The code for the Filter implementation:
public class SimpleFilter implements Filter {
public void destroy() {
}
public void doFilter(ServletRequest servletRequest, ServletResponse
servletResponse,
FilterChain filterChain) throws IOException, ServletException {
if(servletRequest instanceof HttpServletRequest) {
HttpServletRequest httpServletRequest =
(HttpServletRequest)servletRequest;
FakeHeadersRequest request = new
FakeHeadersRequest(httpServletRequest);
filterChain.doFilter(request, servletResponse);
} else {
filterChain.doFilter(servletRequest, servletResponse);
}
return;
}
public void init(FilterConfig filterConfig) throws ServletException {
}
}
The code for the Valve subclass:
public class ModifyHeaderValve extends ValveBase {
public void invoke(Request request, Response response, ValveContext
valveContext)
throws IOException, ServletException {
if(
!(request instanceof HttpRequest) ||
!(response instanceof HttpResponse)
) {
valveContext.invokeNext(request, response);
return;
}
if(
!(request.getRequest() instanceof HttpServletRequest) ||
!(response.getResponse() instanceof HttpServletResponse)
) {
valveContext.invokeNext(request, response);
return;
}
HttpServletRequest httpServletRequest = (HttpServletRequest)request;
FakeHeadersRequest fakeHeadersRequest = new
FakeHeadersRequest(httpServletRequest);
String value = fakeHeadersRequest.getHeader("username");
valveContext.invokeNext(request, response);
return;
}
}
The code for the FakeHeadersRequest:
public class FakeHeadersRequest extends HttpServletRequestWrapper {
public FakeHeadersRequest(HttpServletRequest request) {
super(request);
}
public String getHeader(String name) {
HttpServletRequest request = (HttpServletRequest)getRequest();
if("username".equals(name)) {
Cookie[] cookies = request.getCookies();
for(int i=0; i < cookies.length; i++) {
if("username".equals(cookies[i].getName())) {
String val = cookies[i].getValue();
return val;
}
}
}
return request.getHeader(name);
}
public Enumeration getHeaderNames() {
List list = new ArrayList();
HttpServletRequest request = (HttpServletRequest)getRequest();
Enumeration e = request.getHeaderNames();
while(e.hasMoreElements()) {
String n = (String)e.nextElement();
list.add(n);
}
list.add("username");
Enumeration en = Collections.enumeration(list);
return en;
}
}
On Thu, Feb 12, 2009 at 3:05 AM, Kees de Kooter wrote:
> Could you post the code of your valve and your filter?
>
> Please also not that a Valve is a tomcat specific thing i.e. not
> portable to other app servers. A Filter is part of the servlet spec
> and portable.
>
>
> On Thu, Feb 12, 2009 at 06:13, Jake Vang wrote:
> > I've been looking for a way to modify my request header. I found that
> > implementing javax.servlet.Filter is the way to go. However, I noticed
> that
> > once after I got my Filter implementation working, my Valve is no longer
> > reached (I created my own Valve subclassing
> > org.apache.catalina.valves.ValveBase). I've determined this because I've
> > placed breakpoints in the Filter.doFilter(...) method and
> Valve.invoke(...)
> > methods, and only the breakpoint in the Filter class implementation is
> > caught.
> >
> > My context XML for my web application is:
> >
> >
> > >docBase="C:\my-valve\dist"
> >reloadable="true">
> >
> >
> >
> > My web.xml for my web application is:
> >
> >
> >simpleFilter
> >vang.jake.servlet.filter.SimpleFilter
> >
> >
> >simpleFilter
> >/*
> >
> >
> > Could someone clarify if the use of one (filter) precludes the use of the
> > other (valve)? If so, why? If not, why is my valve never reached?
> >
> > Thanks.
> >
>
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>
