问题
I am trying to download a bunch of files from a PHP server and store them on an sdcard. But when I download the files, I am getting the following error : No of files download from server is **500 -600** after download some files **250 - 260**. It raised an error.
Error
07-10 08:40:46.228: E/File Error(1837): File id is 287 File path is http://192.168.1.21/SOCH/upload/chapter_36/5.9.pdf Synch Path is /mnt/sdcard/SOCH/36/
07-10 08:40:46.268: W/System.err(1837): java.util.concurrent.RejectedExecutionException: Task android.os.AsyncTask$3@434ef2c0 rejected from java.util.concurrent.ThreadPoolExecutor@4364f0d0[Running, pool size = 128, active threads = 128, queued tasks = 128, completed tasks = 1]
07-10 08:40:46.268: W/System.err(1837): at java.util.concurrent.ThreadPoolExecutor$AbortPolicy.rejectedExecution(ThreadPoolExecutor.java:1967)
07-10 08:40:46.268: W/System.err(1837): at java.util.concurrent.ThreadPoolExecutor.reject(ThreadPoolExecutor.java:782)
07-10 08:40:46.268: W/System.err(1837): at java.util.concurrent.ThreadPoolExecutor.execute(ThreadPoolExecutor.java:1303)
07-10 08:40:46.268: W/System.err(1837): at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:589)
07-10 08:40:46.268: W/System.err(1837): at com.soch.webservice.FileTransferService.onStartCommand(FileTransferService.java:146)
07-10 08:40:46.278: W/System.err(1837): at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:2490)
07-10 08:40:46.278: W/System.err(1837): at android.app.ActivityThread.access$1900(ActivityThread.java:130)
07-10 08:40:46.278: W/System.err(1837): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1292)
07-10 08:40:46.278: W/System.err(1837): at android.os.Handler.dispatchMessage(Handler.java:99)
07-10 08:40:46.278: W/System.err(1837): at android.os.Looper.loop(Looper.java:137)
07-10 08:40:46.278: W/System.err(1837): at android.app.ActivityThread.main(ActivityThread.java:4745)
07-10 08:40:46.278: W/System.err(1837): at java.lang.reflect.Method.invokeNative(Native Method)
07-10 08:40:46.278: W/System.err(1837): at java.lang.reflect.Method.invoke(Method.java:511)
07-10 08:40:46.278: W/System.err(1837): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
07-10 08:40:46.278: W/System.err(1837): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
07-10 08:40:46.278: W/System.err(1837): at dalvik.system.NativeStart.main(Native Method)
07-10 08:40:46.278: E/File Error(1837): File id is 288 File path is http://192.168.1.21/SOCH/upload/chapter_37/6.1.pdf Synch Path is /mnt/sdcard/SOCH/37/
07-10 08:40:46.308: W/System.err(1837): java.util.concurrent.RejectedExecutionException: Task android.os.AsyncTask$3@43605840 rejected from java.util.concurrent.ThreadPoolExecutor@4364f0d0[Running, pool size = 128, active threads = 128, queued tasks = 128, completed tasks = 1]
07-10 08:40:46.308: W/System.err(1837): at java.util.concurrent.ThreadPoolExecutor$AbortPolicy.rejectedExecution(ThreadPoolExecutor.java:1967)
07-10 08:40:46.308: W/System.err(1837): at java.util.concurrent.ThreadPoolExecutor.reject(ThreadPoolExecutor.java:782)
07-10 08:40:46.308: W/System.err(1837): at java.util.concurrent.ThreadPoolExecutor.execute(ThreadPoolExecutor.java:1303)
07-10 08:40:46.308: W/System.err(1837): at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:589)
07-10 08:40:46.308: W/System.err(1837): at com.soch.webservice.FileTransferService.onStartCommand(FileTransferService.java:146)
07-10 08:40:46.308: W/System.err(1837): at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:2490)
07-10 08:40:46.308: W/System.err(1837): at android.app.ActivityThread.access$1900(ActivityThread.java:130)
07-10 08:40:46.308: W/System.err(1837): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1292)
07-10 08:40:46.308: W/System.err(1837): at android.os.Handler.dispatchMessage(Handler.java:99)
07-10 08:40:46.308: W/System.err(1837): at android.os.Looper.loop(Looper.java:137)
07-10 08:40:46.308: W/System.err(1837): at android.app.ActivityThread.main(ActivityThread.java:4745)
07-10 08:40:46.308: W/System.err(1837): at java.lang.reflect.Method.invokeNative(Native Method)
07-10 08:40:46.308: W/System.err(1837): at java.lang.reflect.Method.invoke(Method.java:511)
07-10 08:40:46.308: W/System.err(1837): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
07-10 08:40:46.308: W/System.err(1837): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
07-10 08:40:46.308: W/System.err(1837): at dalvik.system.NativeStart.main(Native Method)
Can anybody help me solve this problem? I am using asynchtask to do the download.
My Code is
package com.webservice;
public class FileTransferService extends Service {
private static final int CORE_POOL_SIZE = 1;
private static final int MAXIMUM_POOL_SIZE = 128;
private static final int KEEP_ALIVE = 128 ;
private static final BlockingQueue<Runnable> sPoolWorkQueue = new LinkedBlockingQueue<Runnable>(MAXIMUM_POOL_SIZE);
private static final ThreadFactory sThreadFactory = new ThreadFactory() {
private final AtomicInteger mCount = new AtomicInteger(1);
public Thread newThread(Runnable r) {
return new Thread(r, "AsyncTask #" + mCount.getAndIncrement());
}
};
public static final Executor THREAD_POOL_EXECUTOR = new ThreadPoolExecutor(CORE_POOL_SIZE, MAXIMUM_POOL_SIZE, KEEP_ALIVE,TimeUnit.SECONDS, sPoolWorkQueue,sThreadFactory);
int FileNo = 0;
ArrayList<String> FileId = new ArrayList<String>();
ArrayList<String> ServerPath = new ArrayList<String>();
ArrayList<String> SynchPath = new ArrayList<String>();
ArrayList<String> FileNameList = new ArrayList<String>();
String FileTransferPath = "", SDcardPath = "";
@Override
public void onCreate() {
super.onCreate();
Log.d("Service Created", "Successfully");
FileId.clear();
ServerPath.clear();
SynchPath.clear();
FileNameList.clear();
SDcardPath = Environment.getExternalStorageDirectory().getPath() + "/";
// Get FileTransfer Link From The SD Card
......
// Getting A url From DB
.....
}// End onCreate
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
Log.d("Service Started", "Successfully");
Log.d("fileSize",""+FileId.size());
if (FileId.size() > 0) {
ContentValues mContentValuesUpdatefileStatus = new ContentValues();
mContentValuesUpdatefileStatus.put("Status", 1);
while (FileNo < FileId.size()) {
dbh.updateRecord("Mst_FileTransfer",mContentValuesUpdatefileStatus,"FileTransferId",FileId.get(FileNo));
try {
new DownloadFileFromURL().executeOnExecutor(THREAD_POOL_EXECUTOR,Integer.toString(FileNo));
//new DownloadFileFromURL().execute(Integer.toString(FileNo));
} catch (Exception e) {
e.printStackTrace();
Log.e("File Error", " File id is " + FileId.get(FileNo) + " File path is " + ServerPath.get(FileNo) + " Synch Path is " + SynchPath.get(FileNo));
}
FileNo +=1;
}
}
Log.d("Service Finish", "Successfully");
stopSelf();
return super.onStartCommand(intent, flags, startId);
}
class DownloadFileFromURL extends AsyncTask<String, String, String> {
int Count = 0;
int File_Completed = 0;
int FileNo;
String strServerPath,strSynchPath,strFileName;
@Override
protected void onPreExecute() {
super.onPreExecute();
}
@Override
protected synchronized String doInBackground(String... params) {
FileNo = Integer.parseInt(params[0]);
// Get File Path
strServerPath = ServerPath.get(FileNo).replaceAll(" ", "%20");
strSynchPath = SynchPath.get(FileNo);
strFileName = FileNameList.get(FileNo);
URLConnection mConnection = null;
Log.d("file", strSynchPath + strFileName);
File SynchPath = new File(strSynchPath);
if (!SynchPath.exists()) {
SynchPath.mkdirs();
}
try {
URL url = new URL(strServerPath);
mConnection = url.openConnection();
mConnection.connect();
// getting file length
int lenghtOfFile = mConnection.getContentLength();
// Output stream to write file
File outputFile = new File(SynchPath, strFileName);
FileOutputStream mFileOutputStream = new FileOutputStream(
outputFile);
InputStream mInputStream = url.openStream();
byte data[] = new byte[1024];
long File_Completed_Size = 0;
while ((Count = mInputStream.read(data)) != -1) {
File_Completed_Size += Count;
File_Completed = (int) ((File_Completed_Size * 100) / lenghtOfFile);
// writing data to file
mFileOutputStream.write(data, 0, Count);
}
// flushing output
mFileOutputStream.flush();
// closing streams
mFileOutputStream.close();
mInputStream.close();
} catch (IOException IO) {
Log.e("File Exception"," File id is " + FileId.get(FileNo) + " File path is " + strServerPath + " Synch Path is " + strSynchPath + "FileName " + strFileName);
IO.printStackTrace();
} catch (Exception e) {
Log.e("File Exception"," File id is " + FileId.get(FileNo) + " File path is " + strServerPath + " Synch Path is " + strSynchPath + "FileName " + strFileName);
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
if (File_Completed == 100) {
Log.d("File Downlode Status for " + SynchPath.get(FileNo), "" + File_Completed + "%");
}
}
}
@Override
public IBinder onBind(Intent intent) {
return null;
}
}
回答1:
The bunch is your problem. You exceeded executor pool limits (blind guess is you got more than 10 running at the same time). Use IntentServer do your download in sequence, or use DownloadManager if you target API that already supports it.
来源：https://stackoverflow.com/questions/17326931/download-bunch-of-files-from-server