JSP/HTML页面（公共JS、CSS、Image缓存）-----静态缓存

来源：互联网发布：dvd光盘刻录软件编辑：程序博客网时间：2024/05/18 01:54

【1】服务端配置一个Filter，实现对js、css和image的缓存

package com.cache.model.filter;import java.io.IOException;import java.util.Enumeration;import javax.servlet.Filter;import javax.servlet.FilterChain;import javax.servlet.FilterConfig;import javax.servlet.ServletException;import javax.servlet.ServletRequest;import javax.servlet.ServletResponse;import javax.servlet.http.HttpServletResponse;public class CacheFilter implements Filter {private FilterConfig fc;  @Overridepublic void destroy() {// TODO Auto-generated method stubthis.fc = null;}@Overridepublic void doFilter(ServletRequest req, ServletResponse res, FilterChain chain)throws IOException, ServletException {// TODO Auto-generated method stubHttpServletResponse response = (HttpServletResponse) res;  for (Enumeration e = fc.getInitParameterNames(); e.hasMoreElements();) {              String headerName = (String) e.nextElement();              response.addHeader(headerName, fc.getInitParameter(headerName));          }          chain.doFilter(req, response);  }@Overridepublic void init(FilterConfig filterConfig) throws ServletException {// TODO Auto-generated method stub this.fc = filterConfig;  }}

web.xml配置

<?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>CacheFilter</filter-name>          <filter-class>com.cache.model.filter.CacheFilter</filter-class>          <init-param>              <param-name>Cache-Control</param-name>              <param-value>max-age=604800, public</param-value>          </init-param>      </filter>     <filter-mapping>          <filter-name>CacheFilter</filter-name>          <url-pattern>/js/*</url-pattern>      </filter-mapping>      <filter-mapping>          <filter-name>CacheFilter</filter-name>          <url-pattern>/images/*</url-pattern>      </filter-mapping>      <filter-mapping>          <filter-name>CacheFilter</filter-name>          <url-pattern>/css/*</url-pattern>      </filter-mapping>   </web-app>

完成这一步，在服务端已经实现了对页面公共资源的缓存，但是当前情况下页面还是会每次访问服务器的，只是压力减小了。

如何让页面公共资源在用户第一次加载后，就不需要服务器二次加载？

实现方式是对应公用的JS都放到一个页面中，别的页面包含他，在这个页面中增加页面缓存（特定静态资源）

<%@ page language="java" pageEncoding="utf-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><meta charset="utf-8" /><meta http-equiv="cache-control" content="max-age=604800, public"/><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><!--IE10--><meta http-equiv="X-UA-Compatible" content="IE=EmulateIE8" /><!--<meta name=”renderer” content=”webkit|ie-comp|ie-stand”>--><meta name=”renderer” content=”webkit|ie-comp|ie-stand” /><!-- CSS styles --><link rel="stylesheet" type="text/css" href="<%=basePath%>commons/css/bootstrap.min.css" /><script src="<%=basePath%>commons/js/jquery-1.4.2.min.js" charset="utf-8"></script>

页面应用：

<%@ page language="java" pageEncoding="utf-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head> <jsp:include page="index.jsp" flush="true"/><!--动态包含-->  <title>页面缓存</title></head><body></body></html>

google 浏览器分析：

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JSP/HTML页面 （公共JS、CSS、Image缓存）-----静态缓存

JSP/HTML页面（公共JS、CSS、Image缓存）-----静态缓存