如何从服务器上下载XML文件并将其保存在SD卡上？ [英] How to download XML file from server and save it in SD card?

问题描述

在我的应用我试图从服务器上下载XML文件并将其存储在SD card.For此我使用下面的code ..

In my application i'm trying to download XML file from server and storing it in SD card.For this i'm using following code..

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

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

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

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

               /* 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) {
           e.printStackTrace();
       }

这是给我的 java.net.SocketException异常：操作超时例外......请帮助me..I'm新的Andr​​oid开发

this is giving me java.net.SocketException: The operation timed out exception...Please help me..I'm new to android development

推荐答案

您可以使用以下code。这对我的作品

You can use Following code. This works for me

URL url = new URL("some url");

//create the new connection

HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();

//set up some things on the connection

urlConnection.setRequestMethod("GET");

urlConnection.setDoOutput(true);

//and connect!

urlConnection.connect();

//set the path where we want to save the file

//in this case, going to save it on the root directory of the

//sd card.

File SDCardRoot = new File("/sdcard/"+"Some Folder Name/");

//create a new file, specifying the path, and the filename

//which we want to save the file as.

File file = new File(SDCardRoot,"some file name");

//this will be used to write the downloaded data into the file we created

FileOutputStream fileOutput = new FileOutputStream(file);

//this will be used in reading the data from the internet

InputStream inputStream = urlConnection.getInputStream();

//this is the total size of the file

int totalSize = urlConnection.getContentLength();

//variable to store total downloaded bytes

int downloadedSize = 0;

//create a buffer...

byte[] buffer = new byte[1024];

int bufferLength = 0; //used to store a temporary size of the buffer

//now, read through the input buffer and write the contents to the file

while ( (bufferLength = inputStream.read(buffer)) > 0 ) 

{

//add the data in the buffer to the file in the file output stream (the file on the sd card

fileOutput.write(buffer, 0, bufferLength);

//add up the size so we know how much is downloaded

downloadedSize += bufferLength;

int progress=(int)(downloadedSize*100/totalSize);

//this is where you would do something to report the prgress, like this maybe

//updateProgress(downloadedSize, totalSize);

}

//close the output stream when done

fileOutput.close();

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