Re: URL redirect problem, even with 'RequestDispatcher' servlet !

[Tim Funk]

/ is also known as the default servlet. So your servlet will also need to 
server all static content too.

-Tim

Hertenstein Alain wrote:

Hi all,
 
This question has already been asked before, but the solutions found in
the archives don't seem to work properly.
 
I have a web site running on IIS and Tomcat 4.1.24 under the root
context, let's say http://www.mysite.com
When people access the URL, it automatically redirects to the context's
default page "index.html", making the http://www.mysite.com/index.html
URL to appear in the browser. I'd like to avoid this and only have
http://www.mysite.com in the location bar instead. BUT I only want this
behaviour for the default page only, NOT for other pages (f.ex.
http://www.mysite.com/info/home.htm should remain unchanged in the
location bar).
 
In the Tomcat list archives, some people mentioned about writing a
servlet which would forward the request to the appropriate page. Here's
what I've done :
 
1) I've added added this in the web.xml :
 
<servlet>
    <servlet-name>indexredirect</servlet-name>
    <servlet-class>test.servlets.IndexRedirect</servlet-class>
</servlet>
<servlet-mapping>
    <servlet-name>indexredirect</servlet-name>
    <url-pattern>/</url-pattern>
</servlet-mapping>
 
2) I've created the IndexRedirect servlet and added it in the
WEB-INF/classes/etc... directory, whose doGet() method looks like this :
 
  public void doGet(HttpServletRequest request, HttpServletResponse
response) throws ServletException, IOException {
    response.setContentType(CONTENT_TYPE);

    String requestUri = request.getRequestURI(),
        contextPath = request.getContextPath(),
        requestedPage = "";
 
    requestedPage = requestUri.replaceFirst(contextPath, ""); //
request.getServletPath() seems to do it too, but doesn't always work ?
    System.out.println("requestedPage : "+requestedPage);

    if (requestedPage.equals("/")) {
        System.out.println("DEFAULT Forwarding request to index.html
!");
        RequestDispatcher reqDispatcher =
request.getRequestDispatcher(response.encodeURL("index.html"));
        reqDispatcher.forward(request, response);
    }
// Commented out because redirecting to the requested page starts an
infinite loop !!!
/* else {
        System.out.println("Forward request to "+requestedPage+"...");
        RequestDispatcher reqDispatcher =
request.getRequestDispatcher(response.encodeURL(requestedPage));
        reqDispatcher.forward(request, response);
    }*/
}
After testing the http://www.mysite.com/ URL, the page redirects to
index.html the first time, which is fine. But then, I don't know why but
the servlet is called again, detects that the requested URL is
http://www.mysite.com/index.html now, and would go to the "else"
statement (here commented out), and thus forward the request to
index.html again !! Infinite loop...
 
My questions are :
- I don't understand why the servlet is called whenever the request URI
is, although the <url-pattern> tag in web.xml is defined as "/" (so the
servlet should only be called when the context's root page is requested,
i.e. http://www.mysite.com/ ?).
- How can I have this thing done ? Is there something I've forgotten
here ?
 
Thanks a lot for your help, this problem is really puzzling me...
 
Note : I'm not using Apache, so mod_rewrite is not an option for me.
 
Best regards
Alain Hertenstein


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