从远程服务器下载文件到Android手机时出现java.io.eofException

Question

我的目标是将远程服务器中的 200 个 .jpg 文件下载到我的 Android 手机(运行 jellybeans)。为了做到这一点，我在循环中运行下面的方法，并将不同的文件名分配给文件名参数。它运行良好，直到我下载了 70 个文件。之后我得到一个 java.io.eofException 。你能帮忙吗？

protected void doDownloadPathwayImageFiles(final String fileName, final int totalNumberOfFiles, final int downloadedFiles) throws Exception {


                File root = android.os.Environment.getExternalStorageDirectory();
                File dir = new File(root.getAbsolutePath() + "/" + UtilConstants.PATHWAY_IMAGE_FOLDER + "/");
                if (dir.exists() == false) {
                    dir.mkdirs();
                }

                try {
                    URL url = new URL(UtilConstants.PATHWAY_FILE_LOCATION + fileName + UtilConstants.IMAGE_FILE_EXTENSION);
                    Log.i("FILE_NAME", "File name is " + fileName);
                    Log.i("FILE_URLLINK", "File URL is " + url);

                    HttpURLConnection conn = (HttpURLConnection) url.openConnection();
                    //conn.setReadTimeout(10000 /* milliseconds */);
                    //conn.setConnectTimeout(15000 /* milliseconds */);
                    conn.setRequestMethod("GET");
                    conn.setDoInput(true);
                    conn.setRequestProperty("Connection", "close");
                    // Starts the query
                    conn.connect();
                    int response = conn.getResponseCode();
                    Log.i("NETWORK_RESPONSE", "The response is___: " + response);

                    // download the file
                    InputStream urlStream = conn.getInputStream();
                    InputStream input = new BufferedInputStream(urlStream);

                    OutputStream output = new FileOutputStream(dir + "/" + fileName + UtilConstants.IMAGE_FILE_EXTENSION);

                    //write the file to local directory
                    byte data[] = new byte[1024];
                    long total = 0;
                    int count;
                    while ((count = input.read(data)) != -1) {
                        total += count;
                        output.write(data, 0, count);
                    }

                    output.flush();
                    output.close();
                    input.close();
                    urlStream.close();
                    conn.disconnect();



                    Log.i("Files", "Downloaded " + downloadedFiles);
                    Log.i("Files", "Total " + totalNumberOfFiles);

                    double progressCount = ((double) downloadedFiles / (double) totalNumberOfFiles) * 100;

                    Log.i("percentage", "Progress ++++++++++ " + progressCount);

                    progressBar.setProgress((int) Math.round(progressCount));

                }catch (MalformedURLException e) {
                    throw new MalformedURLException("Error downloading pathway overview images :" + e.getMessage());
                }  catch (IOException e){
                    throw new IOException("Error downloading pathway overview images :" + e.getMessage());
                }  catch (Exception e) {
                    throw new Exception("Error downloading pathway overview images :" + e.getMessage());
                }

        }

Answer 1

也许该文件已损坏？

收到该错误后，您是否尝试再次执行该操作？

例如在抛出异常之后:

 catch (Exception e) {
                throw new Exception("Error downloading pathway overview images :" + e.getMessage());
            }

捕获它并调用该方法 protected void doDownloadPathwayImageFiles(final String fileName, Final int TotalNumberOfFiles, Final int downloadFiles) 在代码中再次抛出异常(即:第三次忽略文件并尝试下载下一步)。