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    <p>We have something similar, except returning images instead of a PDF; should be a similar solution, though, I'm guessing. </p> <p>On a JSP, we have an <code>IMG</code> tag, where the <code>src</code> is set to:</p> <pre><code>&lt;c:url value="/path/getImage.do?imageId=${imageID}" /&gt; </code></pre> <p>(I'm not showing everything, because I'm trying to simplify.) In your case, maybe it would be a link, where the <code>href</code> is done in a similar way.</p> <p>That <code>getImage.do</code> maps to our JPF controller, obviously. Here's the code from the JPF <code>getImage()</code> method, which is the part you're trying to work on:</p> <pre><code>@Jpf.Action(forwards = { @Jpf.Forward(name = FWD_SUCCESS, navigateTo = Jpf.NavigateTo.currentPage), @Jpf.Forward(name = FWD_FAILURE, navigateTo = Jpf.NavigateTo.currentPage) }) public Forward getImage(final FormType pForm) throws Exception { final HttpServletRequest lRequest = getRequest(); final HttpServletResponse lResponse = getResponse(); final HttpSession lHttpSession = getSession(); final String imageIdParam = lRequest.getParameter("imageId"); final long header = lRequest.getDateHeader("If-Modified-Since"); final long current = System.currentTimeMillis(); if (header &gt; 0 &amp;&amp; current - header &lt; MAX_AGE_IN_SECS * 1000) { lResponse.setStatus(HttpServletResponse.SC_NOT_MODIFIED); return null; } try { if (imageIdParam == null) { throw new IllegalArgumentException("imageId is null."); } // Call to EJB, which is retrieving the image from // a separate back-end system final ImageType image = getImage(lHttpSession, Long .parseLong(imageIdParam)); if (image == null) { lResponse.sendError(404, IMAGE_DOES_NOT_EXIST); return null; } lResponse.setContentType(image.getType()); lResponse.addDateHeader("Last-Modified", current); // public: Allows authenticated responses to be cached. lResponse.setHeader("Cache-Control", "max-age=" + MAX_AGE_IN_SECS + ", public"); lResponse.setHeader("Expires", null); lResponse.setHeader("Pragma", null); lResponse.getOutputStream().write(image.getContent()); } catch (final IllegalArgumentException e) { LogHelper.error(this.getClass(), "Illegal argument.", e); lResponse.sendError(404, IMAGE_DOES_NOT_EXIST); } catch (final Exception e) { LogHelper.error(this.getClass(), "General exception.", e); lResponse.sendError(500); } return null; } </code></pre> <p>I've actually removed very little from this method, because there's very little in there that I need to hide from prying eyes--the code is pretty generic, concerned with images, not with business logic. (I changed some of the data type names, but no big deal.)</p>
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