spring mvc用freemarker进行页面静态化
这是spring-mvc.xml里对freemarker的相关配置
<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" /> <!-- 将Spring的FreeMarkerView改成我们扩展的View --> <property name="viewClass" value="xidian.hy.wendu.test.freemarker.ExFreeMarkerView" /> <property name="exposeSpringMacroHelpers" value="true" /> <property name="exposeRequestAttributes" value="true" /> <property name="exposeSessionAttributes" value="true" /> <property name="exposePathVariables" value="true" /> <property name="allowSessionOverride" value="true" /> </bean> <bean id="fmXmlEscape" class="freemarker.template.utility.XmlEscape" /> <bean id="freemarkerConfig" class="org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer"> <!-- 指定FreeMarker模板文件目录 --> <property name="templateLoaderPath" value="/WEB-INF/test/" /> <property name="freemarkerVariables"> <map> <entry key="xml_escape" value-ref="fmXmlEscape" /> </map> </property> <property name="freemarkerSettings"> <props> <prop key="defaultEncoding">UTF-8</prop> <prop key="locale">zh_CN</prop> </props> </property> </bean>
这是VIEW类
public class ExFreeMarkerView extends FreeMarkerView {
@Override
protected void doRender(Map<String, Object> model, HttpServletRequest request, HttpServletResponse response) throws Exception {
exposeModelAsRequestAttributes(model, request);
SimpleHash fmModel = buildTemplateModel(model, request, response);
if (logger.isDebugEnabled()) {
logger.debug("Rendering FreeMarker template [" + getUrl() + "] in FreeMarkerView '" + getBeanName() + "'");
}
Locale locale = RequestContextUtils.getLocale(request);
/*
* 在这里我们默认生成<strong>静态</strong>文件,当ModelAndView有指定STATIC_HTML = false时,就不会输出HTML文件 例如：ModelAndView modelAndView = new ModelAndView("htmlTest"); modelAndView.addObject("STATICHTML", false);
*/
if (Boolean.FALSE.equals(model.get("STATIC_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);
//<strong>静态</strong><strong>页面</strong>绝对路径
String htmlPath = basePath + requestHTML;
File htmlFile = new File(htmlPath);
if (!htmlFile.getParentFile().exists()) {
htmlFile.getParentFile().mkdirs();
}
/**
* 如果<strong>静态</strong><strong>页面</strong>已经存在,就不再创建<strong>静态</strong><strong>页面</strong>.
*/
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<strong>静态</strong>文件相对路径.
*/
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, "");
//将请求改为.htm,稍后将请求转发到此htm文件
requestURI += ".htm";
return requestURI;
}
}结果在继承了FreeMarkerView的类里生成好了静态页面进行重跳转
request.getRequestDispatcher("statictest.htm").forward(request, response);
的时候报错
javax.servlet.ServletException: Cannot expose bind macro helper 'springMacroRequestContext' because of an existing model object of the same name at org.springframework.web.servlet.view.AbstractTemplateView.renderMergedOutputModel(AbstractTemplateView.java:156) at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:262) at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1180) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:950) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:852) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882) at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:778) at javax.servlet.http.HttpServlet.service(HttpServlet.java:621) at javax.servlet.http.HttpServlet.service(HttpServlet.java:728) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:749) at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:487) at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:412) at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:339) at xidian.hy.wendu.test.freemarker.ExFreeMarkerView.createHTML(ExFreeMarkerView.java:76) at xidian.hy.wendu.test.freemarker.ExFreeMarkerView.doRender(ExFreeMarkerView.java:43) at org.springframework.web.servlet.view.freemarker.FreeMarkerView.renderMergedTemplateModel(FreeMarkerView.java:233) at org.springframework.web.servlet.view.AbstractTemplateView.renderMergedOutputModel(AbstractTemplateView.java:167) at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:262) at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1180) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:950) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:852) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882) at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:778) at javax.servlet.http.HttpServlet.service(HttpServlet.java:621) at javax.servlet.http.HttpServlet.service(HttpServlet.java:728) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) at org.springframework.orm.hibernate4.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:119) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:61) at org.apache.shiro.web.servlet.AdviceFilter.executeChain(AdviceFilter.java:108) at org.apache.shiro.web.servlet.AdviceFilter.doFilterInternal(AdviceFilter.java:137) at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125) at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:66) at org.apache.shiro.web.servlet.AbstractShiroFilter.executeChain(AbstractShiroFilter.java:449) at org.apache.shiro.web.servlet.AbstractShiroFilter$1.call(AbstractShiroFilter.java:365) at org.apache.shiro.subject.support.SubjectCallable.doCall(SubjectCallable.java:90) at org.apache.shiro.subject.support.SubjectCallable.call(SubjectCallable.java:83) at org.apache.shiro.subject.support.DelegatingSubject.execute(DelegatingSubject.java:383) at org.apache.shiro.web.servlet.AbstractShiroFilter.doFilterInternal(AbstractShiroFilter.java:362) at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125) at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346) at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:259) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589) at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:1852) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:722)
如果你对这篇内容有疑问，欢迎到本站社区发帖提问 参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。
绑定邮箱获取回复消息
由于您还没有绑定你的真实邮箱，如果其他用户或者作者回复了您的评论，将不能在第一时间通知您！
发布评论
评论（10）
我也发现这个问题了。那要怎么解决呢~
下面request.getRequestDispatcher(requestHTML).forward(request, response);还是会再次进入这个 viewer。当第二次执行
exposeModelAsRequestAttributes(model, request);
的时候 spring觉得这是不安全的，就报错了
很不错的功能哦,帮忙一块加入
springrain吧
第一个只截取了部分..
不好意思 an existing model object of the same nameat org.springframework.web.servlet.view.AbstractTemplateView.renderMergedOutputModel，我以为他有用呢，不过这个问题没遇到过。
错误的第一句很明显。。。
freemarker这玩意太恐怖了，崩一堆错误出来，然后页面布局就撑爆了。
断点下来发现在被拦截进入这个类的时候就已经存在了,按照配置来看exposeSpringMacroHelpers这个属性应该就是对应这个问题的,因为allowSessionOverride解决了Cannot expose session attribute 'xxx' because of an existing model object of the same name这个异常,
需要看一下你的View是怎么写的，AbstractTemplateView的renderMergedOutputModel()要求model中的springMacroRequestContext 应该由他自己添加，确认下是否有占用或有重复调用，实在不行debug一下，看看哪些地方往Model添加了这个的属性
我又来自己解决问题了...
起初我就怀疑是因为我spring mvc拦截了所有/请求的关系,所以我新建了一个项目,controller是以.do为结尾的拦截,果然这次没有出现任何问题,成功静态化.
这个和以前我使用AOP的时候出现的一个小问题有点像,就是当时把满足get*的方法都拦截了,结果出现了tomcat启动报错,把外延缩小以后,成功启动.说明在以所以get开头的方法里包含到了spring启动的方法.所以在/拦截里可能也发生了这样的错误