1 Reply Latest reply on Dec 2, 2009 1:59 PM by janvandam

No 'save as' fileDialog pops up using commandLink

janvandam Dec 1, 2009 6:09 PM

My problem is to download a file rom the server. When using a commandLink like this:

            <a:commandLink id="download"
                        value="Download"
                       action="#{outputFileDialogAction.initDownload(outputFile)}"
                   oncomplete="Richfaces.showModalPanel('dialogActionPanel');" 
             propagation="none"
                     rendered="#{empty from}"
                     reRender="dialogActionPanel"
                  limitToList="true"/>

my backing bean is called and the selected outputFile from my dataTable is handed over to the backing bean. However the code from my backing bean:

    public void executeDownload(OutputFile outputFile) {
         
          FacesContext facesContext = FacesContext.getCurrentInstance();
          ByteArrayOutputStream baos = new ByteArrayOutputStream();
          PrintWriter writer = new PrintWriter(baos);
          writer.write("content", 0, 7);
          writer.write("\n");
          writer.flush();
         writer.close();
         HttpServletResponse response = ((HttpServletResponse)facesContext.getExternalContext().getResponse());
          response.setContentType("text/plain");
          response.addHeader("Content-disposition", "attachment; filename=\"" + "filename" +"\"");
          ServletOutputStream sos;
          try {
               sos = response.getOutputStream();
          
               sos.write(baos.toByteArray());
               sos.flush();
               sos.close();
          } catch (IOException e) {
               // TODO Auto-generated catch block
               e.printStackTrace();
          }
          facesContext.responseComplete();
    }

... does not result in a 'save as' dialog as expected; instead the data ('content') is written to the browser.

If on the other hand, I use an s:link:

            <s:link view="/OutputFileList.xhtml"
                  action="#{outputFileDialogActions.initDownload(outputFile)}" value="Download"
             propagation="none"
                      id="outputFileList2"
                rendered="#{empty from}">
                <s:conversationPropagation type="begin"/>
            </s:link>

I do get a 'save as' popup as desired, however the outputFile parameter is null, so I am not able to retrieve to data I want to download.

Can somebody help me?

1. Re: No 'save as' fileDialog pops up using commandLink

janvandam Dec 2, 2009 1:59 PM (in response to janvandam)

Found the solution myself using

<s:link>

in combination with a parameter:

            <s:link view="/OutputFileList.xhtml"
                  action="#{outputFileDialogActions.download}" value="Download"
             propagation="none"
                      id="outputFileList"
                rendered="#{empty from}">
                <s:conversationPropagation type="begin"/>
                <f:param name="outputFileId" value="${_outputFile.id}" />
            </s:link>

and a @RequestParameter in the backing bean:

    @In
    private EntityManager entityManager;
    
    @RequestParameter
        private long outputFileId;

    
@Begin(join=true)
public void download() {
    OutputFile of = entityManager.find(OutputFile.class, outputFileId);
}

Problem solved.