Spring MVC + freemarker实现半自动静态化

这里对freemarker的代码进行了修改，效果:
1,请求.do的URL时直接生成对应的.htm文件,并将请求转发到该htm文件
2,自由控制某个页面是否需要静态化
原理：对org.springframework.web.servlet.view.freemarker.FreeMarkerView类进行扩展
第一步：在web.xml中将*.do请求交给SpringMVC

<servlet>      <servlet-name>demo</servlet-name>      <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>      <init-param>          <param-name>contextConfigLocation</param-name>          <param-value>/WEB-INF/demo-servlet.xml</param-value>      </init-param>      <load-on-startup>1</load-on-startup>  </servlet>  <servlet-mapping>      <servlet-name>demo</servlet-name>      <url-pattern>*.do</url-pattern>  </servlet-mapping> 

第二步：配置/WEB-INF/demo-servlet.xml

<!--freemarker页面解析器 --> <bean id="viewResolver"  class="org.springframework.web.servlet.view.freemarker.FreeMarkerViewResolver">        <property name="suffix" value=".ftl"></property>        <property name="contentType" value="text/html;charset=UTF-8" />    　　 <!-- <property name="viewClass" value="org.springframework.web.servlet.view.freemarker.FreeMarkerView" /> -->        <!-- 将Spring的FreeMarkerView改成我们扩展的View -->        <property name="viewClass" value="com.myview.MyFreeMarkerView" />        <property name="exposeRequestAttributes" value="true" />        <property name="exposeSessionAttributes" value="true" />        <property name="exposeSpringMacroHelpers" value="true" /> </bean><bean id="fmXmlEscape" class="freemarker.template.utility.XmlEscape" /><!--配置Freemarker --><bean id="freemarkerConfigurer"  class="org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer">        <property name="templateLoaderPath" value="/WEB-INF/freemarker/"></property>        <property name="freemarkerVariables">            <map>                <entry key="xml_escape" value-ref="fmXmlEscape" />            </map>        </property>        <property name="freemarkerSettings">            <props>                <prop key="template_update_delay">1</prop>                <prop key="defaultEncoding">UTF-8</prop>            </props>        </property>  </bean>

第三步：新建package,com.myview,新建一个MyFreeMarkerView,继承自org.springframework.web.servlet.view.freemarker.FreeMarkerView,在这里对原类进行扩展

package com.myview;import java.io.BufferedWriter;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.io.OutputStreamWriter;import java.io.Writer;import java.util.Locale;import java.util.Map;import javax.servlet.ServletException;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.springframework.web.servlet.support.RequestContextUtils;import org.springframework.web.servlet.view.freemarker.FreeMarkerView;import freemarker.template.SimpleHash;import freemarker.template.Template;import freemarker.template.TemplateException;public class MyFreeMarkerView extends FreeMarkerView{    @Override    protected void doRender(Map<String, Object> model,            HttpServletRequest request, HttpServletResponse response)            throws Exception {        // Expose model to JSP tags (as request attributes).        exposeModelAsRequestAttributes(model, request);        // Expose all standard FreeMarker hash models.        SimpleHash fmModel = buildTemplateModel(model, request, response);        if (logger.isDebugEnabled()) {            logger.debug("Rendering FreeMarker template [" + getUrl() + "] in FreeMarkerView '" + getBeanName() + "'");        }        // Grab the locale-specific version of the template.        Locale locale = RequestContextUtils.getLocale(request);               /*         * 默认生成静态文件,除非在编写ModelAndView时指定CREATE_HTML = false,         * 这样对静态文件生成的粒度控制更细一点         * 例如：ModelAndView mav = new ModelAndView("search");         *       mav.addObject("CREATE_HTML", false);         */        if(Boolean.FALSE.equals(model.get("CREATE_HTML"))){            processTemplate(getTemplate(locale), fmModel, response);        }else{            createHTML(getTemplate(locale), fmModel, request, response);        }    }    public void createHTML(Template template, SimpleHash model,HttpServletRequest request,            HttpServletResponse response) throws IOException, TemplateException, ServletException {            //站点根目录的绝对路径            String basePath = request.getSession().getServletContext().getRealPath("/");            String requestHTML = this.getRequestHTML(request);            //静态页面绝对路径            String htmlPath = basePath + requestHTML;                     File htmlFile = new File(htmlPath);            if(!htmlFile.getParentFile().exists()){                htmlFile.getParentFile().mkdirs();            }            if(!htmlFile.exists()){                htmlFile.createNewFile();            }            Writer out = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(htmlFile), "UTF-8"));            //处理模版             template.process(model, out);            out.flush();            out.close();            /*将请求转发到生成的htm文件*/        request.getRequestDispatcher(requestHTML).forward(request, response);    }    /**     * 计算要生成的静态文件相对路径     * 因为大家在调试的时候一般在Tomcat的webapps下面新建站点目录的，     * 但在实际应用时直接布署到ROOT目录里面,这里要保证路径的一致性。     * @param request HttpServletRequest     * @return /目录/*.htm     */     private String getRequestHTML(HttpServletRequest request){        //web应用名称,部署在ROOT目录时为空        String contextPath = request.getContextPath();        //web应用/目录/文件.do        String requestURI = request.getRequestURI();        //basePath里面已经有了web应用名称，所以直接把它replace掉，以免重复        requestURI = requestURI.replaceFirst(contextPath, "");        //将.do改为.htm,稍后将请求转发到此htm文件        requestURI = requestURI.substring(0, requestURI.indexOf(".")) + ".htm";        return requestURI;     }}

到这里就基本完成了。
一个Controller类的例子：

import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestParam;import org.springframework.web.servlet.ModelAndView;@Controllerpublic class IndexController {    @RequestMapping("/index.do")    public ModelAndView index(){        ModelAndView mav = new ModelAndView("index");        mav.addObject("title", "网站标题");        mav.addObject("origin", "freemarker");        //在这里可以控制不生成静态htm        mav.addObject("CREATE_HTML", false);        return mav;    }    @RequestMapping("/abc/index.do")    public ModelAndView abcindex(){        ModelAndView mav = new ModelAndView("index");        mav.addObject("origin", "html");        //默认生成htm文件        mav.addObject("title", "网站标题");        return mav;    }}

测试结果如下：

源码下载地址：http://vdisk.weibo.com/s/kmkCC