Editing response content on doView()

Question

I have a simple JSR 286 Portlet that displays a user manual (pure HTML code, not JSP).

Actually, my doView method, just contains this :

public class UserManualPortlet extends GenericPortlet
{

    @Override
    protected void doView(RenderRequest request, RenderResponse response)
            throws PortletException, IOException
    {
        PortletRequestDispatcher rd = getPortletContext().getRequestDispatcher(
                "/html/usermanual.html");

        rd.include(request, response);    
    }
}

This works as expected, however I'm having trouble when including images. I'm aware that the path to images should be something like :

<img src='<%=renderResponse.encodeURL(renderRequest.getContextPath() + "/html/image.jpg")%>'/> 

However, my HTML file containing the user manual is used elsewhere, so I would like to preserve it as a pure HTML file.

Is there a way to dynamically replace my classic images urls by something like the example above ? Perhaps using the PrintWriter of the response ?

If such thing is not possible, I thing I would need to generate a JSP file during my Maven build.

Any solution or ideas are welcome.

Answer 1

With JSR-268 portlets you have a better way of referencing resources: create ResourceURL using renderResponse.createResourceURL() and then you set the resourceID in the ResourceURL. That should give more consistent results across all portlet containers.

That said, if you want to modify the generated content from your usermanual.html but you don't want to convert it to a JSP then, instead of using a request dispatcher, I would load the file contents on my own, parse it at the same time that I do the URL replacements and then print all the contents to the portlet's response.