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POForward to JSP after call to ServletOutputStream
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copied!<p>As near as I can tell, this falls under a "you can't do that". I'm about to re-think my solution and work around it, but I thought that asking here was worth at least a shot.</p> <p>My JSP/Spring/Struts Servlet produces reports, writes them to PDF, and queues them for download, then waits for the user to request more reports. The details aren't too important. I stream the PDF to the server with the following function call:</p> <pre><code>public static void streamFileToBrowser(File docFile, HttpServletResponse response) throws Exception { try { // return file to user // set contextType response.setContentType("application/pdf"); // setting some response headers response.setHeader("Expires", "0"); response.setHeader("Cache-Control", "must-revalidate, post-check=0, pre-check=0"); response.setHeader("Pragma", "public"); response.setHeader("Content-Disposition","attachment; filename=" + docFile.getName() ); ServletOutputStream outs = response.getOutputStream(); byte[] outputFileBytes = util_getBytesFromFile(docFile.getAbsolutePath()); response.setContentLength(outputFileBytes.length); outs.write(outputFileBytes); // byte[] outs.flush(); outs.close(); } catch (Exception e) { throw e; } } </code></pre> <p>That's pretty straight-forward. I use the response's ServletOutputStream object to ship my bits. It works well.</p> <p>However, sometimes I trap some errors that are caused during the generation of the reports. They're informative messages like "There were no orders from account blah-blah-blah". I have a section in my JSP that will catch and display these.</p> <p>So here's the rub: When I have no report to send, I don't call the above function. But I always call something like:</p> <pre><code>return mapping.findForward("pullReports"); </code></pre> <p>as the last line in my ActionForward method and the errors appear. However, if I have bits to send via the streamFileToBrowser() function, my eventual call to mapping.findForward does nothing.</p> <p>A bit of digging tells me that Struts is only able to handle one response to the HttpServletResponse object at a time. I've used it with my call to streamFileToBrowser(), so the eventual call to mapping.findForward(...) does nothing as far as my client is concerned.</p> <p>Anyone else run into this and found a solution?</p>

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