保存XML文件时出现异常

Question

我正在开发一个Android应用程序，我试图从此URL http://data.gov.in/sites/default/files/Date-Wise-Prices-all-Commodity.xml下载XML文件并尝试将此文件保存到我的SD卡中。

我想在点击按钮时下载文件。所以，我在我的Button Click上使用以下代码..

try
    {
        URL url = new URL("http://data.gov.in/sites/default/files/Date-Wise-Prices-all-Commodity.xml");

        //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/"+"XML_folder/");

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

        //which we want to save the file as.

        File file = new File(SDCardRoot,"webservice.xml");

        //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();
    }
    catch(Exception e)
    {
        Toast.makeText(getApplicationContext(), e.getMessage(), Toast.LENGTH_SHORT).show();
    }

由于我使用了try and catch来捕捉异常并向我显示此消息data.gov.in。

所以，我现在做的。

请帮忙。

先谢谢。