid.substring(0, 8);
		String idRight = realfileid.substring(10);

		String sid = genSid();
		JSONObject obj3 = obj1.getJSONObject("segs");
		JSONArray mp4arr = obj3.getJSONArray(format);
		String VideoUrl = "";
		for (int i = 0; i < mp4arr.length(); i++) {
			JSONObject o = mp4arr.getJSONObject(i);
			String k = o.getString("k");
			String url = "http://f.youku.com/player/getFlvPath/sid/" + sid
					+ "_" + String.format("%1$02X", i) + "/st/" + format
					+ "/fileid/" + idLeft + String.format("%1$02X", i)
					+ idRight + "?K=" + k;
			System.out.println(url);
			VideoUrl += url + "#";
		}
		return VideoUrl;
	}

	private static 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();
	}

	public static String genSid() {
		int i1 = (int) (1000 + Math.floor(Math.random() * 999));
		int i2 = (int) (1000 + Math.floor(Math.random() * 9000));
		return System.currentTimeMillis() + "" + i1 + "" + i2;
	}

	private static 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();
	}

	public static String getContent(String strUrl) {
		try {

			URL url = new URL(strUrl);
			BufferedReader br = new BufferedReader(new InputStreamReader(
					url.openStream()));
			String s = "";
			StringBuffer sb = new StringBuffer("");
			while ((s = br.readLine()) != null) {
				sb.append(s);
			}
			br.close();
			return sb.toString();
		} catch (Exception e) {
			return "error open url:" + strUrl;
		}

	}
}