android download file by stream

最新推荐文章于 2025-01-16 03:15:00 发布

原创最新推荐文章于 2025-01-16 03:15:00 发布 · 868 阅读

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文章标签：

#file #download #stream #android #string #url

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本文介绍了一种使用HTTP异步任务下载文件并将其保存到设备存储空间的方法，包括设置请求头、处理响应流以及文件的正确保存。

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                new AsyncTask<Void, Integer, InputStream>() {
                   InputStream is = null;

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

                       try {
                           URL mUrl = new URL(url);
                           HttpURLConnection c = (HttpURLConnection) mUrl
                                   .openConnection();
                           c.setRequestMethod("POST");

                           String host = null;
                           try {
                               host = new URL(url).getHost();
                           } catch (MalformedURLException e) {
                               e.printStackTrace();
                           }

                           String cookieStr = CookieManager.getInstance()
                                   .getCookie(host);
                           if (!AppUtils.isEmpty(cookieStr)) {
                               c.addRequestProperty("Cookie", cookieStr
                                       + "; AcSe=0");
                           }
                           c.setDoOutput(true);
                           c.connect();
                           is = c.getInputStream();
                       } catch (IOException e) {
                           e.printStackTrace();
                       }
                       return is;
                   }

                   @Override
                   protected void onPostExecute(InputStream result) {
                       String fileName = contentDisposition.replaceFirst(
                               "attachment; filename=", "");
                       try {
                           File file = new File(Environment.getExternalStorageDirectory() + "/" +
                                   Environment.DIRECTORY_DOWNLOADS + "/" +
                                   fileName);
                           OutputStream out = new FileOutputStream(file);
                           byte buf[] = new byte[1024];
                           int len;
                           while ((len = result.read(buf)) > 0) {
                               out.write(buf, 0, len);
                           }
                           out.close();
                           is.close();
                       } catch (Exception e) {
                           e.printStackTrace();
                       }
                       super.onPostExecute(result);
                   }
               }.execute();