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关于改造动态网站为生成静态页的方案

 

 

url 重写的好处 :

一， 可以方便的实现对化化引擎的优化，并且比生成静态 更加方便。

二， 占空间比较小。

三， 首页每天都自动变化，不用维护。

1. 通过urlrewrite 进行静态页生成及缓存. http://tuckey.org/urlrewrite/ 下载.2. 添加urlrewrite.xml配置文件到webroot/WEB-INF/下;添加urlrewrite-XXX.jar到webroot/WEB-INF/lib下;3. 修改urlrewrite.xml为<?xml version="1.0" encoding="utf-8"?><!DOCTYPE urlrewrite PUBLIC "-//tuckey.org//DTD UrlRewrite 2.6//EN"        "http://tuckey.org/res/dtds/urlrewrite2.6.dtd"><urlrewrite>    <rule>        <from>^/index.html$</from>        <to>/index.jsp</to>    </rule>        <rule>        <from>^/product/detail-([0-9]+)/.html$</from>        <to>/controler/PageControler?param=chan1=$1&page=productDetail.do</to>    </rule><rule>        <from>^/catalog/list-p-([0-9]+)-([0-9]+)/.html$</from>        <to>/controler/PageControler?param=cataId=$1_cur=$2&page=productCatalogList.do</to>    </rule>    <outbound-rule>        <from>/index.jsp</from>        <to>index.html</to>    </outbound-rule></urlrewrite>关于urlrewrite的配置参见urlrewrite相关doc.4. 新建过滤器HtmlCatchFilter用来检查静态页import java.io.File;import java.io.IOException;import java.util.Date;import javax.servlet.Filter;import javax.servlet.FilterChain;import javax.servlet.FilterConfig;import javax.servlet.ServletException;import javax.servlet.ServletRequest;import javax.servlet.ServletResponse;public class HtmlCatchFilter implements Filter { // 定义公用变量public final static String staticRootUrl = "/WEB-INF/staticdoc/";public final static String webroot = "D:/webroot";public final static long overtime = 1000 * 60;// 一分钟为过期时间public void destroy() { System.out.println(getClass().getName() + "  destroy!");}public void doFilter(ServletRequest request, ServletResponse response,FilterChain chain) throws IOException, ServletException { System.out.println(getClass().getName() + " doFilter!");String param = request.getParameter("param");System.out.println("参数集合:" + param);String page = request.getParameter("page");String newUrl = page + "_" + param + ".html";File file = new File(webroot + staticRootUrl + newUrl);if (file.exists()) { System.out.print("文件最后修改时间:");System.out.println(new Date(file.lastModified()));long lastModified = file.lastModified();long currently = System.currentTimeMillis();System.out.println(new Date(currently));System.out.println("lastModified:" + lastModified + "|currently:"+ currently + "|时间差:" + (currently - lastModified));if (currently - lastModified > overtime) { System.out.println("静态文件" + newUrl+ "过期!转到PageControlerServlet进行生成");chain.doFilter(request, response);}System.out.println("静态文件存在,并且是可用的,转到静态文件" + staticRootUrl + newUrl);request.getRequestDispatcher(staticRootUrl + newUrl).forward(request, response);} else { System.out.println("静态文件" + newUrl+ "不存在!转到PageControlerServlet进行生成");chain.doFilter(request, response);}}public void init(FilterConfig arg0) throws ServletException { System.out.println(getClass().getName() + " init!");}}5. 新建servlet,用来生成静态页.PageControlerServlet.javaimport java.io.BufferedWriter;import java.io.FileOutputStream;import java.io.IOException;import java.io.OutputStreamWriter;import java.io.Writer;import javax.servlet.Servlet;import javax.servlet.ServletConfig;import javax.servlet.ServletException;import javax.servlet.ServletRequest;import javax.servlet.ServletResponse;public class PageControlerServlet implements Servlet { public void destroy() { System.out.println(getClass().getName() + " destroy");}public ServletConfig getServletConfig() { System.out.println(getClass().getName() + " getServletConfig");return null;}public String getServletInfo() { System.out.println(getClass().getName() + " getServletInfo");return null;}public void init(ServletConfig arg0) throws ServletException { System.out.println(getClass().getName() + " init");}public void service(ServletRequest request, ServletResponse response)throws ServletException, IOException { System.out.println(getClass().getName() + " service");System.out.println("param="+request.getParameter("param"));//通过此servlet来进行静态文件的生成和有效性检查.System.out.println("=======进行生成静态文件处理,生成结束并转到静态页");String param = request.getParameter("param");System.out.println("参数集合:" + param);String page = request.getParameter("page");String newUrl =  page +"_"+param+".html";String newFileName = HtmlCatchFilter.webroot+HtmlCatchFilter.staticRootUrl+newUrl;String str = "生成的新的静太文件内容";String params = param.replace('_', '&');System.out.println("请求动态参数:"+params);str = str + "请求:"+page+"?"+params+"取得页面内容";FileOutputStream fos = new FileOutputStream(newFileName);Writer out = new OutputStreamWriter(fos, "UTF-8");BufferedWriter bw = new BufferedWriter(out);// 将字符串写入文件bw.write(str);bw.flush();// 将数据更新至文件fos.close();// 关闭文件流System.out.println("生成新的文件结束,并转向静态文件!");request.getRequestDispatcher(HtmlCatchFilter.staticRootUrl+newUrl).forward(request, response);}}6. 配置web.xml<?xml version="1.0" encoding="UTF-8"?><web-app>    <!-- UrlRewriteFilter config start -->  <filter>                                            <filter-name>UrlRewriteFilter</filter-name>     <filter-class>org.tuckey.web.filters.urlrewrite.UrlRewriteFilter</filter-class>  </filter>                 <filter-mapping>             <filter-name>UrlRewriteFilter</filter-name>                                   <url-pattern>*.html</url-pattern>                             </filter-mapping>   <!-- UrlRewriteFilter config end -->         <!-- HtmlCacheFilter config start -->  <filter>    <filter-name>HtmlCacheFilter</filter-name>    <filter-class>HtmlCatchFilter</filter-class>         </filter>  <filter-mapping>        <filter-name>HtmlCacheFilter</filter-name>           <url-pattern>/controler/*</url-pattern>                                <dispatcher>FORWARD</dispatcher>                                </filter-mapping><!-- HtmlCacheFilter config end -->  <servlet>    <servlet-name>PageControlerServlet</servlet-name>    <servlet-class>PageControlerServlet</servlet-class>  </servlet>  <servlet-mapping>    <servlet-name>PageControlerServlet</servlet-name>    <url-pattern>/controler/PageControler</url-pattern>  </servlet-mapping></web-app>  7. 测试;访问http://localhost/catalog/list-p-1-2.html  在/WEB-INF/staticdoc/目录下生成productCatalogList.do_cataId=1_cur=2.html 静态文件,扩展上边demo可以改造成生成目录和文件过期时间可配的.来实现改造现有网站的静态化方案.

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