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POJava Spring MVC uploading file as byte[]
 

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  1. POJava Spring MVC uploading file as byte[]
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    <p>I have the following problem. </p> <p>I have a ActiveX control written in C++/CLI, which I'm using on client side. one of the control method return binary file by fixed chunk size (for example by 1024). This file is zipped.</p> <p>I need to write method using C++/CLI which will send each file chunk to the server. I have Java Spring MVC method which receives this byte[] chunk and append it to file. In other words I'm just uploading zip file by chunks. </p> <p>My problem is, that although the file size of both files (Original and its copy on server) ,the MD5 checksum of this file is not the same and I can't open this file using zip. The file is corrupted. </p> <p>I'm just taking each chunk byte[] convert it with BASE64 and send it to server using my regular POST request:</p> <p>My code is the following:</p> <pre><code>int SceneUploader::AddChunk(int id, array&lt;Byte&gt; ^buffer,int size){ WebRequest^ request = WebRequest::Create(AddChunkURI); request-&gt;Method = "POST"; request-&gt;ContentType = "application/x-www-form-urlencoded"; System::String ^base64Image = Convert::ToBase64String(buffer); String ^param = "id="+id+"&amp;chunk="+base64Image+"&amp;len="+size; //Just make another copy of the file to verify that sent byted are ok!!! String ^path = "C:\\Users\\dannyl\\AppData\\Local\\Temp\\test.zip"; FileStream ^MyFileStream = gcnew FileStream(path, FileMode::Append, FileAccess::Write); MyFileStream-&gt;Write(buffer,0,size); MyFileStream-&gt;Close(); //Adding the byteArray to the stream. System::IO::Stream ^stream = request-&gt;GetRequestStream(); System::IO::StreamWriter ^streamWriter = gcnew System::IO::StreamWriter(stream); streamWriter-&gt;Write(param); streamWriter-&gt;Close(); HttpWebResponse^ response = dynamic_cast&lt;HttpWebResponse^&gt;(request-&gt;GetResponse()); Stream^ dataStream = response-&gt;GetResponseStream(); StreamReader^ reader = gcnew StreamReader( dataStream ); String^ responseFromServer = reader-&gt;ReadToEnd(); return System::Int32::Parse(responseFromServer); } </code></pre> <p>My MVC controller looks like this:</p> <pre><code> @RequestMapping(value="/addChunk.dlp",method = RequestMethod.POST) @ResponseBody public String addChunk(@RequestParam("id") String id, @RequestParam("chunk") String chunk, @RequestParam("len") String len){ try{ BASE64Decoder decoder = new BASE64Decoder(); Integer length = Integer.decode(len); byte[] decodedBytes = new byte[length]; decodedBytes = decoder.decodeBuffer(chunk.trim()); File sceneFile = new File(VAULT_DIR+id+".zip"); if (!sceneFile.exists()){ sceneFile.createNewFile(); } long fileLength = sceneFile.length(); RandomAccessFile raf = new RandomAccessFile(sceneFile, "rw"); raf.seek(fileLength); raf.write(decodedBytes); raf.close(); } catch(FileNotFoundException ex){ ex.getStackTrace(); System.out.println(ex.getMessage()); return "-1"; } catch(IOException ex){ ex.getStackTrace(); System.out.println(ex.getMessage()); return "-1"; } return "0"; } </code></pre> <p>What am I doing wrong?</p> <p><strong>Update:</strong> the problem solved. Original Base64 String had '+' characters, after the request was submitted to server the chunk parameter was URLdecoded by Spring and all'+' characters were replaced by spaces, as a result zip file was corrupted. Please give me back my +50 of reputation :)</p> <p>Thank you, Danny.</p>
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    1. USdanny.lesnik
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    1. COTag changed from "C++" to "C++/CLI". Despite similar syntax in many places, these are really different languages; C++/CLI has more in common with C# than it does C++.
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      1. USBilly ONeal
    2. COI suggest you try uploading a simple file, then a simple file using base64, then a zipped file using base64. I have had base64 encoding and decoding problems in the past. This is just to be sure that base64 interconversion is happening correctly on both sides.
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      1. USAbhijeet Kashnia
    3. COHow can I send byte array in HTTP request without encoding it with base64?
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