Access to response.getOutputStream() via SEAM

[truto]

Hi there.
As I understand, the basic seam+jsf operation consists on the beans to return some tag, that is routed by the faces-config.xml to a proper page.

Is there a way to access directly to the response object from the bean? The idea is to output a binary content on a "download file" button, for example.

Thanks in advance,

[gavin.king]

This is a JSF question, but yes, it is possible, by accessing the JSF ExternalContext.

[truto]

I have found a way that seems to work. Not SEAM related I guess, but JSF dependent.

On a bean's method:

FacesContext context = FacesContext.getCurrentInstance();
HttpServletResponse res = (HttpServletResponse)context.getExternalContext().getResponse();
ServletOutputStream os = res.getOutputStream();

os.println("Content-type: application/vnd.ms-excel");
os.println();
// write content
context.responseComplete();

[truto]

Correction:

HttpServletResponse res = (HttpServletResponse)context.getExternalContext().getResponse();
res.setHeader("Content-type", "application/...");
ServletOutputStream os = res.getOutputStream();
// write content on os

context.responseComplete();

[truto]

Gavin, thanks for you answer, I've only seen it now :-(

[amarinis]

If you do want this to work of osx and probably some other platforms, then you will also need the following line in the code

res.setHeader("Content-disposition", "attachment; filename=aFile.xls");

You may want to store the file name and return that in the above or try to map extensions to mime types. This would depend on its usage.