B站网页端下载视频，直接浏览器下载或者Java实现下载

B站网页端下载视频，只需要调用两个api即可

http://api.bilibili.com/x/web-interface/view?bvid=BV1Zq4y1R7RV

https://api.bilibili.com/x/player/playurl?otype=json&fnver=0&fnval=2&player=1&qn=64&bvid=BV1Zq4y1R7RV&cid=419316130

不嫌麻烦的，也可以用java实现，处理一下返回的json数据就行

	public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.print("请输入BV号：");
        String url = getUrl(scanner.next());
        System.out.print("请输入视频名称：");
        download(url,scanner.next());
    }

    
    public static String getUrl(String bv){
        //根据bv号查询信息，得到cid
        String path = "http://api.bilibili.com/x/web-interface/view?bvid="+bv;
        //得到返回的json数据（HttpUtil.get() 直接发送一个get请求）
        JSONObject json1 = JSONUtil.parseObj(HttpUtil.get(path));
        //获取返回的data数据信息
        JSONObject data1 = JSONUtil.parseObj(json1.get("data"));
        //得到cid
        String cid = data1.get("cid").toString();
        String url = "https://api.bilibili.com/x/player/playurl?otype=json&fnver=0&fnval=2&player=1&qn=64&bvid="+bv+"&cid="+cid+"";
        JSONObject json2 = JSONUtil.parseObj(HttpUtil.get(url));
        JSONObject data2 = JSONUtil.parseObj(json2.get("data"));
        JSONArray durl = JSONUtil.parseArray(data2.get("durl"));
        JSONObject obj = JSONUtil.parseObj(durl.get(0));
        return obj.get("url").toString();
    }

    public static void download(String urlPath,String fileName) {
        try {
            long begin = System.currentTimeMillis();
            URL url = new URL(urlPath);
            //这里因为要设置请求的协议，无法直接使用HttpUtil.get()，所以还是用的 HttpURLConnection来请求的
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setRequestMethod("GET");
            conn.setRequestProperty("Content-Type", "application/json;charset=UTF-8");
            //这里必须要设置bilibili的协议，否则无法下载
            conn.setRequestProperty("Referer", "https://www.bilibili.com");
            conn.setRequestProperty("Sec-Fetch-Mode", "no-cors");
            conn.setRequestProperty("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/77.0.3865.90 Safari/537.36");
            conn.setConnectTimeout(10 * 1000);
            InputStream input = conn.getInputStream();
            FileUtils.copyInputStreamToFile(input, new File("C:\Users\Admin\Downloads\" + fileName + ".flv"));
            input.close();
            long end = System.currentTimeMillis();
            System.out.println("耗时：" + (end - begin) / 1000 + "秒");
            System.out.println("下载完成！");
            conn.disconnect();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }