如何使用 JSoup 从 Android 中的 url 中的嵌入式 url 直接获取远程视频的 link?

How to get direct link of remote video from embedded url within a url in Android using JSoup?

我之前曾问过有关如何检索视频文件的嵌入式 url 的问题,并且已经成功完成了。现在我有一个不同的问题。 WUnderground API 网络摄像头响应的 json 响应给出以下 url:

https://www.wunderground.com/webcams/cadot1/902/show.html

使用 JSoup 并根据我最初问题的答案,我能够得到这个嵌入式 link:

https://www.wunderground.com/webcams/cadot1/902/video.html?month=11&year=2016&filename=current.mp4

在尝试将 "stream" 视频从 url 转换为 VideoView 时,我一直收到错误 "cannot play video"。查看 link 的来源后,我注意到需要播放的视频文件未在 html 中引用,而是 javascript 中引用。如何获取需要播放的视频文件的直接link?使用 JSoup 或其他进程?

url https://www.wunderground.com/webcams/cadot1/902/video.html?month=11&year=2016&filename=current.mp4 的来源在 <script> 括号内显示了所需视频文件的以下内容:

url: "//icons.wunderground.com/webcamcurrent/c/a/cadot1/902/current.mp4?e=1480377508"

我正在使用 JSoup 从响应 url 中获取嵌入的视频 url,如下所示:

    private class VideoLink extends AsyncTask<Void, Void, Void> {
    String title;

    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        mProgressDialog.setTitle("JSOUP Test");
        mProgressDialog.setMessage("Loading...");
        mProgressDialog.setIndeterminate(false);
        mProgressDialog.show();
    }

    @Override
    protected Void doInBackground(Void... params) {
        try {

            // for avoiding javax.net.ssl.SSLProtocolException: handshake alert:  unrecognized_name
            System.setProperty("jsse.enableSNIExtension", "false");

            // WARNING: do it only if security isn't important, otherwise you have
            // to follow this advices: 
            // Create a trust manager that does not validate certificate chains
            TrustManager[] trustAllCerts = new TrustManager[]{new X509TrustManager(){
                public X509Certificate[] getAcceptedIssuers(){return null;}
                public void checkClientTrusted(X509Certificate[] certs, String authType){}
                public void checkServerTrusted(X509Certificate[] certs, String authType){}
            }};

            // Install the all-trusting trust manager
            try {
                SSLContext sc = SSLContext.getInstance("TLS");
                sc.init(null, trustAllCerts, new SecureRandom());
                HttpsURLConnection.setDefaultSSLSocketFactory(sc.getSocketFactory());
            } catch (Exception e) {
                ;
            }

            // Connect to the web site
            Document doc = Jsoup.connect(TEST_URL).get();
            Elements elements = doc.getElementsByClass("videoText");
            // Get the html document title
            for (Element link : elements) {
                String linkHref = link.attr("href");
                // linkHref contains something like video.html?month=11&year=2016&filename=current.mp4
                // TODO check if linkHref ends with current.mp4
                title = linkHref;
            }
        } catch (IOException e) {
            e.printStackTrace();
            mProgressDialog.dismiss();
        }
        return null;
    }

    @Override
    protected void onPostExecute(Void result) {
        // Set title into TextView
        resultTxt.setText(title);
        String resVid = TEST_URL;
        Log.d(TAG, "URL: " + resVid);
        Uri resUri = Uri.parse(resVid);
        try {
            // Start the MediaController
            MediaController mediacontroller = new MediaController(
                    MainActivity.this);
            mediacontroller.setAnchorView(resultVidVw);
            // Get the URL from String VideoURL
            Uri video = Uri.parse(resVid);
            resultVidVw.setMediaController(mediacontroller);
            resultVidVw.setVideoURI(video);

        } catch (Exception e) {
            Log.e("Error", e.getMessage());
            e.printStackTrace();
        }

        resultVidVw.requestFocus();
        resultVidVw.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
            // Close the progress bar and play the video
            public void onPrepared(MediaPlayer mp) {
                mProgressDialog.dismiss();
                resultVidVw.start();
            }
        });
    }
}

请注意,我需要对响应数组中的每个 JSONObject 执行此操作。

这是获取文件的方法:

(注意:提取部分仅适用于站点的当前 html,如果发生变化,它可能无法正常工作!)

String url = "https://www.wunderground.com/webcams/cadot1/902/video.html";
int timeout = 100 * 1000;

// Extract video URL
Document doc = Jsoup.connect(url).timeout(timeout).get();
Element script = doc.getElementById("inner-content")
        .getElementsByTag("script").last();
String content = script.data();
int indexOfUrl = content.indexOf("url");
int indexOfComma = content.indexOf(',', indexOfUrl);
String videoUrl = "https:" + content.substring(indexOfUrl + 6, indexOfComma - 1);
System.out.println(videoUrl);

[输出:https://icons.wunderground.com/webcamcurrent/c/a/cadot1/902/current.mp4?e=1481246112]

现在可以通过指定.ignoreContentType(true)来获取文件以避免org.jsoup.UnsupportedMimeTypeException.maxBodySize(0)解除文件大小限制

// Get video file
byte[] video = Jsoup.connect(videoUrl)
        .ignoreContentType(true).timeout(timeout).maxBodySize(0)
        .execute().bodyAsBytes();

我不知道你是否可以在 Android 中播放它,但我认为你可以使用 org.apache.commons.io.FileUtils 保存它(我在 Java SE 中测试过,但没有 Android开发环境。)

// Save video file
org.apache.commons.io.FileUtils.writeByteArrayToFile(new File("test.mp4"), video);