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POJava: resume Download in URLConnection
 

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    <p>I wrote a program that downloads some files from some servers.<br> Currently program works properly.<br> But I want to add resume support to it.<br> I'm doing it like this But the result file is corrupted: </p> <pre><code>.... File fcheck=new File(SaveDir+"/"+filename); if(resumebox.isSelected() &amp;&amp; fcheck.exists()){ connection.setRequestProperty("Range", "Bytes="+(fcheck.length())+"-"); } connection.setDoInput(true); connection.setDoOutput(true); BufferedInputStream in = new BufferedInputStream (connection.getInputStream()); pbar.setIndeterminate(false); pbar.setStringPainted(true); java.io.FileOutputStream fos ; if(resumebox.isSelected()){ if(fcheck.exists()){ if(connection.getHeaderField("Accept-Ranges").equals("bytes")){ fos = new java.io.FileOutputStream(SaveDir+"/"+filename,true); }else{ fos = new java.io.FileOutputStream(SaveDir+"/"+filename); } }else{ fos = new java.io.FileOutputStream(SaveDir+"/"+filename); } }else{ fos = new java.io.FileOutputStream(SaveDir+"/"+filename); } .... </code></pre> <p>I'm Testing it on a server that I know supports resume.<br> I downloaded some bytes.(72720)<br> Then Tried to resume it.<br> Then I opened file with a Hex editor , At offset 72720 the first Bytes are repeated:<br> Bytes 0-36: FLV.............«..........onMetaData<br> Bytes 72720-72756: FLV.............«..........onMetaData<br> It Starts download from the begining!<br> While when I do it by wget it does correctly and responses by Content-Range field!<br> Server responses with "302 FOUND" and a "206 Partial Content" in wget log.<br> Can "302 FOUND" cause the problem? </p> <p>What is the problem ?<br> Thanks.</p>
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    1. COThe other problem is that you've an unnecessarily deep nested if/else block. Make use of the `&&` operator. I.e. `if (a && b && c) { fos = new FOS(name, true); } else { fos = new FOS(name); }`. That's it. DRY.
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    2. COI summarized code! in those if else blocks I'm rising some messages so it should be as it is. but thank you for your response.
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    3. COThe 302 shouldn't be a problem since HTTPUrlConnection follows redirects by default. Unless you're turning redirects off explicitly, which I doubt since you're actually getting file contents
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