如何使用JSOUP在Android中的URL中从嵌入式URL中获取远程视频的直接链接

Question

我之前曾问过有关如何检索视频文件的嵌入式URL并成功完成的问题。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并根据我的最初问题的答案，我能够获得此嵌入式链接：

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

试图将视频从该URL传输到视频视频时，我一直遇到错误"无法播放视频"。在查看该链接的源头后，我注意到HTML中未引用需要播放的视频文件，而是在JavaScript中引用。如何获得需要播放的视频文件的直接链接？使用JSOUP或其他过程？

URL https://www.wunderground.com/webcams/cadot1/902/video.html?month=11&year=2016&filename=current.mp4的来源显示了<script>括号内所需的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中获取视频的嵌入式URL，例如：

    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: http://stackoverflow.com/a/7745706/1363265
            // 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，我需要在响应数组中的每个JSONOBJECT上执行此操作。

Answer 1

这就是您可以获取文件的方式：

（注意：提取零件仅适用于网站的当前HTML，如果发生更改，则可能无法正常工作！）

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，您可以通过指定.ignoreContentType(true)来获取文件，以避免org.jsoup.UnsupportedMimeTypeException和.maxBodySize(0)删除文件大小的限制。

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

我不知道您是否可以在Android中播放它，但是我认为您可以使用org.apache.commons.io.FileUtils保存它（我在Java SE进行了测试，但不是Android开发环境。）

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