Ok, below the code I use to create a link that allows to download pdf file
created by jasper on runtime. Hope it helps. Do not hesitate to ask
questions.
public class PdfGenerateLink extends ResourceLink<Void> {
public PdfGenerateLink(final String id, final IModel<Bid> model, final
PdfBuilderFromBidCreator creator) {
super(id, new WebResource() {
@Override
public IResourceStream getResourceStream() {
IResourceStream resourceStream = new
AbstractResourceStreamWriter() {
public void write(OutputStream output) {
try {
generate(output, model.getObject());
} catch (Exception e) {
throw new RuntimeException(e);
}
}
private void generate(OutputStream output, Bid bid)
throws Exception {
PdfOfertaDocumentBuilder pdf = creator.create(bid);
InputStream generate = pdf.generate();
byte[] buffer = new byte[1024];
while (generate.read(buffer) != -1) {
output.write(buffer);
}
generate.close();
}
public String getContentType() {
return "application/pdf";
}
};
return resourceStream;
}
@Override
protected void setHeaders(WebResponse response) {
super.setHeaders(response);
response.setCharacterEncoding("UFT-8");
response.setHeader("Expires", "0");
response.setHeader("Cache-Control", "no-cache");
response.setHeader("Cache-Control", "must-revalidate,
post-check=0, pre-check=0");
response.setHeader("Pragma", "public");
response.setAttachmentHeader(model.getObject().getPublicTask().getName().replace("
", "_") + ".pdf");
}
});
add(createImage("icon", "pdficon16.png"));
}
}
On Tue, Oct 18, 2011 at 8:43 PM, Jim Pinkham <pinkh...@gmail.com> wrote:
> Paul,
>
> I am doing something very similar - I'd be interested to know more about
> how you got this working - here is what I've got that works for now, but I'm
> not real happy with it:
>
> In my report forms, I have buttons like this: (details about params
> omitted - nothing fancy there)
>
> add(new MyReportResourceButton("pdf", new
> ReportResource("MyReport", new PdfResourceHandler()), paramsModel));
> add(new MyReportResourceButton("xls", new
> ReportResource("MyReport", new XlsResourceHandler()), paramsModel));
>
> (So it will load MyReport.jasper that was compiled and put into resources
> folder by maven plugin during build)
>
> MyReportResourceButton has this:
> @Override
> public final void onResourceRequested() {
> Map<String,Object> params = paramsModel.getObject();
> resource.setReportParameters(params);
> super.onResourceRequested();
> }
>
> and it's superclass MyResourceButton has this:
> @Override
> public void onSubmit() {
> onResourceRequested();
> }
>
> /**
> * @see org.apache.wicket.IResourceListener#onResourceRequested()
> */
> public void onResourceRequested()
> {
> Attributes a = new Attributes(RequestCycle.get().getRequest(),
> RequestCycle.get()
> .getResponse(), null);
> resource.respond(a);
> }
>
>
> At runtime, it basically works, however, it gives me this annoying message
> in my logs multiple times per report request after the report has been
> served and it appears to be trying to just stay on the same page:
>
> 2011-10-13 15:22:42,381 [http-80-12] ERROR
> org.apache.wicket.DefaultExceptionMapper - Unexpected error occurred
> java.lang.IllegalStateException: Header was already written to response!
> at
> org.apache.wicket.protocol.http.HeaderBufferingWebResponse.checkHeader(HeaderBufferingWebResponse.java:64)
> at
> org.apache.wicket.protocol.http.HeaderBufferingWebResponse.sendRedirect(HeaderBufferingWebResponse.java:112)
> at
> org.apache.wicket.request.handler.render.WebPageRenderer.redirectTo(WebPageRenderer.java:136)
> at
> org.apache.wicket.request.handler.render.WebPageRenderer.respond(WebPageRenderer.java:261)
> at
> org.apache.wicket.request.handler.RenderPageRequestHandler.respond(RenderPageRequestHandler.java:139)
> at
> org.apache.wicket.request.cycle.RequestCycle$HandlerExecutor.respond(RequestCycle.java:717)
> at
> org.apache.wicket.request.RequestHandlerStack.execute(RequestHandlerStack.java:63)
> at
> org.apache.wicket.request.RequestHandlerStack.execute(RequestHandlerStack.java:96)
> at
> org.apache.wicket.request.cycle.RequestCycle.processRequest(RequestCycle.java:212)
> at
> org.apache.wicket.request.cycle.RequestCycle.processRequestAndDetach(RequestCycle.java:253)
> at
> org.apache.wicket.protocol.http.WicketFilter.processRequest(WicketFilter.java:160)
> at
> org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:216)
>
> Could you tell me if there is some way this differs from how you (or your
> contractor) are doing it?
>
> Thanks,
> -- Jim.
>
> On Tue, Oct 18, 2011 at 3:58 AM, Paul Szulc <paul.sz...@gmail.com> wrote:
>
>> yeah, ok, my bad
>>
>> resources where under src/main/resource not src/main/resource*s*
>> *
>> *
>> thx Tor
>>
>
>
--
Best regards,
Paul Szulc
http://www.paulszulc.com
