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POHow to monitor file transfer in Windows using Java?
 

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  1. POHow to monitor file transfer in Windows using Java?
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    <p>I am writing a utility to check whether a very big file has been completely transferred.</p> <p>From what I found online, I understand that the best way is to have the sender send a bite-sized file to indicate that a file transfer is complete. For instance, after sending a 10GB video file <code>bigfile.mov</code>, the sender then sends a 1KB <code>bigfile.txt</code> containing the checksum or something to identify the file; the receiver then polls for <code>bigfile.txt</code>.</p> <p>However, in my case, this approach is not open to me because I have no control of the files being sent to me. Therefore I am resorting to the much more unreliable approach of polling a file a certain number of times in specified intervals, for its file size and last-modified time.</p> <pre><code>public static boolean hasFinished(String sFilename, int polls, int interval) { boolean isDone = true; File file = new File(sFilename); long size = file.length(); long lastModified = file.lastModified(); if (file.isFile()) { for (int i = 0; i &lt; polls; i++) { // sleep a bit try { TimeUnit.SECONDS.sleep(interval); } catch (InterruptedException e) { e.printStackTrace(); } System.out.println("Checking..."); if (file.length() != size || file.lastModified() != lastModified) { isDone = false; break; } } } return isDone; } </code></pre> <p>I am writing this utility on Windows, and I test this by copying a very large file from a temp location to where I want it (say <code>C:\bigfile.mov</code>). The problem is that, once the file copying begins, it seems that both the file size AND the last-modified time are locked in, so even when I test this method while the file is still being copied, I still get <code>true</code> as my result (which is obviously not the case).</p> <p>How should I change my code in this case?</p>
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    1. COTypically, data isn't written to the disk as it's downloaded.
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    2. COAre you transferring from 1 server to another or from 1 directory to another?
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    3. CO@Telthien I don't understand what you mean, could you elaborate?
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