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POWhy byte array size has 4 bytes offset when uploading and downloading the array?
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  1. POWhy byte array size has 4 bytes offset when uploading and downloading the array?
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    copied!<p>I'm trying to upload image from client to server and get it back to client.</p> <p><strong>Step 1:</strong> uploading image from client to server</p> <pre><code>HttpResponse httpResponse; HttpPost postRequest = new HttpPost(uploadUrl); MultipartEntity entity = new MultipartEntity(); entity.addPart("image", new ByteArrayBody(bitmapArray, "image/jpeg", "image")); postRequest.setEntity(entity); HttpClient httpClient = getHttpClient(); httpResponse = httpClient.execute(postRequest); // bitmapArray.length = 1000 </code></pre> <p><strong>Step 2:</strong> getting the image from client</p> <pre><code>ServletFileUpload upload = new ServletFileUpload(); FileItemIterator iter = upload.getItemIterator(request); FileItemStream imageItem = iter.next(); InputStream imgStream = imageItem.openStream(); </code></pre> <p><strong>Step 3:</strong> sending the image back to client</p> <pre><code>response.setContentType("image/jpeg"); byte[] bArray = IOUtils.toByteArray(imgStream); response.getOutputStream().write(bArray); // bArray.length = 1000 </code></pre> <p><strong>Step 4:</strong> getting the image back from reponse</p> <pre><code>httpResponse = httpClient.execute(postRequest); InputStream is = httpResponse.getEntity().getContent(); byte[] bytes = IOUtils.toByteArray(is); // bytes.length = 1004 </code></pre> <ul> <li>Steps 1 and 4, 2 and 3 are Sequential I separated them to show the flow of them image.</li> </ul> <p>Now suppose that I'm trying to send 1000 bytes image, Before I send the image array at step 1 the length of bitmapArray is 1000.<br> At step 3 after I fetched the image stream and converted it to bArray with IOUtils the length of bArray is remained 1000 so I'm guessing that the image is transferd Ok.<br> <strong>But</strong> in step 4 after I sent the image stream from server to client bytes length is 1004.<br> What am I doing wrong here? </p>
 

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