（OpenSymphony）SiteMesh简介以及与Strust2集成应该注意的问题
SiteMesh 是一个网页布局和修饰的框架，利用它可以将网页的内容和页面结构分离，以达到页面结构共享、减少代码冗余的目的。
OS(OpenSymphony)的SiteMesh是一个用来在JSP中实现 页面布局和装饰（layout and decoration）的框架组件，能够帮助 网站开发人员较容易实现页面中动态内容和 静态装饰外观的分离。
都说这个东西简单，学习起来20分钟足以，我还是不是很灵泛的那种，估计至少弄了一个小时。。。。。
好了，废话少说，直接开始了。
使用步骤如下：
1.配置web.xml中的siteMesh的过滤器：
<!-- sitemesh filter-->
<filter>
<filter-name>sitemesh</filter-name>
<filter-class>com.opensymphony.sitemesh.webapp.SiteMeshFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>sitemesh</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
2.导入SiteMesh.jar包，我使用的是sitemesh-2.3.jar，好像有点老了。。。。 http://yunpan.cn/QNGG55JPnTHtn http://yunpan.cn/QNGG55JPnTHtn 访问密码 0e80
3.配置WEB-INF下的decorators.xml，内容如下：
<?xml version="1.0" encoding="UTF-8"?>
<decorators defaultdir="/WEB-INF/jsp/decorators">
<!--main decorator-->
<decorator name="main" page="main.jsp">
<pattern>/*</pattern>
</decorator>
<!--<excludes>-->
<!--<pattern>/index.jsp*</pattern>-->
<!--</excludes>-->
</decorators>
4.编写WEB-INF/jsp/decorators下的main.jsp文件，内容举例：
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib uri="http://www.opensymphony.com/sitemesh/decorator" prefix="decorator" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="keywords" content="bookstore, theme, free template, nivo image slider, website, templatemo, CSS, HTML" />
<meta name="description" content="sc.chinaz.com from templatemo.com" />
<link href="${pageContext.request.contextPath}/css/templatemo_style.css" rel="stylesheet" type="text/css" />
<link rel="stylesheet" type="text/css" href="${pageContext.request.contextPath}/css/ddsmoothmenu.css" />
<script type="text/javascript" src="${pageContext.request.contextPath}/script/jquery.min.js"></script>
<script type="text/javascript" src="${pageContext.request.contextPath}/script/ddsmoothmenu.js">
/***********************************************
* Smooth Navigational Menu- (c) Dynamic Drive DHTML code library (www.dynamicdrive.com)
* This notice MUST stay intact for legal use
* Visit Dynamic Drive at http://www.dynamicdrive.com/ for full source code
***********************************************/
</script>
<script type="text/javascript">
ddsmoothmenu.init({
mainmenuid: "templatemo_menu", //menu DIV id
orientation: 'h', //Horizontal or vertical menu: Set to "h" or "v"
classname: 'ddsmoothmenu', //class added to menu's outer DIV
//customtheme: ["#1c5a80", "#18374a"],
contentsource: "markup" //"markup" or ["container_id", "path_to_menu_file"]
});
</script>
<link rel="stylesheet" type="text/css" media="all" href="${pageContext.request.contextPath}/css/jquery.dualSlider.0.2.css" />
<script src="${pageContext.request.contextPath}/script/jquery-1.3.2.min.js" type="text/javascript"></script>
<script src="${pageContext.request.contextPath}/script/jquery.easing.1.3.js" type="text/javascript"></script>
<script src="${pageContext.request.contextPath}/script/jquery.timers-1.2.js" type="text/javascript"></script>
<script src="${pageContext.request.contextPath}/script/jquery.dualSlider.0.3.min.js" type="text/javascript"></script>
<script type="text/javascript">
$(document).ready(function() {
$("#carousel").dualSlider({
auto:true,
autoDelay: 6000,
easingCarousel: "swing",
easingDetails: "easeOutBack",
durationCarousel: 1000,
durationDetails: 600
});
});
</script>
<script type="text/javascript" src="${pageContext.request.contextPath}/script/jquery-1-4-2.min.js"></script>
<link rel="stylesheet" href="${pageContext.request.contextPath}/css/slimbox2.css" type="text/css" media="screen" />
<script type="text/JavaScript" src="${pageContext.request.contextPath}/script/slimbox2.js"></script>
<title><decorator:title default=""/> -- MaoJun Yang</title>
<decorator:head/>
</head>
<body>
<div>
<!-- 相当于head.jsp -->
<div><a href="${pageContext.request.contextPath}/login.jsp">登录</a> <a href="${pageContext.request.contextPath}/register.jsp">注册</a></div>
<div id="templatemo_header_wrapper">
<div id="templatemo_header">
<div id="site_title"><a href="http://sc.chinaz.com/">Free CSS Templates</a></div>
<div id="templatemo_menu" class="ddsmoothmenu">
<ul>
<li><a href="${pageContext.request.contextPath}/index.jsp" class="selected">首页</a></li>
<li><a href="${pageContext.request.contextPath}/about.jsp">关于</a>
<ul>
<li><span class="top"></span><span class="bottom"></span></li>
<li><a href="http://sc.chinaz.com/">图书</a></li>
</ul>
</li>
<li><a href="${pageContext.request.contextPath}/portfolio.jsp">图书列表</a>
<ul>
<li><span class="top"></span><span class="bottom"></span></li>
<li><a href="http://sc.chinaz.com/">图书</a></li>
</ul>
</li>
<li><a href="${pageContext.request.contextPath}/blog.jsp">感言</a></li>
<li><a href="${pageContext.request.contextPath}/contact.jsp">购物车</a></li>
</ul>
<br style="clear: left" />
</div> <!-- end of templatemo_menu -->
<div class="clear"></div>
<!-- 此处是整个WEB目录下的其他jsp页面body插入的位置 -->
<decorator:body/>
</div>
</div>
</div>
<div>
<!-- 此处相当于foot.jsp，当然其他页面不用写其他代码也能有这个foot.jsp -->
<div id="templatemo_footer_wrapper">
<div id="templatemo_footer">
<div class="col one_fourth">
<h4>Photo Gallery</h4>
<ul class="footer_gallery">
<li><a href="${pageContext.request.contextPath}/images/templatemo_image_03_l.jpg" rel="lightbox[portfolio]"><img src="${pageContext.request.contextPath}/images/templatemo_image_03.jpg" alt="image" /></a></li>
<li><a href="${pageContext.request.contextPath}/images/templatemo_image_04_l.jpg" rel="lightbox[portfolio]"><img src="${pageContext.request.contextPath}/images/templatemo_image_04.jpg" alt="image" /></a></li>
<li><a href="${pageContext.request.contextPath}/images/templatemo_image_05_l.jpg" rel="lightbox[portfolio]"><img src="${pageContext.request.contextPath}/images/templatemo_image_05.jpg" alt="image" /></a></li>
<li><a href="${pageContext.request.contextPath}/images/templatemo_image_06_l.jpg" rel="lightbox[portfolio]"><img src="${pageContext.request.contextPath}/images/templatemo_image_06.jpg" alt="image" /></a></li>
<li><a href="${pageContext.request.contextPath}/images/templatemo_image_07_l.jpg" rel="lightbox[portfolio]"><img src="${pageContext.request.contextPath}/images/templatemo_image_07.jpg" alt="image" /></a></li>
<li><a href="${pageContext.request.contextPath}/images/templatemo_image_08_l.jpg" rel="lightbox[portfolio]"><img src="${pageContext.request.contextPath}/images/templatemo_image_08.jpg" alt="image" /></a></li>
<li><a href="${pageContext.request.contextPath}/images/templatemo_image_09_l.jpg" rel="lightbox[portfolio]"><img src="${pageContext.request.contextPath}/images/templatemo_image_09.jpg" alt="image" /></a></li>
<li><a href="${pageContext.request.contextPath}/images/templatemo_image_10_l.jpg" rel="lightbox[portfolio]"><img src="${pageContext.request.contextPath}/images/templatemo_image_10.jpg" alt="image" /></a></li>
<li><a href="${pageContext.request.contextPath}/images/templatemo_image_11_l.jpg" rel="lightbox[portfolio]"><img src="${pageContext.request.contextPath}/images/templatemo_image_11.jpg" alt="image" /></a></li>
</ul>
<div class="clear"></div>
<a href="portfolio.jsp" class="more">更多</a>
</div>
<div class="col one_fourth">
<h4>最近</h4>
<ul class="no_bullet">
<li>
<span class="header"><a href="#"></a></span>
</li>
<li>
<span class="header"><a href="#">Ipsum dolor sit amet</a></span>
.
</li>
<li>
<span class="header"><a href="#">吖吖</a></span>
做大大大大双刀地飞
</li>
</ul>
</div>
<div class="col one_fourth">
<h4>Twitter</h4>
<ul class="no_bullet">
<li><a href="#">@templatemo</a> </li>
<li>联系 <a href="#">#FREE</a> </li>
<li> <a href="#">http://bit.ly/13IwZO</a></li>
<li> <a href="#">http://bit.ly/IyyUoO</a></li>
</ul>
</div>
<div class="col one_fourth no_margin_right">
<h4>About</h4>
<p>
版权归属<a href="#">Your Company Name</a> | Collect from <a href="http://www.cssmoban.com/" title="网站模板" target="_blank">网站模板</a>
</div>
<div class="clear"></div>
</div> <!-- END of footer -->
</div> <!-- END of footer wrapper -->
</div>
</body>
</html>
5.这个main.jsp只是个例子而已，其中必须要定义那个前缀：decorator，然后才能使用<decorator:title default=""/>、<decorator:head/>、<decorator:body/>等等。之后的话，只要是在整个web根目录下的jsp都会被这个SitMesh所装饰。
最后要说说的是：
与Strust2集成应该注意的问题
要注意SiteMesh过滤器在web.xml中位置，必须在Strust2过滤器的前面，否则，通过Strust2跳转的jsp页面都将没有SiteMesh的装饰效果，其原因是：Strust2的所有值都是保存在Stack Context或者ValueStack中的，默认情况是，某个过滤器一旦访问了改Stack Context或者ValueStack后，里面对应的值将会被清除掉，如果先使用Strust2的FilterDispatcher来过滤用户请求，则SiteMesh的过滤器将无法取得Stack Context或者ValueStack中的数据。
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