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HTML页面实现全方位页面缓存

2024-07-22 21:03:25   222人阅读

【1】服务端配置一个Filter，实现对js、css和image的缓存

package cn.com.system.filter;

import java.io.IOException;
import java.util.Enumeration;

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 CacheForWeekFilter {

	private FilterConfig fc;

	public void doFilter(ServletRequest req, ServletResponse res,
			FilterChain chain) throws IOException, ServletException {
		HttpServletResponse 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);
	}

	public void init(FilterConfig filterConfig) {
		this.fc = filterConfig;
	}

	public void destroy() {
		this.fc = null;
	}
}

web.xml配置

<filter>  
        <filter-name>CacheForWeek</filter-name>  
        <filter-class>cn.com.system.filter.CacheForWeekFilter</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>CacheForWeek</filter-name>  
        <url-pattern>/js/</url-pattern>  
    </filter-mapping>  
    <filter-mapping>  
        <filter-name>CacheForWeek</filter-name>  
        <url-pattern>/images/</url-pattern>  
    </filter-mapping>  
    <filter-mapping>  
        <filter-name>CacheForWeek</filter-name>  
        <url-pattern>/css/</url-pattern>  
    </filter-mapping>
完成这一步，在服务端已经实现了对页面的缓存，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

如何让页面在一段时间内不访问服务器呢

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

<%@ page language="java" pageEncoding="UTF-8"%>
<meta charset="utf-8" />
<span style="color:#ff0000;"><meta http-equiv="cache-control" content="max-age=604800, public"></span>

<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=http://www.mamicode.com/"${pageContext.request.contextPath}/css/base.css" />>


HTML页面实现全方位页面缓存


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