We have a very simple setup for exporting data table content to excel: a
commandLink invoking an action method that renders content type
"application/vnd.ms-excel". However we are seeing some really funky
behavior, specifically whenever actions other than exporting to excel are
invoked, the exportHtmlTableToExcel action method still gets executed during
JSF lifecycle, causing the browser to display the Download/Open dialog box
again! Using the debugger I can see the exportHtmlTableToExcel getting
invoked even though it should not be. It's as if the JSF state somehow got
corrupt and/or was not properly reset from the previous cycle involving
Exporting to Excel. Has anyone seen this before? Any suggestions would be
greatly appreciated.
code:
<h:commandLink action="#{backingBean.exportHtmlTableToExcel}"
class="linkCaption">
<t:graphicImage url="images/icon_excel.gif"
alt="#{msg.labelExportQueueSummToExcel}" width="21" height="16" />
<h:outputText value="#{msg.labelExportToExcel}" />
</h:commandLink>
public void exportHtmlTableToExcel() throws IOException {
String contentType = "application/vnd.ms-excel";
FacesContext fc = FacesContext.getCurrentInstance();
String filename = fc.getExternalContext().getUserPrincipal().getName() +
"-" + System.currentTimeMillis()
+ ".xls";
HttpServletResponse response = (HttpServletResponse)
fc.getExternalContext().getResponse();
response.setHeader("Content-disposition", "attachment; filename=" +
filename);
response.setContentType(contentType);
StringBuffer htmlBuffer = new StringBuffer();
...
[write data table content to buffer here]
...
...
PrintWriter out = response.getWriter();
htmlBuffer.append("<HTML>\n");
out.print(htmlBuffer);
out.close();
fc.responseComplete();
}
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