springMVC、freemarker页面半自动静态化

来源：互联网发布：激战2捏脸数据编辑：程序博客网时间：2024/04/27 02:24

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

如果看图不懂的呢，说白了这个中技术就是：java对象+ftl模型=输出html视图

1、在sprinMVC中：MVC框架中的View层组件、Html页面静态化、代码生成工具

2、为什么要用FreeMarker：简单容易学、逻辑分离明确

3、FreeMarker优点：FreeMarker不依赖于Servlet，网络或Web 环境(没一毛钱关系)

maven

 1 <dependency> 2 　　<groupId>org.freemarker</groupId> 3 　　<artifactId>freemarker</artifactId> 4 　　<version>2.3.20</version> 5 </dependency> 6 <dependency> 7 　　<groupId>freemarker</groupId> 8 　　<artifactId>freemarker</artifactId> 9 　　<version>2.3.8</version>10 </dependency>11 <dependency>12 　　<groupId>org.springframework</groupId>13 　　<artifactId>spring-context-support</artifactId>14 　　<version>4.2.4.RELEASE</version>15 </dependency>

一、web.xml配置(配置大部分都一样)

二、在springMVC文件中配置freemarker视图解析器

<!--FreeMarker视图解析器 -->    <bean id="viewResolver"        class="org.springframework.web.servlet.view.freemarker.FreeMarkerViewResolver">        <property name="suffix" value=".ftl" />        <property name="contentType" value="text/html;charset=UTF-8"></property>        <property name="viewClass" value="com.freemarker.Controller.FreeMarkerViewUtil" />        <property name="exposeRequestAttributes" value="true" />        <property name="exposeSessionAttributes" value="true" />        <property name="exposeSpringMacroHelpers" value="true" />    </bean>    <bean id="fmXmlEscape" class="freemarker.template.utility.XmlEscape" />    <!-- Freemarker配置 -->    <bean id="freemarkerConfig"        class="org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer">        <property name="templateLoaderPath" value="/WEB-INF/view/" />        <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="default_encoding">UTF-8</prop>                <prop key="number_format">0.##########</prop>                <prop key="datetime_format">yyyy-MM-dd HH:mm:ss</prop>                <prop key="classic_compatible">true</prop>                <prop key="template_exception_handler">ignore</prop>            </props>        </property>    </bean>

三、建立模型文件(freemarker完全支持el表达式语言)

我的目录是：WebContent/WEB-INF/view/index.ftl，建立一个文件后缀为ftl即可！

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> 　　<title>演示${title}</title> 　　<meta http-equiv="pragma" content="no-cache"> 　　<meta http-equiv="cache-control" content="no-cache"> 　　<meta http-equiv="expires" content="0"> 　　<meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> 　　<meta http-equiv="description" content="This is my page"> 　　<meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> </head> <body> 　　<#list users as user> 　　测试..............username : ${user.username} 　　测试..............password : ${user.password} 　　</#list></body> </html>

四、编写视图解析器(FreeMarkerViewUtil.java),继承自org.springframework.web.servlet.view.freemarker.FreeMarkerView在这里对原类进行扩展

 1 package com.freemarker.Controller; 2  3 import java.io.BufferedWriter; 4 import java.io.File; 5 import java.io.FileOutputStream; 6 import java.io.IOException; 7 import java.io.OutputStreamWriter; 8 import java.io.Writer; 9 import java.util.Locale;10 import java.util.Map;11 import javax.servlet.ServletException;12 import javax.servlet.http.HttpServletRequest;13 import javax.servlet.http.HttpServletResponse;14 import org.springframework.web.servlet.support.RequestContextUtils;15 import org.springframework.web.servlet.view.freemarker.FreeMarkerView;16 import freemarker.template.SimpleHash;17 import freemarker.template.Template;18 import freemarker.template.TemplateException;19 20 public class FreeMarkerViewUtil extends FreeMarkerView {21     @Override22     protected void doRender(Map<String, Object> model, HttpServletRequest request, HttpServletResponse response)23             throws Exception {24         // Expose model to JSP tags (as request attributes).25         exposeModelAsRequestAttributes(model, request);26         // Expose all standard FreeMarker hash models.27         SimpleHash fmModel = buildTemplateModel(model, request, response);28 29         if (logger.isDebugEnabled()) {30             logger.debug("Rendering FreeMarker 模版 [" + getUrl() + "] in FreeMarkerView '" + getBeanName() + "'");31         }32         // Grab the locale-specific version of the template.33         Locale locale = RequestContextUtils.getLocale(request);34 35         /*36          * 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37          * 例如：ModelAndView mav = new ModelAndView("search");38          * mav.addObject("CREATE_HTML", false);39          */40         if (Boolean.FALSE.equals(model.get("CREATE_HTML"))) {41             processTemplate(getTemplate(locale), fmModel, response);42         } else {43             createHTML(getTemplate(locale), fmModel, request, response);44         }45     }46 47     public void createHTML(Template template, SimpleHash model, HttpServletRequest request,48             HttpServletResponse response) throws IOException, TemplateException, ServletException {49         // 站点根目录的绝对路径50         String basePath = request.getSession().getServletContext().getRealPath("/");51         String requestHTML = this.getRequestHTML(request);52         // 静态页面绝对路径53         String htmlPath = basePath + requestHTML;54         System.out.println("静态页面绝对路径===========>>:"+htmlPath);55         File htmlFile = new File(htmlPath);56         if (!htmlFile.getParentFile().exists()) {57             htmlFile.getParentFile().mkdirs();58         }59         if (!htmlFile.exists()) {60             htmlFile.createNewFile();61         }62         Writer out = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(htmlFile), "UTF-8"));63         // 处理模版64         template.process(model, out);65         out.flush();66         out.close();67         /* 将请求转发到生成的htm文件 */68         request.getRequestDispatcher(requestHTML).forward(request, response);69     }70 71     /**72      * 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，73      * 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。74      * 75      * @param request76      *            HttpServletRequest77      * @return /目录/*.htm78      */79     private String getRequestHTML(HttpServletRequest request) {80         // web应用名称,部署在ROOT目录时为空81         String contextPath = request.getContextPath();82         // web应用/目录/文件.do83         String requestURI = request.getRequestURI();84         // basePath里面已经有了web应用名称，所以直接把它replace掉，以免重复85         requestURI = requestURI.replaceFirst(contextPath, "");86         // 将.do改为.html,稍后将请求转发到此html文件87         requestURI = requestURI.substring(0, requestURI.indexOf(".")) + ".html"; 88         return requestURI;89     }90 }

五、测试类(Controller)

 1 package com.freemarker.Controller; 2  3 import java.util.ArrayList; 4 import java.util.List; 5  6 import javax.servlet.http.HttpServletRequest; 7 import javax.servlet.http.HttpServletResponse; 8 import org.springframework.stereotype.Controller; 9 import org.springframework.web.bind.annotation.RequestMapping;10 import org.springframework.web.servlet.ModelAndView;11 import com.spring.vo.User;12 13 @Controller14 @RequestMapping("/home")15 public class FreeMarkerController {16 17     @RequestMapping("index1")18     public ModelAndView Add(HttpServletRequest request, HttpServletResponse response) {19         ModelAndView mav = new ModelAndView("index");20         User user = new User();21         user.setUsername("<h2>小明=========================================================></h2>");22         user.setPassword("<a href='https://www.hao123.com/'>百度</a>");23         List<User> users = new ArrayList<User>();24         users.add(user);25         mav.addObject("users", users);26         return mav;27     }28 29     @RequestMapping("index2")30     public ModelAndView index() {31         ModelAndView mav = new ModelAndView("index");32         mav.addObject("title", "网站标题");33         //说明：在这里可以控制不生成静态htm34         mav.addObject("CREATE_HTML", false);35         return mav;36     }37 }

访问：http://localhost:1010/springMVC_FreeMarker/home/index1.do，访问index1.do才会生成html文件，生成的html文件是根据@RequestMapping("index1")name决定的.

　　　如果不需要生成静态化页面

mav.addObject("CREATE_HTML", false);

文件目录

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