使用Filter记录日志、来访IP、URL和页面执行时间

import Java.io.*;

import javax.servlet.*;

import javax.servlet.http.*;

public final class LoggingFilter implements Filter

{

private FilterConfig filterConfig = null;

public void doFilter(ServletRequest request, ServletResponse response,

FilterChain chain)

throws IOException, ServletException

{

long start = System.currentTimeMillis();

String address = request.getRemoteAddr();

String file = ((HttpServletRequest) request).getRequestURI();

chain.doFilter(request, response);

filterConfig.getServletContext().log(

"User Access! " +

" User IP: " + address +

" Resource: " + file +

" Milliseconds used: " + (System.currentTimeMillis() - start)

);

}

public void destroy() { }

public void init(FilterConfig filterConfig) {

this.filterConfig = filterConfig;

}

}

（出处：http://www.knowsky.com）