파일을 업로드하는 동안 비동기 작업에서 오류가 발생했습니다.

Question

이 비동기 작업의 내 코드 갤러리

private class uploadFileAsync extends AsyncTask<String[],Void, Void>{ 

    ProgressDialog dialog = new ProgressDialog(CrimeReportActivity.this); 

    @Override 
     protected void onPreExecute() { 
       // update the UI immediately after the task is executed 
     super.onPreExecute(); 
     dialog.setMessage("Please wait..."); 
     dialog.setIcon(R.drawable.ic_launcher); 
     dialog.setCanceledOnTouchOutside(false); 
     dialog.setCancelable(false); 
     dialog.show(); 
     } 

     @Override 
     protected Void doInBackground(String[]... params) { 


      String fileUploadResp= fs.fileUpload(filePath, uploadURL); 
      System.out.println(fileUploadResp); 
      return null; 
     } 


     @Override 
     protected void onPostExecute(Void result) { 
      super.onPostExecute(result); 
      dialog.dismiss(); 

     } 
} 

에서 이미지를 따기 서버 에 이미지를 업로드하는이 내 업로드 클래스입니다

public class FileShare { 
@SuppressWarnings("deprecation") 
public String fileUpload(String videoPath, String uploadURL) { 

    HttpURLConnection conn = null; 
    DataOutputStream dos = null; 
    DataInputStream inStream = null; 


    String lineEnd = "\r\n"; 
    String twoHyphens = "--"; 
    String boundary = "*****"; 
    int bytesRead, bytesAvailable, bufferSize; 
    byte[] buffer; 
    int maxBufferSize = 10 * 1024 * 1024; 
    try { 
     // ------------------ CLIENT REQUEST 
     FileInputStream fileInputStream = new FileInputStream(new File(
       videoPath)); 
     // open a URL connection to the Servlet 
     URL url = new URL(uploadURL); 
     // Open a HTTP connection to the URL 
     conn = (HttpURLConnection) url.openConnection(); 
     // Allow Inputs 
     conn.setDoInput(true); 
     // Allow Outputs 
     conn.setDoOutput(true); 
     // Don't use a cached copy. 
     conn.setUseCaches(false); 
     // Use a post method. 
     conn.setRequestMethod("POST"); 
     conn.setRequestProperty("Connection", "Keep-Alive"); 
     conn.setRequestProperty("Content-Type", 
       "multipart/form-data;boundary=" + boundary); 
     dos = new DataOutputStream(conn.getOutputStream()); 
     dos.writeBytes(twoHyphens + boundary + lineEnd); 
     dos.writeBytes("Content-Disposition: form-data; name=\"uploadedfile\";filename=\"" 
       + videoPath + "\"" + lineEnd); 
     dos.writeBytes(lineEnd); 
     // create a buffer of maximum size 
     bytesAvailable = fileInputStream.available(); 
     bufferSize = Math.min(bytesAvailable, maxBufferSize); 
     buffer = new byte[bufferSize]; 
     // read file and write it into form... 
     bytesRead = fileInputStream.read(buffer, 0, bufferSize); 
     while (bytesRead > 0) { 
      dos.write(buffer, 0, bufferSize); 
      bytesAvailable = fileInputStream.available(); 
      bufferSize = Math.min(bytesAvailable, maxBufferSize); 
      bytesRead = fileInputStream.read(buffer, 0, bufferSize); 
     } 
     // send multipart form data necesssary after file data... 
     dos.writeBytes(lineEnd); 
     dos.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd); 
     // close streams 
     Log.e("Debug", "File is written"); 
     fileInputStream.close(); 
     dos.flush(); 
     dos.close(); 
    } catch (MalformedURLException ex) { 
     Log.e("Debug", "error: " + ex.getMessage(), ex); 
    } catch (IOException ioe) { 
     Log.e("Debug", "error: " + ioe.getMessage(), ioe); 
    } 
    // ------------------ read the SERVER RESPONSE 
    try { 
     inStream = new DataInputStream(conn.getInputStream()); 

     while ((str = inStream.readLine()) != null) { 
      Log.e("Debug", "Server Response " + str); 
     } 
     inStream.close(); 
    } catch (IOException ioex) { 
     Log.e("Debug", "error: " + ioex.getMessage(), ioex); 
    } 
    return str; 
} 

이것은 로그 캣

 FATAL EXCEPTION: AsyncTask #1 
    java.lang.RuntimeException: An error occured while executing doInBackground() 
    at android.os.AsyncTask$3.done(AsyncTask.java:278) 
at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273) 
at java.util.concurrent.FutureTask.setException(FutureTask.java:124) 
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307) 
at java.util.concurrent.FutureTask.run(FutureTask.java:137) 
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:208) 
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076) 
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569) 
    at java.lang.Thread.run(Thread.java:856) 
    Caused by: java.lang.NullPointerException 
at com.android.internal.os.LoggingPrintStream.println(LoggingPrintStream.java:298) 
at com.pstpl.crimeverify.CrimeReportActivity$uploadFileAsync.doInBackground(CrimeReportActivity.java:376) 
at com.pstpl.crimeverify.CrimeReportActivity$uploadFileAsync.doInBackground(CrimeReportActivity.java:1) 
at android.os.AsyncTask$2.call(AsyncTask.java:264) 
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305) 
... 5 more 

입니다

doinbackground에 serverresponse 문자열을 가져 오려고합니다. 나는 무엇이 잘못 되었습니까?

Answer 1

문제가 해결되었습니다. 수업에서 실수로 보입니다.