Question

之前我曾问过如何检索视频文件的嵌入式网址并成功完成此操作的问题。现在我有一个不同的问题。 WUnderground API网络摄像头响应的json响应提供以下URL：

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

使用JSoup并根据我的初始问题的答案，我能够得到这个嵌入式链接：

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

尝试＆＃34;流＆＃34;从该网址到VideoView的视频，我不断收到错误＆＃34;无法播放视频＆＃34;。在查看该链接的来源时，我注意到需要播放的视频文件未在html中引用，而是在javascript中引用。如何获取需要播放的视频文件的直接链接？使用JSoup还是其他进程？

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

url：＆＃34; // icons.wunderground.com/webcamcurrent/c/a/cadot1/902/current.mp4?e=1480377508"

我正在使用JSoup从响应网址获取视频的嵌入式网址，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: 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

这是获取文件的方法：

（注意：提取部分仅适用于网站的当前html，如果更改，则可能无法正常运行！）

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)来获取该文件，以避免org.jsoup.UnsupportedMimeTypeException和.maxBodySize(0)删除文件大小限制。

// 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中测试它但不是Android开发环境。）

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

如何使用JSoup在Android的url中直接链接来自嵌入式URL的远程视频？

1 个答案: