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Bill,
On 4/22/2010 2:37 AM, Bill Barker wrote:
> If [the request/filter] does a forward or include done the line, this
> won't work with any remotely recent version of Tomcat. These
> versions enforce the spec requirement that the Request has to be a
> subclass of HttpServletWrapper wrapping the original request, or the
> original request.
The following filter works as expected on Tomcat 6.0.26 (some changes
were required to make it actually work... my off-the-cuff implementation
was lacking a few details).
I can confirm that this filter operates properly across a forward()
call: I have a struts action handles by the Struts servlet that forwards
to a Velocity template handled by the Velocity servlet. All calls are
logged to stdout. (Wow, lots of calls to Request.getAttribute!)
import java.io.IOException;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class RequestMethodCallLogger
implements Filter
{
public void doFilter(ServletRequest request,
ServletResponse response,
FilterChain chain)
throws ServletException, IOException
{
if(request instanceof HttpServletRequest)
request = (ServletRequest)Proxy
.newProxyInstance(HttpServletRequest.class.getClassLoader(),
new Class[] {
HttpServletRequest.class },
new Wrapper(request));
chain.doFilter(request, response);
}
public void init(FilterConfig config) { }
public void destroy() { }
static class Wrapper
implements InvocationHandler
{
private Object _target;
Wrapper(Object target)
{
_target = target;
}
public Object invoke(Object proxy, Method method, Object[] args)
throws Throwable
{
System.out.print("Intercepted: ");
System.out.println(method);
return method.invoke(_target, args);
}
}
}
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