如何在我的Android应用程序中将网络链接中的dat文件下载到SD卡中的路径？

Question

在应用程序即时开发中，我必须从网络服务器链接下载一个dat文件和一个xml文件。 下载xml没有问题但是在下载dat文件时它会抛出异常。我怎么能过来这个状态。谢谢你们..

例外

    02-01 16:33:34.713: W/System.err(1404): java.io.FileNotFoundException: http://www.myingage.com/bkpdrctry/dontwo.dat
    02-01 16:33:34.723: W/System.err(1404):     at org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:1162)

实际代码如下

    protected static void downloadFile(String stringUrl, String path){
        try {
           URL url = new URL(stringUrl);
           DebugLog.LOGD("URL " +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();

          File SDCardRoot = Environment.getExternalStorageDirectory();
          //create a new file, specifying the path, and the filename
          //which we want to save the file as.
          File file = new File(SDCardRoot,path);
          DebugLog.LOGD("download to sd card " +url );  

          //this will be used to write the downloaded data into the file we created
          FileOutputStream fileOutput = new FileOutputStream(file);
          DebugLog.LOGD("File written successfully in " +path );

          //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;
               //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 some possible errors...
     } catch (MalformedURLException e) {
          e.printStackTrace();
     } catch (IOException e) {
          e.printStackTrace();
     }
  }

上面的函数在这里调用：

    downloadFile("http://www.myingage.com/bkpdrctry/dontwo.xml","/Test/dontwo.xml");
    downloadFile("http://www.myingage.com/bkpdrctry/dontwo.dat","/Test/dontwo.dat");

Answer 1

在浏览器上打开http://www.myingage.com/bkpdrctry/dontwo.dat 。

抛出HTTP 404 。