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PODownload a file through Spring MVC controller using streams
 

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    <p>I am using spring MVC with REST service for one of my project. I am having a service to attach and download user files. I am using below service API for upload and save file into server directory</p> <pre><code>http://myrestserver/attachmentService/attach/userKey </code></pre> <p>And below service API for download files from server directory</p> <pre><code>http://myrestserver/attachmentService/download/userKey/fileKey </code></pre> <p>The issue is that when a file is downloaded, the downloaded URL shows the REST service API URL. To avoid this, I thought of write a controller for attach and download file.</p> <p>I wrote a spring controller which handle file attachment process. Even I wrote a controller(say download.do) for download a file, but when a file downloaded, the file name shows as the same name of the controller(downloaded file name shows <code>"download.do"</code> always) instead of original file name. </p> <p>Below code is from my <code>download.do</code> controller</p> <pre><code>WebResource resource = null; resource = client.resource("http://myrestserver/attachmentService/download/userKey/fileKey"); clientResponse = resource.accept(MediaType.APPLICATION_OCTET_STREAM).get( ClientResponse.class); InputStream inputStream = clientResponse.getEntityInputStream(); if(inputStream != null){ byteArrayOutputStream = new ByteArrayOutputStream(); try { IOUtil.copyStream(inputStream, byteArrayOutputStream); } catch (IOException e) { log.error("Exception in download:"+ e); } } </code></pre> <p>And, in my service API, the code is </p> <pre><code>file = new File(directory, attachmentFileName); fileOutputStream = new FileOutputStream(file); fileOutputStream.write(attachmentContent); fileOutputStream.close(); response = Response.ok((Object) file).type(MediaType.APPLICATION_OCTET_STREAM); response.header("Content-Disposition", "attachment; filename=" + "\"" + attachmentFileName + "\""); return response.build(); </code></pre> <p>By analyzing the issue, I understood that, am not setting file header in downloaded file through <code>download.do</code> controller. If I am using outstream in <code>download.do</code> controller, I will not be able to set the file header. </p> <p>Can any one help me to resolve this issue. My primary aim is to hide my rest service URL from downloaded file by stream through a MVC controller. I found a post (<a href="https://stackoverflow.com/questions/5673260/downloading-a-file-from-spring-controllers">Downloading a file from spring controllers</a> )in stack overflow almost like my question, but the file type is previously known. Please note that, in my application user can attach any type of file.</p>
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