reportfilter.java

J2EE指南

import java.io.*; 
import javax.servlet.*; 
import javax.servlet.http.*; 
import java.util.*; 

/** Simple filter that prints a report on the standard output 
* whenever the associated servlet or JSP page is accessed. 
* <P> 
* Taken from More Servlets and JavaServer Pages 
* from Prentice Hall and Sun Microsystems Press, 
* http://www.moreservlets.com/. 
* ? 2002 Marty Hall; may be freely used or adapted. 
*/ 

public class ReportFilter implements Filter { 
public void doFilter(ServletRequest request, 
ServletResponse response, 
FilterChain chain) 
throws ServletException, IOException { 
HttpServletRequest req = (HttpServletRequest)request; 
System.out.println(req.getRemoteHost() + 
" tried to access " + 
req.getRequestURL() + 
" on " + new Date() + "."); 
chain.doFilter(request,response); 
} 

public void init(FilterConfig config) 
throws ServletException { 
} 

public void destroy() {} 
}