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POJava http download corrupts file
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  1. POJava http download corrupts file
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    copied!<p>I have a problem, which I do not seem to be able to solve... I do a http download of a file, but the CRC32 of the file on the server and on the client do not match. Also, the file has different size, so obviously I must be doing something wrong... when I download via Firefox, the filesize is ok... so I guess it is somewhere in the client code.</p> <p>I already found <a href="https://stackoverflow.com/questions/401748/corrupt-file-when-using-java-to-download-file">Corrupt file when using Java to download file</a>, but that didn't help me either...</p> <p>Here's the code:</p> <pre><code>private void downloadJar(String fileName, long crc32Server) throws IOException { System.out.println("Downloading file '" + fileName + "' from server '" + mServer + "'."); HttpURLConnection sourceConnection = null; BufferedInputStream inputStream = null; BufferedWriter fileWriter = null; long crc32Client; try { URL sourceURL = new URL(fileName); try { sourceConnection = (HttpURLConnection)sourceURL.openConnection(); } catch (MalformedURLException exc) { throw new RuntimeException("Configured URL caused a MalformedURLException: ", exc); } sourceConnection.setRequestProperty("Accept-Encoding", "zip, jar"); sourceConnection.connect(); inputStream = new BufferedInputStream(sourceConnection.getInputStream()); fileWriter = new BufferedWriter(new FileWriter(targetFolder + File.separator + fileName)); CRC32 crc32 = new CRC32(); for (int singleByte = inputStream.read(); singleByte != -1; singleByte = inputStream.read()) { fileWriter.write(singleByte); crc32.update(singleByte); } crc32Client = crc32.getValue(); } finally { if (inputStream != null) { inputStream.close(); } if (fileWriter != null) { fileWriter.flush(); fileWriter.close(); } if (sourceConnection != null) { sourceConnection.disconnect(); } } if (crc32Client != crc32Server) { // deleteFile(fileName); throw new IOException("CRC32 did not match for file '" + fileName + "': " + crc32Client + "!=" + crc32Server); } } </code></pre>
 

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