朋友推荐了一个比较隐蔽的盗版电影观看网站，网速特别慢观看不爽，就想是不是可以下载下来看，于是就写了这个小工具

首先，你要有能力在网页里面找到这个M3U8的索引文件，相信对于一个开发人员这个应该很容易，通过浏览器F12找到了这个索引文件，如下，我只截取了一部分，这个文件简单讲一下就是把一个视频切分成了好多小片段，而这个文件就是他们的目录文件，找到这个就容易了，接下来，把里面的每个视频片段下载下来合成就可以了。

第一步，下载索引文件

public static String getIndexFile(String urlpath){        try{            URL url = new URL(urlpath);            //下在资源            BufferedReader in = new BufferedReader(new InputStreamReader(url.openStream(),"UTF-8"));            String content = "" ;            String line;            while ((line = in.readLine()) != null) {                content += line + "\n";            }            in.close();            System.out.println(content);            return content;        }catch (Exception e){            e.printStackTrace();        }        return null;    }

#EXTM3U#EXT-X-VERSION:3#EXT-X-TARGETDURATION:8#EXT-X-MEDIA-SEQUENCE:0#EXTINF:4.971633,ba1620338f71656.ts#EXTINF:3.336667,ba1620338f71657.ts#EXTINF:3.336667,ba1620338f71658.ts#EXTINF:3.336667,ba1620338f71659.ts#EXTINF:3.336667,ba1620338f71660.ts#EXTINF:0.266933,ba1620338f71661.ts#EXT-X-ENDLIST

第二步，解析索引文件

public static List analysisIndex(String content){        Pattern pattern = Pattern.compile(".*ts");        Matcher ma = pattern.matcher(content);        List
    
      list = new ArrayList
     
      ();        while(ma.find()){            String s = ma.group();            list.add(s);            System.out.println(s);        }        return list;    }
     
    

解析的数据结果，把索引中的ts部分解析出来，方法很多

ba1620338f7035.tsba1620338f7036.tsba1620338f7037.tsba1620338f7038.tsba1620338f7039.tsba1620338f7040.tsba1620338f7041.tsba1620338f7042.tsba1620338f7043.tsba1620338f7044.tsba1620338f7045.tsba1620338f7046.tsba1620338f7047.ts

第三步，根据第二步的解析结果下载视频片段

public static List
    
      downLoadIndexFile(String preUrlPath,List
     
       urlList){        try{            List
      
        filePathList = new ArrayList
       
        ();            String uuid = UUID.randomUUID().toString().replaceAll("-","");            for(String urlpath:urlList){                URL url = new URL(preUrlPath+urlpath);                //下在资源                DataInputStream dataInputStream = new DataInputStream(url.openStream());                String fileOutPath = rootPath+File.separator+uuid+File.separator+urlpath;                File file = new File(rootPath+File.separator+uuid);                if(!file.exists()){                    file.mkdirs();                }                FileOutputStream fileOutputStream = new FileOutputStream(new File(fileOutPath));                byte[] bytes = new byte[1024];                int length = 0;                while ((length = dataInputStream.read(bytes)) != -1) {                    fileOutputStream.write(bytes, 0, length);                }                System.out.println("下载完成..."+fileOutPath);                dataInputStream.close();                filePathList.add(fileOutPath);            }            return  filePathList;        }catch (Exception e){            e.printStackTrace();        }        return null;    }
       
      
     
    

到这里基本大功告成了，写一个 main方法执行一下就ok了

private static String rootPath = "F:\\m3u8dir";        public static void main(String[] args) {        String indexPath = "https://youku.cdn2-youku.com/20180710/12991_efbabf56/1000k/hls/index.m3u8";        String prePath = indexPath.substring(0,indexPath.lastIndexOf("/")+1);        System.out.println(prePath);        //下载索引文件        String indexStr = getIndexFile(indexPath);        //解析索引文件        List videoUrlList = analysisIndex(indexStr);        //下载视频片段        List
    
      fileList = downLoadIndexFile(prePath,videoUrlList);            }
    

其实还可以补充一步代码合成，额不过着急看电影，就直接用格式工厂合成了，后面会补充

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补充代码，多线程的写法，上面的单线程太慢了，同时补充了一个文件合成的方法，不需要格式工厂了

import java.io.*;import java.net.URL;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.UUID;import java.util.regex.Matcher;import java.util.regex.Pattern;public class DownFileUtil {    private static String rootPath = "F:\\m3u8dir";        public static void main(String[] args) {        String indexPath = "https://youku.cdn2-youku.com/20180710/12991_efbabf56/1000k/hls/index.m3u8";        String prePath = indexPath.substring(0,indexPath.lastIndexOf("/")+1);        System.out.println(prePath);        //下载索引文件        String indexStr = getIndexFile(indexPath);        //解析索引文件        List videoUrlList = analysisIndex(indexStr);        //生成文件下载目录        String uuid = UUID.randomUUID().toString().replaceAll("-","");        String fileRootPath = rootPath+File.separator+uuid;        File fileDir = new File(fileRootPath);        if(!fileDir.exists()){            fileDir.mkdirs();        }        //下载视频片段，分成50个线程切片下载        HashMap keyFileMap = new HashMap();        int downForThreadCount = videoUrlList.size()/50;        for(int i=0;i
    
     videoUrlList.size()){                end = videoUrlList.size()-1;            }            new DownFileUtil().new downLoadNode(videoUrlList,i,end,keyFileMap,prePath,fileRootPath).start();        }        //等待下载        while (keyFileMap.size()
     
       keyFileMap){        try {            FileOutputStream fileOutputStream = new FileOutputStream(new File(fileOutPath));            byte[] bytes = new byte[1024];            int length = 0;            for(int i=0;i
      
        list = new ArrayList
       
        ();        while(ma.find()){            String s = ma.group();            list.add(s);            System.out.println(s);        }        return list;    }    class downLoadNode extends  Thread{        private List
        
          list ;        private  int start;        private  int end;        public  HashMap keyFileMap ;        private  String preUrlPath ;        private  String fileRootPath ;        public  downLoadNode(List list,int start,int end,HashMap keyFileMap,String preUrlPath,String fileRootPath){            this.list = list;            this.end = end;            this.start = start;            this.keyFileMap = keyFileMap;            this.preUrlPath = preUrlPath;            this.fileRootPath = fileRootPath;        }        @Override        public void run(){            try{                String uuid = UUID.randomUUID().toString().replaceAll("-","");                for( int i = start;i<=end;i++){                    String urlpath = list.get(i);                    URL url = new URL(preUrlPath+urlpath);                    //下在资源                    DataInputStream dataInputStream = new DataInputStream(url.openStream());                    String fileOutPath = fileRootPath+File.separator+urlpath;                    FileOutputStream fileOutputStream = new FileOutputStream(new File(fileOutPath));                    byte[] bytes = new byte[1024];                    int length = 0;                    while ((length = dataInputStream.read(bytes)) != -1) {                        fileOutputStream.write(bytes, 0, length);                    }                    dataInputStream.close();                    keyFileMap.put(i,fileOutPath);                }                System.out.println("第"+start/(end-start)+"组完成，"+"开始位置"+start+",结束位置"+end);            }catch (Exception e){                e.printStackTrace();            }        }    }    public static String getIndexFile(String urlpath){        try{            URL url = new URL(urlpath);            //下在资源            BufferedReader in = new BufferedReader(new InputStreamReader(url.openStream(),"UTF-8"));            String content = "" ;            String line;            while ((line = in.readLine()) != null) {                content += line + "\n";            }            in.close();            System.out.println(content);            return content;        }catch (Exception e){            e.printStackTrace();        }        return null;    }}
        
       
      
     
    

补充：部分ts文件被加密的问题

第一步：找到解密的key，一般会在某个请求中返回（额找不到没法解密）

#EXT-X-KEY:METHOD=AES-128,URI="/20180125/NfJJpxIH/1482kb/hls/key.key"

第二步：根据 AES  对ts进行解密，java可以实现可以自行百度一下

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