如何保存文件从网站到SD卡 [英] How to save file from website to sdcard

问题描述

有谁知道如何通过WiFi从网络服务器（本地主机）的文件保存到SD卡？

Does anyone know how to save a file from a webserver(local host) to the sdcard through wifi?

我做XML解析到我的应用程序，为此，我必须从本地主机到SD卡下载一个XML文件，然后标记解析。我坚持下载xml文件到SD卡。请指导我如何做到这一点。

I am doing xml parsing to my application and for that I have to download an xml file from localhost to the sdcard and then tag the parsing. I am stuck with downloading an xml file to the sd card. Please guide me on how to do this..

推荐答案

您可以使用此方法来从互联网上下载文件到您的SD卡：

You can use this method to download a file from the internet to your SD card:

public void DownloadFromUrl(String DownloadUrl, String fileName) {

   try {
           File root = android.os.Environment.getExternalStorageDirectory();               

           File dir = new File (root.getAbsolutePath() + "/xmls");
           if(dir.exists()==false) {
                dir.mkdirs();
           }

           URL url = new URL(DownloadUrl); //you can write here any link
           File file = new File(dir, fileName);

           long startTime = System.currentTimeMillis();
           Log.d("DownloadManager", "download begining");
           Log.d("DownloadManager", "download url:" + url);
           Log.d("DownloadManager", "downloaded file name:" + fileName);

           /* Open a connection to that URL. */
           URLConnection ucon = url.openConnection();

           /*
            * Define InputStreams to read from the URLConnection.
            */
           InputStream is = ucon.getInputStream();
           BufferedInputStream bis = new BufferedInputStream(is);

           /*
            * Read bytes to the Buffer until there is nothing more to read(-1).
            */
           ByteArrayBuffer baf = new ByteArrayBuffer(5000);
           int current = 0;
           while ((current = bis.read()) != -1) {
              baf.append((byte) current);
           }


           /* Convert the Bytes read to a String. */
           FileOutputStream fos = new FileOutputStream(file);
           fos.write(baf.toByteArray());
           fos.flush();
           fos.close();
           Log.d("DownloadManager", "download ready in" + ((System.currentTimeMillis() - startTime) / 1000) + " sec");

   } catch (IOException e) {
       Log.d("DownloadManager", "Error: " + e);
   }

}

您需要下列权限添加到您的Andr​​oidManifest.xml：

You need to add the following permissions to your AndroidManifest.xml:

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"></uses-permission>
<uses-permission android:name="android.permission.READ_PHONE_STATE"></uses-permission>

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