更多详细使用方法，可以查看demo
需要到http://www.opensymphony.com/sitemesh/下载Jar及demo(取其中的两个tld以及sitemesh.xml)
web.xml：
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<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>/*</url-pattern>
</filter-mapping>
<jsp-config>
<taglib>
<taglib-uri>sitemesh-page</taglib-uri>
<taglib-location>/WEB-INF/sitemesh-page.tld</taglib-location>
</taglib>
<taglib>
<taglib-uri>sitemesh-decorator</taglib-uri>
<taglib-location>/WEB-INF/sitemesh-decorator.tld</taglib-location>
</taglib>
</jsp-config>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>
sitemesh.xml：
<sitemesh>
<property name="decorators-file" value="/WEB-INF/decorators.xml"/>
<excludes file="${decorators-file}"/>
<page-parsers>
<parser content-type="text/html" class="com.opensymphony.module.sitemesh.parser.HTMLPageParser" />
</page-parsers>
<decorator-mappers>
<mapper class="com.opensymphony.module.sitemesh.mapper.PageDecoratorMapper">
<param name="property.1" value="meta.decorator" />
<param name="property.2" value="decorator" />
</mapper>
<mapper class="com.opensymphony.module.sitemesh.mapper.FrameSetDecoratorMapper">
</mapper>
<mapper class="com.opensymphony.module.sitemesh.mapper.AgentDecoratorMapper">
<param name="match.MSIE" value="ie" />
<param name="match.Mozilla [" value="ns" />
<param name="match.Opera" value="opera" />
<param name="match.Lynx" value="lynx" />
</mapper>
<mapper class="com.opensymphony.module.sitemesh.mapper.PrintableDecoratorMapper">
<param name="decorator" value="printable" />
<param name="parameter.name" value="printable" />
<param name="parameter.value" value="true" />
</mapper>
<mapper class="com.opensymphony.module.sitemesh.mapper.RobotDecoratorMapper">
<param name="decorator" value="robot" />
</mapper>
<mapper class="com.opensymphony.module.sitemesh.mapper.ParameterDecoratorMapper">
<param name="decorator.parameter" value="decorator" />
<param name="parameter.name" value="confirm" />
<param name="parameter.value" value="true" />
</mapper>
<mapper class="com.opensymphony.module.sitemesh.mapper.FileDecoratorMapper">
</mapper>
<mapper class="com.opensymphony.module.sitemesh.mapper.ConfigDecoratorMapper">
<param name="config" value="${decorators-file}" />
</mapper>
</decorator-mappers>
</sitemesh>
decorators.xml：
<?xml version="1.0" encoding="utf-8"?>
<decorators defaultdir="/decorators">
<!-- Any urls that are excluded will never be decorated by Sitemesh -->
<excludes>
<pattern>/index.jsp*</pattern>
<pattern>/login/*</pattern>
</excludes>
<decorator name="main" page="main.jsp">
<pattern>/*</pattern>
</decorator>
</decorators>
main.jsp：
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib uri="sitemesh-decorator" prefix="decorator"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title><decorator:title default="title Of main.jsp"></decorator:title></title>
<decorator:head></decorator:head>
</head>
<body
<decorator:getProperty property="body.onload" writeEntireProperty="true"></decorator:getProperty>
<decorator:getProperty property="body.style" writeEntireProperty="true"></decorator:getProperty>
<decorator:getProperty property="body.id" writeEntireProperty="true"></decorator:getProperty>
>
This is my main JSP page. <br>
<decorator:body></decorator:body>
</body>
</html>