我们在我们的 Android 应用程序中使用 Dropbox API v2 将数据库文件 (.db) 上传到用户的 Dropbox 应用程序文件夹。下面是上传文件的代码：
InputStream inputStream = null;
FileMetadata obj = null;
try {
inputStream = new FileInputStream(dbFile);
obj = mDbxClient.files().uploadBuilder(remoteFilePath)
.withMode(WriteMode.OVERWRITE)
.uploadAndFinish(inputStream);
} catch (DbxException | IOException e) {
obj = null;
mException = e;
} finally {
if (inputStream != null)
try {
inputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
同一文件快速连续上传 3-4 次。现在，当互联网速度很快（4G、Wifi）时一切正常，但是当用户切换到 2G/3G 网络时，文件没有完全上传。回调方法 onUploadComplete() 被调用，但这里的文件大小已大大减小。我附上了一个数据库文件的版本历史。 https://www.dropbox.com/s/s7y43707ic1kqxg/dropbox.jpg?dl=0
您可以看到文件大小突然减小到 104KB。这将成为损坏的数据库文件。
有没有什么办法解决这一问题？我应该更改上传方式吗？（也许使用 UploadSession() 或者 Uploads 不应该被快速连续调用？请指导
编辑：
以下是上传文件的调用：
AsyncTaskCompat.executeParallel(new DropboxUploadFileTask(DropboxClientFactory.getClient(), new DropboxUploadFileTask.Callback() {
@Override
public void onUploadComplete(FileMetadata result) {
String message = result.getName() + " size " + result.getSize() + " modified " +
java.text.DateFormat.getDateTimeInstance().format(result.getClientModified());
Log.i("BKSync upload ends: ", message);
}
@Override
public void onError(Exception e) {
Log.e("BKSync", "Failed to upload file.", e);
}
}, context), glDbName, "");
class DropboxUploadFileTask extends AsyncTask<String, Void, FileMetadata> {
private final DbxClientV2 mDbxClient;
private final Callback mCallback;
private Exception mException;
private Context mContext;
public interface Callback {
void onUploadComplete(FileMetadata result);
void onError(Exception e);
}
DropboxUploadFileTask(DbxClientV2 dbxClient, Callback callback, Context context) {
mDbxClient = dbxClient;
mCallback = callback;
mContext = context;
}
@Override
protected void onPreExecute() {
Log.e("BKSync", "upload starts");
}
@Override
protected void onPostExecute(FileMetadata result) {
Log.e("BKSync", "upload ends");
super.onPostExecute(result);
if (mException != null) {
mCallback.onError(mException);
} else if (result == null) {
mCallback.onError(null);
} else {
mCallback.onUploadComplete(result);
}
}
@Override
protected FileMetadata doInBackground(String... params) {
String dbFileName = params[0];
File dbFile = mContext.getDatabasePath(dbFileName);
String remoteFolderPath = params[1];
String remoteFileName = dbFile.getName();
InputStream inputStream = null;
FileMetadata obj = null;
try {
inputStream = new FileInputStream(dbFile);
obj = mDbxClient.files().uploadBuilder(remoteFolderPath + "/" + remoteFileName)
.withMode(WriteMode.OVERWRITE)
.uploadAndFinish(inputStream);
} catch (DbxException | IOException e) {
obj = null;
mException = e;
Log.e("BKSync", "exception1");
mException.printStackTrace();
} finally {
if (inputStream != null)
try {
inputStream.close();
} catch (IOException e) {
Log.e("BKSync", "exception2");
e.printStackTrace();
}
}
return obj;
}
}
以下是日志：
05-29 12:08:06.322 11232-11232/com.bk E/BKSync: upload starts
05-29 12:08:13.129 11232-11232/com.bk E/BKSync: upload ends
05-29 12:08:13.130 11232-11232/com.bk I/BKSync upload ends:: demo2_local.db size 692224 modified May 29, 2018 12:08:13 PM
05-29 12:08:13.471 11232-11232/com.bk E/BKSync: upload starts
05-29 12:08:22.992 11232-11232/com.bk E/BKSync: upload ends
05-29 12:08:22.993 11232-11232/com.bk I/BKSync upload ends:: demo2_local.db size 692224 modified May 29, 2018 12:08:23 PM
05-29 12:08:45.181 11232-11232/com.bk E/BKSync: upload starts
05-29 12:08:48.692 11232-11232/com.bk E/BKSync: upload starts
05-29 12:08:49.137 11232-11232/com.bk E/BKSync: upload starts
05-29 12:08:51.962 11232-11232/com.bk E/BKSync: upload starts
f05-29 12:09:24.183 11232-30020/com.bk E/BKSync: exception1
05-29 12:09:24.184 11232-30020/com.bk W/System.err: com.dropbox.core.NetworkIOException: Unable to resolve host "content.dropboxapi.com": No address associated with hostname
at com.dropbox.core.DbxUploader.finish(DbxUploader.java:235)
at com.dropbox.core.DbxUploader.uploadAndFinish(DbxUploader.java:106)
at com.dropbox.core.v2.DbxUploadStyleBuilder.uploadAndFinish(DbxUploadStyleBuilder.java:92)
05-29 12:09:24.185 11232-30020/com.bk W/System.err: at com.bk.DropboxUploadFileTask.doInBackground(DropboxUploadFileTask.java:81)
at com.bkbk.DropboxUploadFileTask.doInBackground(DropboxUploadFileTask.java:20)
at android.os.AsyncTask$2.call(AsyncTask.java:304)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
at java.lang.Thread.run(Thread.java:762)
05-29 12:09:24.189 11232-30020/com.bk W/System.err: Caused by: java.net.UnknownHostException: Unable to resolve host "content.dropboxapi.com": No address associated with hostname
at java.net.Inet6AddressImpl.lookupHostByName(Inet6AddressImpl.java:125)
at java.net.Inet6AddressImpl.lookupAllHostAddr(Inet6AddressImpl.java:74)
at java.net.InetAddress.getAllByName(InetAddress.java:752)
at okhttp3.Dns$1.lookup(Dns.java:39)
at okhttp3.internal.connection.RouteSelector.resetNextInetSocketAddress(RouteSelector.java:185)
at okhttp3.internal.connection.RouteSelector.nextProxy(RouteSelector.java:149)
at okhttp3.internal.connection.RouteSelector.next(RouteSelector.java:84)
05-29 12:09:24.190 11232-30020/com.bk W/System.err: at okhttp3.internal.connection.StreamAllocation.findConnection(StreamAllocation.java:213)
at okhttp3.internal.connection.StreamAllocation.findHealthyConnection(StreamAllocation.java:134)
at okhttp3.internal.connection.StreamAllocation.newStream(StreamAllocation.java:113)
at okhttp3.internal.connection.ConnectInterceptor.intercept(ConnectInterceptor.java:42)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121)
05-29 12:09:24.193 11232-30020/com.bk W/System.err: at okhttp3.internal.cache.CacheInterceptor.intercept(CacheInterceptor.java:93)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
05-29 12:09:24.194 11232-30020/com.bk W/System.err: at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121)
at okhttp3.internal.http.BridgeInterceptor.intercept(BridgeInterceptor.java:93)
05-29 12:09:24.195 11232-30020/com.bk W/System.err: at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
at okhttp3.internal.http.RetryAndFollowUpInterceptor.intercept(RetryAndFollowUpInterceptor.java:125)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121)
at okhttp3.RealCall.getResponseWithInterceptorChain(RealCall.java:200)
at okhttp3.RealCall$AsyncCall.execute(RealCall.java:147)
at okhttp3.internal.NamedRunnable.run(NamedRunnable.java:32)
... 3 more
05-29 12:09:24.196 11232-30020/com.bk W/System.err: Caused by: android.system.GaiException: android_getaddrinfo failed: EAI_NODATA (No address associated with hostname)
at libcore.io.Posix.android_getaddrinfo(Native Method)
at libcore.io.ForwardingOs.android_getaddrinfo(ForwardingOs.java:55)
at java.net.Inet6AddressImpl.lookupHostByName(Inet6AddressImpl.java:106)
... 26 more
05-29 12:09:24.211 11232-11232/com.bk E/BKSync: upload ends
Failed to upload file.
05-29 12:09:24.300 11232-11232/com.bk E/BKSync: upload starts
05-29 12:09:24.314 11232-30020/com.bk E/BKSync: exception1
05-29 12:09:24.315 11232-30020/com.bk W/System.err: com.dropbox.core.NetworkIOException: Pipe closed
at com.dropbox.core.DbxUploader.uploadAndFinish(DbxUploader.java:103)
at com.dropbox.core.v2.DbxUploadStyleBuilder.uploadAndFinish(DbxUploadStyleBuilder.java:92)
at com.bk.DropboxUploadFileTask.doInBackground(DropboxUploadFileTask.java:81)
at com.bk.DropboxUploadFileTask.doInBackground(DropboxUploadFileTask.java:20)
at android.os.AsyncTask$2.call(AsyncTask.java:304)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
05-29 12:09:24.316 11232-30020/com.bk W/System.err: at java.lang.Thread.run(Thread.java:762)
Caused by: com.dropbox.core.util.IOUtil$WriteException: Pipe closed
at com.dropbox.core.util.IOUtil.copyStreamToStream(IOUtil.java:61)
at com.dropbox.core.util.IOUtil.copyStreamToStream(IOUtil.java:68)
at com.dropbox.core.util.IOUtil.copyStreamToStream(IOUtil.java:43)
at com.dropbox.core.http.HttpRequestor$Uploader.upload(HttpRequestor.java:98)
at com.dropbox.core.DbxUploader.uploadAndFinish(DbxUploader.java:98)
... 8 more
05-29 12:09:24.318 11232-30020/com.bk W/System.err: Caused by: java.io.IOException: Pipe closed
at java.io.PipedInputStream.checkStateForReceive(PipedInputStream.java:267)
at java.io.PipedInputStream.receive(PipedInputStream.java:233)
at java.io.PipedOutputStream.write(PipedOutputStream.java:149)
at com.dropbox.core.util.IOUtil.copyStreamToStream(IOUtil.java:59)
... 12 more
05-29 12:09:24.441 11232-11232/com.bk E/BKSync: upload ends
05-29 12:09:24.442 11232-11232/com.bk E/BKSync: Failed to upload file.
com.dropbox.core.NetworkIOException: Pipe closed
at com.dropbox.core.DbxUploader.uploadAndFinish(DbxUploader.java:103)
at com.dropbox.core.v2.DbxUploadStyleBuilder.uploadAndFinish(DbxUploadStyleBuilder.java:92)
at com.bk.DropboxUploadFileTask.doInBackground(DropboxUploadFileTask.java:81)
at com.bk.DropboxUploadFileTask.doInBackground(DropboxUploadFileTask.java:20)
at android.os.AsyncTask$2.call(AsyncTask.java:304)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
at java.lang.Thread.run(Thread.java:762)
Caused by: com.dropbox.core.util.IOUtil$WriteException: Pipe closed
at com.dropbox.core.util.IOUtil.copyStreamToStream(IOUtil.java:61)
at com.dropbox.core.util.IOUtil.copyStreamToStream(IOUtil.java:68)
at com.dropbox.core.util.IOUtil.copyStreamToStream(IOUtil.java:43)
at com.dropbox.core.http.HttpRequestor$Uploader.upload(HttpRequestor.java:98)
at com.dropbox.core.DbxUploader.uploadAndFinish(DbxUploader.java:98)
at com.dropbox.core.v2.DbxUploadStyleBuilder.uploadAndFinish(DbxUploadStyleBuilder.java:92)
at com.bk.DropboxUploadFileTask.doInBackground(DropboxUploadFileTask.java:81)
at com.bk.DropboxUploadFileTask.doInBackground(DropboxUploadFileTask.java:20)
at android.os.AsyncTask$2.call(AsyncTask.java:304)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
at java.lang.Thread.run(Thread.java:762)
Caused by: java.io.IOException: Pipe closed
at java.io.PipedInputStream.checkStateForReceive(PipedInputStream.java:267)
at java.io.PipedInputStream.receive(PipedInputStream.java:233)
at java.io.PipedOutputStream.write(PipedOutputStream.java:149)
at com.dropbox.core.util.IOUtil.copyStreamToStream(IOUtil.java:59)
at com.dropbox.core.util.IOUtil.copyStreamToStream(IOUtil.java:68)
at com.dropbox.core.util.IOUtil.copyStreamToStream(IOUtil.java:43)
at com.dropbox.core.http.HttpRequestor$Uploader.upload(HttpRequestor.java:98)
at com.dropbox.core.DbxUploader.uploadAndFinish(DbxUploader.java:98)
at com.dropbox.core.v2.DbxUploadStyleBuilder.uploadAndFinish(DbxUploadStyleBuilder.java:92)
at com.bk.DropboxUploadFileTask.doInBackground(DropboxUploadFileTask.java:81)
at com.bk.DropboxUploadFileTask.doInBackground(DropboxUploadFileTask.java:20)
at android.os.AsyncTask$2.call(AsyncTask.java:304)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
at java.lang.Thread.run(Thread.java:762)
如您所见，应用程序引发的异常。当用户在 4G 上开始上传时出现问题，然后由于来电，网络切换到 3G。Dropbox 上的文件大小会大幅减少。
请帮忙。