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SPRINGMVC ,FREEMARKER页面自动静态化

发表于 分类于

1.maven 配置

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<dependency>
　　<groupId>org.freemarker</groupId>
　　<artifactId>freemarker</artifactId>
　　<version>2.3.20</version>
</dependency>
<dependency>
　　<groupId>freemarker</groupId>
　　<artifactId>freemarker</artifactId>
　　<version>2.3.8</version>
</dependency>
<dependency>
　　<groupId>org.springframework</groupId>
　　<artifactId>spring-context-support</artifactId>
　　<version>4.2.4.RELEASE</version>
</dependency>
2.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)

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<!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

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package com.freemarker.Controller;
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 FreeMarkerViewUtil 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 模版 [” + 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;
        System.out.println(“静态页面绝对路径===========>>:”+htmlPath);
        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.html,稍后将请求转发到此html文件
        requestURI = requestURI.substring(0, requestURI.indexOf(“.”)) + “.html”;
        return requestURI;
    }
}
package com.freemarker.Controller;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;
import com.spring.vo.User;
@Controller
@RequestMapping(“/home”)
public class FreeMarkerController {
    @RequestMapping(“index1”)
    public ModelAndView Add(HttpServletRequest request, HttpServletResponse response) {
        ModelAndView mav = new ModelAndView(“index”);
        User user = new User();
        user.setUsername(“<h2>小明=========================================================></h2>”);
        user.setPassword(“<a href=’https://www.hao123.com/’>百度</a>”;);
        List<User> users = new ArrayList<User>();
        users.add(user);
        mav.addObject(“users”, users);
        return mav;
    }
    @RequestMapping(“index2”)
    public ModelAndView index() {
        ModelAndView mav = new ModelAndView(“index”);
        mav.addObject(“title”, “网站标题”);
        //说明：在这里可以控制不生成静态htm
        mav.addObject(“CREATE_HTML”, false);
        return mav;
    }
}

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

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mav.addObject(“CREATE_HTML”, false);