Android：“意外的流结束”exception下载大文件

我正在构建一个Android应用程序，我需要从一个大小为33 MB的URL下载一个文件。

这里的下载任务：

try { int MAX_BUFFER_SIZE = 4096; URL mUrl = new URL(params[0]); HttpURLConnection connection = (HttpURLConnection) mUrl.openConnection(); connection.setRequestMethod("GET"); long length = connection.getContentLength(), downloaded = 0; int read; byte [] buffer = new byte[(((int)length) > MAX_BUFFER_SIZE) ? MAX_BUFFER_SIZE : (int)length]; String filename = getFilename(mUrl); File file = new File (SDCARD_ROOT); if (!file.exists() || !file.isDirectory()){ file.mkdir(); } this.filename = filename; file = new File (SDCARD_ROOT + this.filename); FileOutputStream fos = new FileOutputStream (file); //Start downloading InputStream stream = connection.getInputStream(); while ((read=stream.read(buffer)) > -1){ fos.write(buffer, 0, read); downloaded += read; publishProgress((int) ((float) downloaded/length * 100)); } fos.close(); return 1; } catch (Exception e){ Log.e("REV-PARTS", "Revolver parts error in DownloadTask: " + e.getMessage()); return 2; } 

它适用于小文件（1-15 MB），但它将返回大文件的“意外的流结束”exception。

Answer 1

我有一个答案。 你应该为你的连接添加一个标题。

 connection.setRequestProperty("Accept-Encoding", "identity"); 

这将帮助你。如果它有帮助我…

Answer 2

设置块大小似乎对我有用。

 connection.setChunkedStreamingMode(1048576); 

Answer 3

对于大文件，您需要使用以下代码手动设置连接超时。 我把时间设定为3分钟

  connection.setConnectTimeout(180000); connection.setReadTimeout(180000); 

Answer 4

当你捕获exception时，我尝试使用方法downContinue（），我可以显示我的代码：

 private void downloadApk() { thread1 = new Thread() { public void run() { File oFile = null; try { URL url = new URL(PQGLApplication.resrootURL + "apk/PQGLMap.apk"); HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection(); ReadableByteChannel channel = Channels.newChannel(urlConnection.getInputStream()); oFile = new File(Environment.getExternalStorageDirectory().getAbsolutePath() + "/" + "hy_ht_new/" + "test2" + ".apk"); oFile.setWritable(true); oFile.setReadable(true); if (oFile.exists()) { oFile.delete(); } FileOutputStream fos = new FileOutputStream(oFile); fileSize = urlConnection.getContentLength(); ByteBuffer buffer = ByteBuffer.allocate(1024); int noOfBytes = 0; byte[] data = null; sendApkMessage(0, 0); while ((noOfBytes = channel.read(buffer)) > 0) { data = new byte[noOfBytes]; System.arraycopy(buffer.array(), 0, data, 0, noOfBytes); buffer.clear(); fos.write(data, 0, noOfBytes); downLoadFileSize += noOfBytes; sendApkMessage(1, downLoadFileSize); } fos.flush(); fos.close(); channel.close(); sendApkMessage(2, oFile.getAbsolutePath()); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); downContinue(); } }; }; thread1.start(); } private void downContinue() { continueTime++; try { if (continueTime == 3) { continueTime = 0; sendApkMessage(4, 0); Log.e("what is the fucking continuetime", "continueTime" + continueTime); } else { URL url = new URL(PQGLApplication.resrootURL + "apk/PQGLMap.apk"); HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection(); File oFile = new File(Environment.getExternalStorageDirectory().getAbsolutePath() + "/" + "hy_ht_new/" + "test2" + ".apk"); RandomAccessFile oSavedFile = new RandomAccessFile(oFile, "rw"); FileOutputStream fos = new FileOutputStream(oFile); ReadableByteChannel channel = Channels.newChannel(urlConnection.getInputStream()); // oSavedFile.seek(nPos); ByteBuffer buffer = ByteBuffer.allocate(1024); byte[] data = null; int temp = 0; sendApkMessage(3, oFile.getAbsolutePath()); while ((temp = channel.read(buffer)) > 0) { data = new byte[temp]; System.arraycopy(buffer.array(), 0, data, 0, temp); buffer.clear(); fos.write(data, 0, temp); } fos.flush(); fos.close(); oSavedFile.close(); sendApkMessage(2, oFile.getAbsolutePath()); continueTime = 0; } } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); Log.e("what is the fucking exception", e.toString() + continueTime); downContinue(); } } 

这个downContinue方法用于解决这个问题。至少，文件下载成功！ 我来自中国。我的英语不太好。