ehcache配置拦截器缓存页面

配置SimplePageCachingFilter

最新推荐文章于 2022-05-04 13:32:05 发布

原创最新推荐文章于 2022-05-04 13:32:05 发布 · 203 阅读

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#JavaEE #Java #JSP #Cache #CSS

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本文介绍了如何在web应用中配置SimplePageCachingFilter来缓存特定页面，并详细展示了配置文件web.xml和ehcache.xml的具体内容，同时给出了index.jsp页面的示例代码。

配置一个filter

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" 
	xmlns="http://java.sun.com/xml/ns/javaee" 
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
	http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
	
	<filter>
	    <filter-name>SimplePageCachingFilter</filter-name>
	    <filter-class>net.sf.ehcache.constructs.web.filter.SimplePageCachingFilter</filter-class>
	</filter>
	<filter-mapping>
	    <filter-name>SimplePageCachingFilter</filter-name>
	    <url-pattern>/index.jsp</url-pattern>
	</filter-mapping>
  
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
</web-app>

配置ehcache.xml cache的name必须为SimplePageCachingFilter，不然会报拦截器加载失败及空指针

<ehcache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:noNamespaceSchemaLocation="../../main/config/ehcache.xsd">

    <diskStore path="java.io.tmpdir"/>

    <defaultCache
            maxElementsInMemory="10"
            eternal="false"
            timeToIdleSeconds="5"
            timeToLiveSeconds="10"
            overflowToDisk="true"
            />

   <cache 
   		name="SimplePageCachingFilter" 
   		maxElementsInMemory="10000" 
   		eternal="false"
        overflowToDisk="false" 
        timeToLiveSeconds="2"	
        memoryStoreEvictionPolicy="LFU" 
    />
    <!-- timeToLiveSeconds两秒 -->
</ehcache>

<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>My JSP 'index.jsp' starting page</title>
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
	<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->
  </head>
  
  <body>
    <%
		out.println(new Date());
	%>
  </body>
</html>

必须有common-logging.jar和log4j.jar

下面是完整代码