我有几个文件上传到我的服务器，现在我想要做的是我想逐个下载所有文件并将其保存到一个文件夹中。
所以基本上我试图做[this] [1]这样的事情，但有些我怎么也做不到这一点所以我认为另一种方法可以做到这一点。所以我打算将服务器特定文件夹的所有音频文件下载到我的SD卡文件夹中，然后我将SD卡的路径发送到列表视图并播放该音频。
所以基本上我的问题是如何将所有文件从服务器文件夹下载到我的SD卡文件夹。
我有一段代码可以正常处理单个文件。
public class ServerFileList extends Activity {
Uri uri;
URL urlAudio;
ListView mListView;
ProgressDialog pDialog;
private MediaPlayer mp = new MediaPlayer();
private List<String> myList = new ArrayList<String>();
@Override
protected void onCreate(Bundle savedInstanceState) {
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
super.onCreate(savedInstanceState);
setContentView(R.layout.serverfilelist);
mListView = (ListView) findViewById(R.id.listAudio);
// new getAudiofromServer().execute();
new downloadAudio().execute();
mListView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
playSong(urlAudio + myList.get(position));
}
});
}
public void updateProgress(int currentSize, int totalSize) {
TextView mTextView = new TextView(ServerFileList.this);
mTextView.setText(Long.toString((currentSize / totalSize) * 100) + "%");
}
private void playSong(String songPath) {
try {
mp.reset();
mp.setDataSource(songPath);
mp.prepare();
mp.start();
} catch (IOException e) {
Log.v(getString(R.string.app_name), e.getMessage());
}
}
class downloadAudio extends AsyncTask<String, String, String> {
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(ServerFileList.this);
pDialog.setMessage("Downloading File list from server, Please wait...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(false);
pDialog.show();
}
@Override
protected String doInBackground(String... arg0) {
// set the download URL, a url that points to a file on the internet
// this is the file to be downloaded
URL url = null;
try {
url = new URL("http://server/folder/uploadAudio/abcd.mp3");
} catch (MalformedURLException e3) {
// TODO Auto-generated catch block
e3.printStackTrace();
}
// create the new connection
HttpURLConnection urlConnection = null;
try {
urlConnection = (HttpURLConnection) url.openConnection();
} catch (IOException e5) {
// TODO Auto-generated catch block
e5.printStackTrace();
}
// set up some things on the connection
try {
urlConnection.setRequestMethod("GET");
} catch (ProtocolException e4) {
// TODO Auto-generated catch block
e4.printStackTrace();
}
urlConnection.setDoOutput(true);
// and connect!
try {
urlConnection.connect();
} catch (IOException e3) {
// TODO Auto-generated catch block
e3.printStackTrace();
}
// 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.
String MEDIA_PATH = new String(
Environment.getExternalStorageDirectory()
+ "/newDirectory/");
File SDCardRoot = new File(MEDIA_PATH);
if (!SDCardRoot.exists()) {
SDCardRoot.mkdir();
}
// create a new file, specifying the path, and the filename
// which we want to save the file as.
File file = new File(SDCardRoot, System.currentTimeMillis()
+ ".mp3");
// this will be used to write the downloaded data into the file we
// created
FileOutputStream fileOutput = null;
try {
fileOutput = new FileOutputStream(file);
} catch (FileNotFoundException e2) {
// TODO Auto-generated catch block
e2.printStackTrace();
}
// this will be used in reading the data from the internet
InputStream inputStream = null;
try {
inputStream = urlConnection.getInputStream();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
// 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
try {
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);
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
// close the output stream when done
try {
fileOutput.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
// catch some possible errors...
}
protected void onPostExecute(String file_url) {
if (pDialog.isShowing()) {
pDialog.dismiss();
}
}
}
class getAudiofromServer extends AsyncTask<String, String, String> {
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(ServerFileList.this);
pDialog.setMessage("Getting File list from server, Please wait...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(false);
pDialog.show();
}
@SuppressWarnings("unchecked")
@Override
protected String doInBackground(String... arg0) {
try {
urlAudio = new URL("http://server/folder/uploadAudio");
} catch (MalformedURLException e) {
e.printStackTrace();
}
ApacheURLLister lister1 = new ApacheURLLister();
try {
myList = lister1.listAll(urlAudio);
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
protected void onPostExecute(String file_url) {
if (pDialog.isShowing()) {
pDialog.dismiss();
}
ArrayAdapter<String> adapter = new ArrayAdapter<String>(
ServerFileList.this, android.R.layout.simple_list_item_1,
myList);
adapter.notifyDataSetChanged();
mListView.setAdapter(adapter);
mListView.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
mListView.setCacheColorHint(Color.TRANSPARENT);
}
}
}
答案 0 :(得分：0)
尝试按照步骤
编写一个服务器端组件，它将返回托管所有音频文件的目录中的文件列表。
在你的downloadAudio类中，不是下载文件，而是最初调用上面描述的组件来获取列表。
将您编写的代码移动到将使用String参数的函数中。
在步骤2的网址列表中循环，并在步骤3中调用函数，并将参数作为网址列表的当前元素。
保留所有检查和平衡以确保下载所有文件。
您的问题更多的是设计问题，然后编程。
答案 1 :(得分：0)
我已经通过添加ivy jar文件作为库来解决了这个问题，然后添加了以下代码。
try {
urlAudio = new URL("http://server/folder/uploadAudio");
} catch (MalformedURLException e) {
e.printStackTrace();
}
ApacheURLLister lister1 = new ApacheURLLister();
try {
myList = lister1.listAll(urlAudio);
} catch (IOException e) {
e.printStackTrace();
}
return null;