Re: Using a StaticFilter and dispatching to FacesServlet doesn't work

In my web application, I prefer to have FacesServlet mapped to *.html.  This

has worked fine for me for the last couple of years. Recently, I've tried to

add a StaticFilter that looks for static files (i.e. /content/faq.html) and

dispatches to those if they're found. If they're not found, I dispatch to

the FacesServlet, which doesn't have a <servlet-mapping> in web.xml.  This

all works great, except that <h:commandLink> seems to need the servlet

mapping in order to create its links.  If I have the following in my

web.xml:

    <!-- No servlet-mapping - StaticFilter handles forwarding to "faces"

servlet when no static files found -->

    <!--servlet-mapping>

        <servlet-name>faces</servlet-name>

        <url-pattern>*.html</url-pattern>

    </servlet-mapping-->

    <servlet-mapping>

        <servlet-name>dwr-invoker</servlet-name>

        <url-pattern>/dwr/*</url-pattern>

    </servlet-mapping>

Links are rendered as /dwr/foo.xhtml instead of /foo.html.  Is this a known

issue?  Is there a better way to do what I'm trying to do (without using a

different extension)?

Thanks,

Matt

package org.appfuse.webapp.filter;

import org.apache.commons.lang.StringUtils;

import org.springframework.util.PatternMatchUtils;

import org.springframework.web.filter.OncePerRequestFilter;

import org.springframework.web.util.UrlPathHelper;

import javax.servlet.FilterChain;

import javax.servlet.RequestDispatcher;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import java.io.IOException;

import java.util.Iterator;

import java.util.Set;

/**

 * A simple filter that allows the application to continue using the .html

prefix for actions but also allows

 * static files to be served up with the same extension. Dojo to serve up

its HTML template code. The filter works

 * on an include/exclude basis where all requests for active pages are

redirected by the filter to thee dispatch

 * servlet. All Dojo related .html requests are allowed to pass straight

through to be processed by the servlet

 * container as per normal.

 */

public class StaticFilter extends OncePerRequestFilter {

    private final static String DEFAULT_INCLUDES = "*.html";

    private final static String DEFAULT_EXCLUDES = "";

    private static final String INCLUDES_PARAMETER = "includes";

    private static final String EXCLUDES_PARAMETER = "excludes";

    private static final String SERVLETNAME_PARAMETER = "servletName";

    private String[] excludes;

    private String[] includes;

    private String servletName = null;

    /**

     * Read the includes/excludes paramters and set the filter accordingly.

     */

    public void initFilterBean() {

        String includesParam =

getFilterConfig().getInitParameter(INCLUDES_PARAMETER);

        if (StringUtils.isEmpty(includesParam)) {

            includes = parsePatterns(DEFAULT_INCLUDES);

        } else {

            includes = parsePatterns(includesParam);

        }

        String excludesParam =

getFilterConfig().getInitParameter(EXCLUDES_PARAMETER);

        if (StringUtils.isEmpty(excludesParam)) {

            excludes = parsePatterns(DEFAULT_EXCLUDES);

        } else {

            excludes = parsePatterns(excludesParam);

        }

        // if servletName is specified, set it

        servletName =

getFilterConfig().getInitParameter(SERVLETNAME_PARAMETER);

    }

    private String[] parsePatterns(String delimitedPatterns) {

        //make sure no patterns are repeated.

        Set patternSet =

org.springframework.util.StringUtils.commaDelimitedListToSet(delimitedPatterns);

        String[] patterns = new String[patternSet.size()];

        int i = 0;

        for (Iterator iterator = patternSet.iterator(); iterator.hasNext();

i++) {

            //no trailing/leading white space.

            String pattern = (String) iterator.next();

            patterns[i] = pattern.trim();

        }

        return patterns;

    }

    /**

     * This method checks to see if the current path matches includes or

excludes. If it matches includes and

     * not excludes, it forwards to the static resource and ends the filter

chain. Otherwise, it forwards to the

     * next filter in the chain.

     *

     * @param request the current request

     * @param response the current response

     * @param chain the filter chain

     * @throws IOException

     * @throws ServletException

     */

    public void doFilterInternal(HttpServletRequest request,

HttpServletResponse response,

                                 FilterChain chain) throws IOException,

ServletException {

        UrlPathHelper urlPathHelper = new UrlPathHelper();

        String path = urlPathHelper.getPathWithinApplication(request);

        boolean pathExcluded = PatternMatchUtils.simpleMatch(excludes,

path);

        boolean pathIncluded = PatternMatchUtils.simpleMatch(includes,

path);

        if (pathIncluded && !pathExcluded) {

            if (logger.isDebugEnabled()) {

                logger.debug("Forwarding to static resource: " + path);

            }

            RequestDispatcher rd =

getServletContext().getRequestDispatcher(path);

            rd.forward(request, response);

            return;

        }

        if (servletName != null) {

            RequestDispatcher rd =

getServletContext().getNamedDispatcher(servletName);

            rd.forward(request, response);

            return;

        }

        chain.doFilter(request, response);

    }

}

-- 

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