Problem with downloading file as an attachment

In my application, I use the following code to download a file from the content server WebCenter as an attachment:

public void downloadDocumentAsAttachment(ActionEvent event) {
     try {
          String   contentId = (String) event.getComponent().getAttributes().get("ContentId");
          ContentObj content = this.contentManager.getContentFromContentId(contentId);
           
          FacesContext  facesCtx = FacesContext.getCurrentInstance();
          HttpServletResponse response = (HttpServletResponse) facesCtx.getExternalContext().getResponse();
          response.reset();
          response.setHeader("Content-Disposition", "attachment; filename=\"" + content.getName() + "\"");
          response.setContentType(content.getContentType());

          ServletOutputStream out = response.getOutputStream();
          IOUtils.copy(this.contentManager.downloadContent(contentId), out);
          out.flush();

          facesCtx.responseComplete();

     } catch (Exception ex) {
          ex.printStackTrace();
     }  
}

The "contentManager' is my custom object implemented with CRMI to manage interaction with WebCenter Content server. I tried to print the length of the content to make sure there is actually an InputStream returned by the my object. However, my problem is that on Firefox and Chrome, I do not see a file download dialog box. To be precise, the Chrome, the screen just flashed once and nothing did. On Firefox, I saw the following dialog box:

If I click 'Return', the screen also flashed once and nothing happens as well.

At first, I tried to make use of '< af:fileDownloadActionListener >', I am able to 'see' the file. However, the problem is that my page is completely replaced by the file. I had to click on the back button to return to the original page, and sometimes it has not also that the page has expired. As a result, I implement the download of files as an attachment for the moment.

I would be very grateful if you could show me what I did wrong .

Best regards

James Tran

Thank you very much for spending your time helping me, Johny!

I found the solution. Take a look at the documentation for the "", I now noticed the following description of the attribute "filename":

proposed for the object file name. If you select a "Save file" dialog box typically appears, whether it is ultimately up to the browser. If this isn't the case together, the content will usually line displayed in the browser if possible.

Earlier, I didn't specify the "filename" I read somewhere that it is optional. Thus, my file was posted online to download as an attachment instead.

Tags: Java

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