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POJSF streamed download on android device returns .htm file
 

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  1. POJSF streamed download on android device returns .htm file
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    <p>I'm currently facing a weird problem in my webpage on android devices.</p> <p>What I want to do is to allow a user to download a pdf-file to his mobile device. Therefore I provide a download button as in the setup described <a href="https://stackoverflow.com/questions/9584736/jsf-file-download-nullpointerexception-with-view-parameter">here</a>.</p> <p>Everything works fine as long as I use my desktop browser *Mozilla Firefox 10.** but as soon as I change to my mobile device <em>(SGS II, Android vers. 2.3.5)</em> the result of the download depends on the browser-app I'm using.</p> <p><strong>Mozilla and Opera mobile:</strong><br> Both seem to be able to download the file correctly.</p> <p><strong>Any other browser-app (built-in, Dolphin HD,...):</strong><br> Downloads a file either named <code>&lt;filename&gt;.pdf</code> or <code>&lt;filename&gt;.htm</code> which both represent a <strong>.htm</strong>-file showing the html-source of the page.</p> <p><strong>What I've tried:</strong> </p> <ul> <li><p>Used the <code>StreamedContent</code> method out of the <em>PrimeFaces</em> library</p> <pre><code>public StreamedContent getFile() { // prepare file for download // reference webDAV directory and get file as stream this.file = new Helper().getWebDavFile(customerId, fileName); return file; } </code></pre></li> <li><p>Streamed the file manually to the page as described <a href="https://stackoverflow.com/questions/9391838/how-to-stream-a-file-download-in-a-jsf-backing-bean">here</a>. (Thx to BalusC)</p> <pre><code>public void download() throws IOException { byte[] is = new Helper().getWebDavFileManually(customerId, fileName); FacesContext fc = FacesContext.getCurrentInstance(); ExternalContext ec = fc.getExternalContext(); ec.responseReset(); ec.setResponseContentType("application/pdf"); ec.setResponseHeader("Content-Disposition", "attachment; filename=\"" + fileName.toUpperCase() + "\""); OutputStream output = ec.getResponseOutputStream(); output.write(is); fc.responseComplete(); } </code></pre></li> <li><p>Set an <code>&lt;a href=""&gt;</code> to a local copy of the file.<br> (I'm currently using a <code>&lt;p:commandButton&gt;</code> so I've to use a method executing a redirect instead of returning a String but it works in both ways)</p> <pre><code>public void goToLink() throws IOException { // get WebDAV file and save temporarily byte[] b = new Helper().getWebDavFileManually(customerId, fileName); String path = FacesContext.getCurrentInstance().getExternalContext().getRealPath("/") + fileName; File f = new File(path); try { FileOutputStream fos = new FileOutputStream(f); fos.write(b); link = "http://someurl/somepage/" + fileName; } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } // use link ExternalContext ec = FacesContext.getCurrentInstance().getExternalContext(); ec.redirect(link); } </code></pre> <p>This final approach worked fine even on my android device but I <strong>do not want</strong> to go this route if I can avoid it because the file gets streamed from a WebDAV an I'd have to save each file to the server. This would produce more IO load and would force me to manually clean-up.</p></li> </ul> <p>The methods <code>Helper().getWebDavFile</code> and <code>Helper().getWebDavFileManually</code> either return a <em>DefaultStreamedConten</em> used by PrimeFaces or a <em>byte[]</em> for my own approach.</p> <p><strong>What I know so far:</strong></p> <p>Unfortunately not the solution for my problem :).<br> After many hours of using google I found out that there is the possibility of a <em>double-http-post-request</em>. This would cause androids internal download manager (used in case of broken file download) to send an additional post-request in which the state gets lost.</p> <p>As described in <a href="http://digiblog.de/2011/04/19/android-and-the-download-file-headers/" rel="nofollow noreferrer">this blog</a> (see section <em>GET, POST, REST [UPDATE 20120208]</em>) there is someone facing the same problem. I've tried all approaches mentioned on this blog but didn't succeed.<br> On this <a href="http://androidforums.com/application-development/256987-android-phone-download-issue-asp-net-website.html#post3687287" rel="nofollow noreferrer">forum</a> someone analyzed the same behavior with <em>WireShark</em> and got nearly to the same conclusion.<br> I didn't found any more ressources so I'm stuck at this.</p> <p>I've also posted on the PrimeFaces <a href="http://forum.primefaces.org/viewtopic.php?f=8&amp;t=19055" rel="nofollow noreferrer">forum</a> just to make sure that there aren't any known issues regarding the <code>&lt;p:fileDownload&gt;</code> component.</p> <p><strong>What I would like to know:</strong></p> <p>Am I missing something?<br> Is there any possibility to download a streamed file from an JSF (http-post operating) webpage on an android device?</p> <p>Any help/suggestion/information would be appreciated!<br> <strong>Thanks in advance!</strong></p>
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    1. COThat's a nasty problem. Is a POST *really* mandatory? Look like that's exactly the culprit. You can also perform GET actions on JSF managed beans, even though I'd rather have used a simple servlet for this.
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    2. CO@BalusC Hello again :). No, a POST isn't *really* mandatory. Could you please elaborate your suggestion. I'm quite new to JSF and thougt my view parameter (see [linked](http://stackoverflow.com/questions/9584736/jsf-file-download-nullpointerexception-with-view-parameter) post where you've already helped me) would be enough to perform a GET. I'm also interested in the *servlet* approach. I'll have a [look](http://balusc.blogspot.com/2007/07/fileservlet.html) around and see if I can help myself but any of your famous kick-off examples would be appreciated :). Thank you, cheers!
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