SpringMVC+FreeMarker实现半自动静态化
感谢imyourgod的原贴http://topic.csdn.net/u/20090613/12/30302a5d-33c0-4ce4-b9e3-cd503dbafac1.html
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：
package
com.controller;
import
org.springframework.stereotype.Controller;
import
org.springframework.web.bind.annotation.RequestMapping;
import
org.springframework.web.servlet.ModelAndView; @Controller
public
class
IndexController { @RequestMapping(
"
/index
"
)
public
ModelAndView index(){ ModelAndView mav
=
new
ModelAndView(
"
index
"
); mav.addObject(
"
title
"
,
"
网站标题
"
);
//
在这里可以控制不生成静态htm
mav.addObject(
"
CREATE_HTML
"
,
false
);
return
mav; } @RequestMapping(
"
/abc/index
"
)
public
ModelAndView abcindex(){ ModelAndView mav
=
new
ModelAndView(
"
index
"
);
//
默认生成htm文件
mav.addObject(
"
title
"
,
"
网站标题
"
);
return
mav; } }