freemmarker enable JSPSupportServlet - kendo-ui

Question

My question is very simple. I want to use another taglib with freemarker.
I read in the freemarker doc that it's possible.
I want to use the kendoui taglib
<%#taglib prefix="kendo" uri="http://www.kendoui.com/jsp/tags"%>
the api doc says we must do that by adding a line like
<#assign html=JspTaglibs["/WEB-INF/struts-html.tld"]>.
But when i do that, i have the error
The following has evaluated to null or missing: ==> JspTaglibs
cordially.
thankyou for your answerd. it works thine when i use freemarkerServlet.
But i want to use a single servlet that will allow me to configure freemarker (in init method) and parse the html response to response writer.
req.setCharacterEncoding(cfg.getOutputEncoding());
resp.setContentType("text/html; charset=" + cfg.getOutputEncoding());
resp.setHeader("Cache-Control", "no-store, no-cache, must-revalidate, post-check=0, pre-check=0");
resp.setHeader("Pragma", "no-cache");
resp.setHeader("Expires", "Thu, 01 Dec 1994 00:00:00 GMT");
Writer out = resp.getWriter();
template.process(page.getRoot(), out);
in fact, i want to extend freemarkerServlet class as mentionned here : http://schakrap.wordpress.com/2009/09/05/using-freemarkerservlet-in-google-guice-to-inject-configuration/ .
But i still have the same error.
for the matter what does mean the config parameter TemplatePath ?

Answer 1

The JspTaglibs variable, and the whole environment that's needed for custom JSP tags to feel home, is set up by the freemarker.ext.servlet.FreemarkerServlet. So currently the only way to use taglibs is with FreemarkerServlet, which was made so that you can use FTL files instead of JSP files in legacy JSP Model-2 frameworks.

Answer 2

package presentation;
import java.io.IOException;
import java.io.StringReader;
import java.io.Writer;
import java.text.DateFormat;
import java.util.Locale;
import java.util.Map;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import freemarker.core.Macro;
import freemarker.template.Configuration;
import freemarker.template.ObjectWrapper;
import freemarker.template.Template;
import freemarker.template.TemplateExceptionHandler;
public class ControllerServlet extends freemarker.ext.servlet.FreemarkerServlet
{
//
private Configuration cfg;
private Handler handler;
public ControllerServlet()
{
super();
}
public void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException
{
String userAgentString = "";
StringBuffer url = req.getRequestURL();
String sUrl = url.toString();
// on instancie les classes/structures pour Freemarker
FreemarkerParameterMap page = new FreemarkerParameterMap();
handler = new Handler();
try
{
userAgentString = req.getHeader("User-Agent");
System.out.println("User-Agent : " + userAgentString);
handler.handle(req, resp, page);
if (page.getDataType() == FreemarkerParameterMap.AJAX_JSON)
{
Gson gson = new GsonBuilder().setDateFormat(DateFormat.FULL).setPrettyPrinting().create();
Map<String, Object> map = page.getRoot();
resp.setContentType("application/json;charset=UTF-8");
resp.getWriter().println(gson.toJson(map));
resp.getWriter().flush();
}
else if (page.getDataType() == FreemarkerParameterMap.HTML_REDIRECT && page.getRedirect() != null)
{
resp.sendRedirect(page.getRedirect());
}
else if (page.getDataType() == FreemarkerParameterMap.HTML_FORWARD && page.getForward() != null)
{
RequestDispatcher rd = req.getRequestDispatcher(page.getForward());
rd.forward(req, resp);
}
else
{
if (page.getTemplate() != null)
{
Template t = cfg.getTemplate("theme/" + page.getTemplate());
if (page.getDataType() == FreemarkerParameterMap.AJAX_HTML)
{
Map mapMacro = t.getMacros();
Macro macro = (Macro) mapMacro.get(page.getMacro());
t = new Template("name", new StringReader(macro.getSource()+"<#"+page.getMacro()+"/>"), cfg);
}
else if (page.getDataType() == FreemarkerParameterMap.HTML)
{
}
req.setCharacterEncoding(cfg.getOutputEncoding());
resp.setContentType("text/html; charset=" + cfg.getOutputEncoding());
resp.setHeader("Cache-Control", "no-store, no-cache, must-revalidate, post-check=0, pre-check=0");
resp.setHeader("Pragma", "no-cache");
resp.setHeader("Expires", "Thu, 01 Dec 1994 00:00:00 GMT");
Writer out = resp.getWriter();
t.process(page.getRoot(), out);
}
else
{
throw new ServletException("aucune action specifiée");
}
}
}
/*catch (EcoliaException e)
{
} */
catch (Exception e)
{
e.printStackTrace();
}
}
/**
* The doPost method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to post.
*
* #param request the request send by the client to the server
* #param response the response send by the server to the client
* #throws ServletException if an error occurred
* #throws IOException if an error occurred
*/
public void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException
{
doGet(req, resp);
}
/**
* Initialization of the servlet. <br>
*
* #throws ServletException if an error occurs
*/
public void init() throws ServletException
{
// Initialize the FreeMarker configuration;
// - Create a configuration instance
cfg = new Configuration();
// - Templates are stored in the WEB-INF/templates directory of the Web app.
cfg.setServletContextForTemplateLoading(getServletContext(), "");
// - Set update dealy to 0 for now, to ease debugging and testing.
// Higher value should be used in production environment.
cfg.setTemplateUpdateDelay(0);
// - Set an error handler that prints errors so they are readable with
// a HTML browser.
cfg.setTemplateExceptionHandler(TemplateExceptionHandler.HTML_DEBUG_HANDLER);
// - Use beans wrapper (recommmended for most applications)
cfg.setObjectWrapper(ObjectWrapper.BEANS_WRAPPER);
// - Set the default charset of the template files
cfg.setDefaultEncoding("UTF-8");
// - Set the charset of the output. This is actually just a hint, that
// templates may require for URL encoding and for generating META element
// that uses http-equiv="Content-type".
cfg.setOutputEncoding("UTF-8");
// - Set the default locale
cfg.setLocale(Locale.US);
System.out.println("init controleur");
}
}
and in the web.xml i have this :
<servlet>
<description>This is the description of my J2EE component</description>
<display-name>This is the display name of my J2EE component</display-name>
<servlet-name>ControllerServlet</servlet-name>
<servlet-class>presentation.ControllerServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>ControllerServlet</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>