Question

我正在使用java的下载管理器我的下载管理器正常工作，有一些下载链接如果复制某个网站中提供的下载链接并在我的downloader中使用它会产生不适当的结果主要问题是下载文件的实际URL 当我直接在chrome中下载该文件时，我看到的Chrome链接使用的链接与我从网站复制的链接不同我复制的URL实际上重定向到其他URL，这是实际的下载链接如何解决此问题，以便downloader正常工作。

我正在使用以下代码，但它也无效。

private HttpURLConnection checkForRedirect(URL url) throws IOException{
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        //conn.setReadTimeout(5000);
        conn.addRequestProperty("Accept-Language", "en-US,en;q=0.8");
        conn.addRequestProperty("User-Agent", "Mozilla");
        conn.addRequestProperty("Referer", "google.com");

        System.out.println("Request URL ... " + url);

        boolean redirect = false;

        // normally, 3xx is redirect
        int status = conn.getResponseCode();
        if (status != HttpURLConnection.HTTP_OK) {
            if (status == HttpURLConnection.HTTP_MOVED_TEMP
                    || status == HttpURLConnection.HTTP_MOVED_PERM
                    || status == HttpURLConnection.HTTP_SEE_OTHER) {
                redirect = true;
            }
        }

        System.out.println("Response Code ... " + status);
        if (redirect) {

            // get redirect url from "location" header field
            String newUrl = conn.getHeaderField("Location");

            // get the cookie if need, for login
            String cookies = conn.getHeaderField("Set-Cookie");

            // open the new connnection again

            conn = (HttpURLConnection) new URL(newUrl).openConnection();
            conn.setRequestProperty("Cookie", cookies);
            conn.addRequestProperty("Accept-Language", "en-US,en;q=0.8");
            conn.addRequestProperty("User-Agent", "Mozilla");
            conn.addRequestProperty("Referer", "google.com");

            System.out.println("Redirect to URL : " + newUrl);

        }
        return conn;
    }

我传递的网址是 https://class.coursera.org/pythonlearn-003/lecture/download.mp4?lecture_id=19 ，我希望重定向的网址 https://d28rh4a8wq0iu5.cloudfront.net/pythonlearn/recoded_videos/PY4INF-09-Dictionaries.1e3176607c9b11e3a3ad737af77ccaf6.mp4?response-content-type=application%2Foctet-stream&a=1&response-content-disposition=attachment%3B%20filename%3D%2211%2520-%25201%2520-%2520Chapter%25209%2520-%2520Dictionaries%2520%252837%253A38%2529.mp4%22%3B%20filename%2A%3DUTF-8%27%2711%2520-%25201%2520-%2520Chapter%25209%2520-%2520Dictionaries%2520%252837%253A38%2529.mp4

Answer 1

对于您的HttpURLConnection，您可以按照here

所示的重定向进行操作

实际下载链接

1 个答案: