SSH项目中，jQuery AJAX响应速度超慢，SiteMesh filter惹的祸
解决方案：避免用不到SiteMesh的AJAX请求被SiteMesh拦截，具体如下
（1）给Struts2配两个后缀，如.do,.ajax
（2）SiteMesh中只拦截后缀为.do的请求
（3）不用SiteMesh的AJAX action请求以.ajax结尾
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配置文件改动：
（1）struts.xml
<constant name="struts.action.extension" value="do,ajax"></constant>
（2）web.xml
<!-- SiteMesh --><filter><filter-name>sitemesh</filter-name><filter-class>com.opensymphony.module.sitemesh.filter.PageFilter</filter-class></filter><filter-mapping><filter-name>sitemesh</filter-name><url-pattern>*.do</url-pattern></filter-mapping><!-- Struts2 --><filter><filter-name>struts2</filter-name><filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class></filter><filter-mapping><filter-name>struts2</filter-name><url-pattern>*.do</url-pattern></filter-mapping><filter-mapping><filter-name>struts2</filter-name><url-pattern>*.ajax</url-pattern></filter-mapping>
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