Downloading files without fileDownloadActionListener - oracle-adf

Question

To download a file without using fileDownloadActionListener I add a button on a page:
<af:commandButton text="Download" id="cb1" partialSubmit="true" actionListener="#{bean.downloadListener}"/>
and in the action listener I write the following:
FacesContext fc = FacesContext.getCurrentInstance();
ExternalContext ec = fc.getExternalContext();
ec.redirect("http://download-server/file");
fc.responseComplete();
The problem is, after the first download the button stops responding to clicks.
I've also tried writing the data to the response stream like this:
FacesContext fc = FacesContext.getCurrentInstance();
ExternalContext ec = fc.getExternalContext();
ec.responseReset();
ec.setResponseContentType("application/xls");
ec.setResponseHeader("Content-Disposition", "attachment; filename=\"report.xls\"");
OutputStream out = ec.getResponseOutputStream();
// write the data
out.close();
fc.responseComplete();
and even getting an HttpServletResponse:
HttpServletResponse resp = (HttpServletResponse)ec.getResponse();
resp.addHeader("Content-Disposition", "attachment; filename=\"report.xls\"");
resp.addHeader("Content-Type", "application/xls");
OutputStream out = resp.getOutputStream();
// write the data
out.close();
fc.responseComplete();
but neither works.
What can I do to make it work?

Answer 1

I've implemented this using a bit of JavaScript:
final FacesContext fc = FacesContext.getCurrentInstance();
final ExtendedRenderKitService erks =
Service.getService(fc.getRenderKit(), ExtendedRenderKitService.class);
erks.addScript(fc, String.format("window.location = '%s';", escapeSingleQuotes(url)));
Or, instead of assigning window.location, download using an inline frame:
erks.addScript(
fc,
String.format("var downloadUrl = '%s';", escapeSingleQuotes(url)) +
"var frame = document.createElement('iframe');" +
"frame.setAttribute('src', downloadUrl);" +
"frame.style.border = '0';" +
"frame.style.clip = 'rect(0 0 0 0)';" +
"frame.style.width = '1px';" +
"frame.style.height = '1px';" +
"frame.style.margin = '-1px';" +
"frame.style.padding = '0';" +
"frame.style.position = 'absolute';" +
"document.body.appendChild(frame);"
);