原文http://anotherbug.blog.chinajavaworld.com/entry/60/0/




1. TimerFilter源碼如下:









package com.chinajavaworld.util;

import java.io.IOException;
import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;

public class TimerFilter
implements Filter
{
public static class Timer
{

long time;

public void start()
{
time = System.currentTimeMillis();
}

public void stop()
{
time = System.currentTimeMillis() - time;
}

public long getTime()
{
return time;
}

public Timer()
{
time = 0L;
}
}


public static final String DEFAULT_TIMER_ATTRIBUTE = "cjw.timer";
private String key;

public TimerFilter()
{
key = null;
}

public void init(FilterConfig filterConfig)
throws ServletException
{
if(filterConfig.getInitParameter("key") != null)
key = filterConfig.getInitParameter("key");
else
key = DEFAULT_TIMER_ATTRIBUTE;
}

public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain)
throws IOException, ServletException
{
HttpServletRequest request = (HttpServletRequest)servletRequest;
Timer timer = new Timer();
timer.start();
request.setAttribute(key, timer);
filterChain.doFilter(servletRequest, servletResponse);
timer.stop();
handleTimer(timer);
}

public void handleTimer(Timer timer1)
{
}

public void destroy()
{
}
}


2. 在web.xml中配置:









<filter>
<filter-name>Timer</filter-name>
<filter-class>com.chinajavaworld.util.TimerFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>Timer</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>


3. 在JSP頁面中寫上代碼:









<%
// Get the timer from the request as an attribute if it exists:
TimerFilter.Timer timer
= (TimerFilter.Timer)request.getAttribute(TimerFilter.DEFAULT_TIMER_ATTRIBUTE);
if (timer != null) {
timer.stop();
%>
<p style="font-size:11px;">Processed in <b><%= timer.getTime() %></b> ms
<%}%>


4. 完成.


 

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