借助Ehcache緩存框架實現(xiàn)對頁面的緩存_html/css

package com.ghj.packageoffilter; import java.util.Enumeration;import javax.servlet.FilterChain;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import net.sf.ehcache.constructs.blocking.LockTimeoutException;import net.sf.ehcache.constructs.web.AlreadyCommittedException;import net.sf.ehcache.constructs.web.AlreadyGzippedException;import net.sf.ehcache.constructs.web.filter.FilterNonReentrantException;import net.sf.ehcache.constructs.web.filter.SimplePageCachingFilter;import org.apache.commons.lang.StringUtils;import org.apache.log4j.Logger;/** * 頁面緩存過濾器 * * @author 高煥杰 */public class PageEhCacheFilter extends SimplePageCachingFilter { private final static Logger logger = Logger.getLogger(PageEhCacheFilter.class); private static String[] cacheURLArray; @Override protected void doFilter(final HttpServletRequest request, final HttpServletResponse response, final FilterChain chain) throws AlreadyGzippedException, AlreadyCommittedException, FilterNonReentrantException, LockTimeoutException, Exception { if (cacheURLArray == null) { 	String patterns = filterConfig.getInitParameter("patterns"); 	cacheURLArray = StringUtils.split(patterns, ","); } String requestURL = request.getRequestURL().toString(); boolean containCacheURLFlag = false; if (cacheURLArray != null && cacheURLArray.length > 0) { for (String cacheURL : cacheURLArray) { if (requestURL.contains(cacheURL.trim())) {//判斷當(dāng)前請求是否是要緩存的url 	containCacheURLFlag = true; break; } } } if (containCacheURLFlag) {//當(dāng)前請求是要緩存的url String queryString = request.getQueryString(); if (StringUtils.isNotEmpty(queryString)) {//當(dāng)前請求含有采用問號傳過來的參數(shù) 	queryString = "?" + queryString; 	logger.info("當(dāng)前請求被緩存：" + requestURL + queryString); }else{ 	logger.info("當(dāng)前請求被緩存：" + requestURL); } super.doFilter(request, response, chain); } else {//當(dāng)前請求不是要緩存的url chain.doFilter(request, response); } } /** * 重寫acceptsGzipEncoding方法，使該過濾器兼容對客戶使用IE6和IE7時發(fā)過來請求時的gzip壓縮 * 使用Gzip壓縮時，需注意兩個問題：	 * 1、Filter進行Gzip壓縮時，采用系統(tǒng)默認(rèn)編碼方式，對于使用GBK編碼的中文網(wǎng)頁來說，需要將操作系統(tǒng)的語言設(shè)置為“zh_CN.GBK”，否則會出現(xiàn)亂碼問題。	 * 2、默認(rèn)情況下CachingFilter類（SimplePageCachingFilter類的父類）會根據(jù)瀏覽器發(fā)送的請求頭部所包含的Accept-Encoding參數(shù)值來判斷是否進行Gzip壓縮。雖然瀏覽器IE6和IE7支持Gzip壓縮，但是在發(fā)送請求的時候卻不帶該參數(shù)，因此可以通過繼承CachingFilter類，重寫acceptsGzipEncoding方法來實現(xiàn)。 * * @author 高煥杰 */ @Override protected boolean acceptsGzipEncoding(HttpServletRequest request) { boolean ie6 = headerContains(request, "User-Agent", "MSIE 6.0"); boolean ie7 = headerContains(request, "User-Agent", "MSIE 7.0"); return acceptsEncoding(request, "gzip") || ie6 || ie7; } private boolean headerContains(final HttpServletRequest request, final String header, final String value) { logRequestHeaders(request); final Enumeration accepted = request.getHeaders(header); while (accepted.hasMoreElements()) { final String headerValue = (String) accepted.nextElement(); if (headerValue.indexOf(value) != -1) { return true; } } return false; }}

log4j.rootLogger=DEBUG,Console,DailyRollingFilelog4j.appender.Console=org.apache.log4j.ConsoleAppenderlog4j.appender.Console.layout=org.apache.log4j.PatternLayoutlog4j.appender.Console.layout.ConversionPattern= [%-5p]-[%d{yyyy-MM-dd HH:mm:ss}] -%l -%m%nlog4j.appender.DailyRollingFile=org.apache.log4j.DailyRollingFileAppenderlog4j.appender.DailyRollingFile.Encoding=UTF-8log4j.appender.DailyRollingFile.File=C\:\\framework.loglog4j.appender.DailyRollingFile.DatePattern=yyyy-MM-dd'.log'log4j.appender.DailyRollingFile.layout=org.apache.log4j.PatternLayoutlog4j.appender.DailyRollingFile.layout.ConversionPattern=%d [%t] %-5p %-40.40c %X{traceId}-%m%n

		PageEhCacheFilter	com.ghj.packageoffilter.PageEhCacheFilter		patterns	/index.jsp			cacheName	PageEhCacheFilter				PageEhCacheFilter	*.action			PageEhCacheFilter	*.jsp	

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" import="java.util.Date,java.text.SimpleDateFormat"%>					<%=new SimpleDateFormat("yyyy-MM-dd hh:MM:ss").format(new Date())%>
	每次刷新頁面，如果時間是變動的，則說明該頁面沒有被緩存或緩存已經(jīng)過期，否則則說明該頁面已經(jīng)被緩存。