JSP中计算页面执行（处理）时间
//在CJWBlog的用户日志首页最下方，会显示页面执行时间 Processed in 4 ms ，实现如下： //1. TimerFilter源码如下： 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页面中写上代码： <% // 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. 1 楼 chan.d 2010-11-25 思路不错，还可以再设计一点，做成Tag。