HTTPURLConnection - POST wieloczęściowy/formularz danych z dużym plikiem z FixedLengthStreamingMode

Question

Próbuję wysłać żądanie POST wielostronicowe/dane formularza z dużym obrazem. Nie mogę wstępnie przekonwertować pliku na tablicę bajtów, moja aplikacja ulegnie awarii z wyjątkiem OutOfMemory, więc muszę zapisać zawartość pliku bezpośrednio do strumienia wyjściowego połączenia. Ponadto mój serwer nie obsługuje trybu porcji, więc muszę obliczyć długość zawartości przed wysłaniem danych i użyć ustawienia setFixedLengthStreamingMode.

public void createImagePostWithToken(String accessToken, String text, 
     String type, String imagePath) { 

    URL imageUrl = null; 
    String lineEnd = "\r\n"; 
    String twoHyphens = "--"; 

    // generating byte[] boundary here 

    HttpURLConnection conn = null; 
    DataOutputStream outputStream = null; 
    DataInputStream inputStream = null; 

    int bytesRead, bytesAvailable, bufferSize; 
    byte[] buffer; 
    int maxBufferSize = 1*1024*1024; 

    try 
    { 
     long contentLength; 
     int serverResponseCode; 
     String serverResponseMessage; 
     File file = new File(imagePath);    
     FileInputStream fileInputStream = new FileInputStream(file); 
     imageUrl = buildUri("posts").toURL(); 
     conn = (HttpURLConnection)imageUrl.openConnection(); 
     conn.setConnectTimeout(30000); 
     conn.setReadTimeout(30000); 
     conn.setDoOutput(true); 
     conn.setDoInput(true);   
     conn.setRequestMethod("POST"); 
     conn.setRequestProperty("Content-Type", "multipart/form-data;boundary=" + boundary);    

     String stringForLength = new String(); 

     stringForLength += "Content-Type: multipart/form-data;boundary=" + boundary; 

     stringForLength += twoHyphens + boundary + lineEnd + "Content-Disposition: form-data; name=\"access_token\"" + lineEnd; 
     stringForLength += "Content-Type: text/plain;charset=UTF-8" + lineEnd + "Content-Length: " + accessToken.length() + lineEnd + lineEnd; 
     stringForLength += accessToken + lineEnd + twoHyphens + boundary + lineEnd; 

     stringForLength += "Content-Disposition: form-data; name=\"text\"" + lineEnd; 
     stringForLength += "Content-Type: text/plain;charset=UTF-8" + lineEnd + "Content-Length: " + text.length() + lineEnd + lineEnd; 
     stringForLength += text + lineEnd + twoHyphens + boundary + lineEnd; 

     stringForLength += "Content-Disposition: form-data; name=\"type\"" + lineEnd; 
     stringForLength += "Content-Type: text/plain;charset=UTF-8" + lineEnd + "Content-Length: " + type.length() + lineEnd + lineEnd; 
     stringForLength += type + lineEnd + twoHyphens + boundary + lineEnd; 

     stringForLength += twoHyphens + boundary + lineEnd + "Content-Disposition: form-data; name=\"image\"" + lineEnd; 
     stringForLength += "Content-Type: application/octet-stream" + lineEnd + "Content-Length: " + file.length() + lineEnd + lineEnd; 
     stringForLength += lineEnd + twoHyphens + boundary + twoHyphens + lineEnd; 

     int totalLength = stringForLength.length() + (int)file.length();   
     conn.setFixedLengthStreamingMode(totalLength); 


     outputStream = new DataOutputStream(conn.getOutputStream());   
     outputStream.writeBytes(twoHyphens + boundary + lineEnd); 

     // access token 

     outputStream.writeBytes("Content-Disposition: form-data; name=\"access_token\"" + lineEnd); 
     outputStream.writeBytes("Content-Type: text/plain;charset=UTF-8" + lineEnd); 
     outputStream.writeBytes("Content-Length: " + accessToken.length() + lineEnd); 
     outputStream.writeBytes(lineEnd); 
     outputStream.writeBytes(accessToken + lineEnd); 
     outputStream.writeBytes(twoHyphens + boundary + lineEnd); 

     // text 

     outputStream.writeBytes("Content-Disposition: form-data; name=\"text\"" + lineEnd); 
     outputStream.writeBytes("Content-Type: text/plain;charset=UTF-8" + lineEnd); 
     outputStream.writeBytes("Content-Length: " + text.length() + lineEnd); 
     outputStream.writeBytes(lineEnd); 
     outputStream.writeBytes(text + lineEnd); 
     outputStream.writeBytes(twoHyphens + boundary + lineEnd); 

     // type 

     outputStream.writeBytes("Content-Disposition: form-data; name=\"type\"" + lineEnd); 
     outputStream.writeBytes("Content-Type: text/plain;charset=UTF-8" + lineEnd); 
     outputStream.writeBytes("Content-Length: " + type.length() + lineEnd); 
     outputStream.writeBytes(lineEnd); 
     outputStream.writeBytes(type + lineEnd); 
     outputStream.writeBytes(twoHyphens + boundary + lineEnd); 

     // image 

     outputStream.writeBytes(twoHyphens + boundary + lineEnd); 
     outputStream.writeBytes("Content-Disposition: form-data; name=\"image\"" + lineEnd); 
     //outputStream.writeBytes(lineEnd); 
     outputStream.writeBytes("Content-Type: application/octet-stream" + lineEnd); 
     outputStream.writeBytes("Content-Length: " + file.length() + lineEnd); 
     outputStream.writeBytes(lineEnd);   

     bytesAvailable = fileInputStream.available(); 
     bufferSize = Math.min(bytesAvailable, maxBufferSize); 
     buffer = new byte[bufferSize]; 
     // Read file 
     bytesRead = fileInputStream.read(buffer, 0, bufferSize); 

     while (bytesRead > 0) 
     { 
     outputStream.write(buffer, 0, bufferSize);   
     bytesAvailable = fileInputStream.available(); 
     bufferSize = Math.min(bytesAvailable, maxBufferSize); 
     bytesRead = fileInputStream.read(buffer, 0, bufferSize); 
     } 

     outputStream.writeBytes(lineEnd); 
     outputStream.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd); 

     Log.d("posttemplate", "connection outputstream size is " + outputStream.size()); 

     // finished with POST request body 


    // Responses from the server (code and message) 
     serverResponseCode = conn.getResponseCode(); 
     serverResponseMessage = conn.getResponseMessage(); 

     Log.d("posttemplate", "server response code "+ serverResponseCode); 
     Log.d("posttemplate", "server response message "+ serverResponseMessage); 

     fileInputStream.close(); 
     conn.disconnect(); 
     outputStream.flush(); 
     outputStream.close(); 


    } catch (MalformedURLException e) 
    { 
     Log.d("posttemplate", "malformed url", e); 
     //TODO: catch exception; 
    } catch (IOException e) 
    { 
     Log.d("posttemplate", "ioexception", e); 
     //TODO: catch exception 
    }   

} 

Niestety, moje app ulega awarii z IOException w outputStream.close() i nie mam pojęcia dlaczego:

03-16 13:56:51.035: D/posttemplate(6479): java.io.IOException: unexpected end of stream 
03-16 13:56:51.035: D/posttemplate(6479): at org.apache.harmony.luni.internal.net.www.protocol.http.FixedLengthOutputStream.close(FixedLengthOutputStream.java:57) 
03-16 13:56:51.035: D/posttemplate(6479): at java.io.FilterOutputStream.close(FilterOutputStream.java:66) 
03-16 13:56:51.035: D/posttemplate(6479): at com.futubra.api.impl.PostTemplate.createImagePostWithToken(PostTemplate.java:282) 
03-16 13:56:51.035: D/posttemplate(6479): at com.futubra.FutubraNewPostActivity.createPost(FutubraNewPostActivity.java:128) 
03-16 13:56:51.035: D/posttemplate(6479): at com.futubra.FutubraNewPostActivity_.access$2(FutubraNewPostActivity_.java:1) 
03-16 13:56:51.035: D/posttemplate(6479): at com.futubra.FutubraNewPostActivity_$5.run(FutubraNewPostActivity_.java:141) 
03-16 13:56:51.035: D/posttemplate(6479): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088) 
03-16 13:56:51.035: D/posttemplate(6479): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581) 
03-16 13:56:51.035: D/posttemplate(6479): at java.lang.Thread.run(Thread.java:1019) 

Answer 1

conn.disconnect() po outputStream.close()

Answer 2

dla twojej informacji, Twój kod powinien działać dobrze z połączeniem URL HTTP, ale HTTPS wywoła błąd braku pamięci, ponieważ jest błąd w HttpsURLConnectionImpl.java w systemie Android 2.3.4 (zweryfikowany na moim tablecie), a ten błąd został naprawiony w Androidzie 4.1 (sprawdziłem źródło kod).

Answer 3

Nagłówek HTTP nie jest częścią ciała, więc nie uwzględniaj ich długości ciała.

stringForLength += "Content-Type: multipart/form-data;boundary=" + boundary; 

usunąć powyższą linię, dzięki czemu długość zawartość będzie prawidłowa.

Answer 4

int totalLength = stringForLength.length() + (int)file.length(); 

Powyższy kod jest nieprawidłowy.

Należy użyć bajt długości łańcucha następująco

int totalLength = stringForLength.getBytes().length + (int)file.length();