HttpURLConnection con = (HttpURLConnection) new URL(url1).openConnection();

con.setConnectTimeout(15000);

con.setReadTimeout(15000);

//有博文说是多次转发的问题，允许它自动重定向，我这边加上之后没啥用

con.setInstanceFollowRedirects(true);

/** 根据URL下载视频

     * @author yys

     * @date 2022/10/17 10:58

     * @param url1 下载地址，bdPath 文件保存路径

     * @return string

     */

    public String downVideo(String url1,String bdPath) throws Exception {

        Map<String, Object> queryJson = new HashMap<String, Object>();

        //example.getVideoUrl()这里就是获取视频的url。

        URL url = new URL(url1);

        //获取文件名称，并且此时的文件名是/开始的，所以先分割获取。

        String file = url.getFile();

        String[] split = file.split("/");

        HttpURLConnection con = null;

        //读文件流

        DataInputStream in = null;

        DataOutputStream out = null;

        try {

            // 获取文件流

            con = (HttpURLConnection) new URL(url1).openConnection();

            con.setConnectTimeout(15000);

            con.setReadTimeout(15000);

            con.setInstanceFollowRedirects(false);

            if (con.getResponseCode() == 302) {

                //如果会重定向，保存302重定向地址，以及Cookies,然后重新发送请求(模拟请求)

                String location = con.getHeaderField("Location");

                con.disconnect();

                url1 = location;

                con = (HttpURLConnection) new URL(url1).openConnection();

                con.setConnectTimeout(15000);

                con.setReadTimeout(15000);

            }

            int code = con.getResponseCode();

            if (code != HttpURLConnection.HTTP_OK) {

                queryJson.put("message","error");

                throw new Exception("文件读取失败");

            }

            //读文件流

            in = new DataInputStream(con.getInputStream());

            out = new DataOutputStream(new FileOutputStream(bdPath));

            byte[] buffer = new byte[2048];

            int count = 0;

            while ((count = in.read(buffer)) > 0) {

                out.write(buffer, 0, count);

            }

        }catch (IOException e) {

            throw new Exception("IOException...");

        }finally {

            out.close();

            in.close();

        }

        queryJson.put("message","success");

        return JSON.toJSONString(queryJson);

    }