In order to forward /[number]/index.xhtml to /index.xhtml whereby [number] is been stored as a request attribute, you need a servlet filter. The doFilter() implementation can look like this:
@WebFilter("/*")
public class YourFilter implements Filter {
@Override
public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {
HttpServletRequest request = (HttpServletRequest) req;
String[] paths = request.getRequestURI().substring(request.getContextPath().length()).split("/");
if (paths.length == 3 && paths[2].equals("index.xhtml") && paths[1].matches("[0-9]{1,9}")) {
request.setAttribute("directory", Integer.valueOf(paths[1]));
request.getRequestDispatcher("/index.xhtml").forward(req, res);
}
else {
chain.doFilter(req, res);
}
}
// ...
}
It makes sure the number matches 1 to 9 latin digits and stores it as a request attribute identified by directory and finally forwards to /index.xhtml in context root. If nothing maches, it simply continues the request as if nothing special happened.
In the /index.xhtml you can access the number by #{directory}.
<p>You accessed through "#{directory}"</p>
Then, in order to make sure JSF navigation (and <h:form>!) keeps working, you need a custom view handler which overrides the getActionURL() to prepend the URL with the path represented by directory request attribute, if any. Here's a kickoff example:
public class YourViewHandler extends ViewHandlerWrapper {
private ViewHandler wrapped;
public YourViewHandler(ViewHandler wrapped) {
this.wrapped = wrapped;
}
@Override
public String getActionURL(FacesContext context, String viewId) {
String actionURL = super.getActionURL(context, viewId);
if (actionURL.endsWith("/index.xhtml")) {
Integer directory = (Integer) context.getExternalContext().getRequestMap().get("directory");
if (directory != null) {
actionURL = actionURL.substring(0, actionURL.length() - 11) + directory + "/index.xhtml";
}
}
return actionURL;
}
@Override
public ViewHandler getWrapped() {
return wrapped;
}
}
In order to get it to run, register in faces-config.xml as below.
<application>
<view-handler>com.example.YourViewHandler</view-handler>
</application>
This is also pretty much how JSF targeted URL rewrite engines such as PrettyFaces work.
See also:
