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JSP/HTML页面（公共JS、CSS、Image缓存）-----静态缓存

2016-11-25 10:42 537 查看

【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;

@Override
public void destroy() {
// TODO Auto-generated method stub
this.fc = null;
}

@Override
public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain)
throws IOException, ServletException {
// TODO Auto-generated method stub
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);
}

@Override
public 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>

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章节导航

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