posting again
On Fri, 5 Nov 2004 10:49:25 -0800, Sanjay Choudhary
<[EMAIL PROTECTED]> wrote:
> Hi All,
>
> I have an application which contains 100+ jsp's. Use case is to
> inject the Javascript conditionally into the JSP's. Condition is - If
> a cookie is present in the request, inject the Javascript else leave
> it alone.
>
> I started with a simple struts example project for the proof of
> concept. I thought of a Servlet Filter and I created a filter as
> below
>
> import java.io.IOException;
>
> import javax.servlet.Filter;
> import javax.servlet.FilterChain;
> import javax.servlet.FilterConfig;
> import javax.servlet.RequestDispatcher;
> import javax.servlet.ServletException;
> import javax.servlet.ServletRequest;
> import javax.servlet.ServletResponse;
> import javax.servlet.http.Cookie;
> import javax.servlet.http.HttpServletRequest;
>
> public class SecurePageFilter implements Filter {
> private static final String SECURITY_COOKIE = "ObSSOCookie";
> private static final String SECURITY_JS = "/check.js";
>
> public void init(FilterConfig filterConfig) throws ServletException {
> }
>
> public void destroy() {
> }
>
> public void doFilter(
> ServletRequest oRequest,
> ServletResponse oResponse,
> FilterChain oFilterChain)
> throws IOException, ServletException {
>
> oFilterChain.doFilter(oRequest, oResponse);
>
> HttpServletRequest woRequest = (HttpServletRequest) oRequest;
> Cookie[] aoCookies = woRequest.getCookies();
> String strUrl = woRequest.getRequestURI();
>
> if (strUrl != null
> && strUrl.endsWith("deleteCookie.jsp")
> || aoCookies == null)
> return;
>
> for (int i = 0; i < aoCookies.length; i++) {
> Cookie oCookie = aoCookies[i];
>
> if (oCookie.getName().equals(SECURITY_COOKIE)) {
> String strValue = oCookie.getValue();
> if (strValue != null && strValue.length() > 0) {
> RequestDispatcher rd =
> woRequest.getRequestDispatcher(SECURITY_JS);
> rd.include(oRequest, oResponse);
> oResponse.flushBuffer();
> return;
> }
> }
> }
> return;
> } // doFilter
>
> } // SecurePageFilter
>
> My filter is mapped to (*.jsp and *.do) in the web.xml.
>
> This works fine if I have a URI as
> http://localhost:9080/struts-example/welcome.jsp
>
> But this doesn't work if I use the URL
> http://localhost:9080/struts-example/welcome.do
>
> To explore more I downloaded Struts 1.2 source and took a look in
> RequestDispatcher class --> processForward(..) , processInclude(..),
> doForward(..) and doInclude(..) methods. And off course, process(..)
> method. In the process method , if request is forwarded using the
> RequestDispatcher, which is normally the case in *.do types URI's,
> control is returned back to the servlet without processing the
> 'processInclude'. I further extended the RequestDispatcher class and
> implemented my own doForward method. This is more or less same as
> Struts implementation but also calls includes. Code is as below :-
> protected void doForward(
> String uri,
> HttpServletRequest request,
> HttpServletResponse response)
> throws IOException, ServletException {
>
> // Unwrap the multipart request, if there is one.
> if (request instanceof MultipartRequestWrapper) {
> request = ((MultipartRequestWrapper) request).getRequest();
> }
>
> RequestDispatcher rd = getServletContext().getRequestDispatcher(uri);
> if (rd == null) {
> response.sendError(
> HttpServletResponse.SC_INTERNAL_SERVER_ERROR,
> getInternal().getMessage("requestDispatcher", uri));
> return;
> }
> rd.forward(request, response);
> doIncludeJS(request,response);
> }
>
> protected void doIncludeJS(
> HttpServletRequest request,
> HttpServletResponse response)
> throws IOException, ServletException {
> Cookie[] aoCookies = request.getCookies();
> String strUrl = request.getRequestURI();
>
> if (strUrl != null
> && strUrl.endsWith("deleteCookie.jsp")
> || aoCookies == null)
> return;
>
> for (int i = 0; i < aoCookies.length; i++) {
> Cookie oCookie = aoCookies[i];
>
> if (oCookie.getName().equals(SECURITY_COOKIE)) {
> String strValue = oCookie.getValue();
> if (strValue != null && strValue.length() > 0) {
> doInclude(SECURITY_JS,request, response);
> break;
> }
> }
> }
> return;
> }
>
> Still to my surprise, JS file did not get injected in the response.( I
> debugged the application do ensure that doInclude(..) method is
> called)
>
> [Q1] - Can we use RequestDispatcher to Forward and Include for the
> same request/response? (I know we can't do Include and Forward, it
> throws an error. But in case of Forward and Include no error is thrown
> but nothing gets included).
>
> [Q2] - Is there anyother way of including into request with URI like *.do?
>
> Any help is highly appreciated.
>
> Thanks,
>
> Sanjay
>
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