[size=medium]webwork的開發團隊opensymphony提供了一種優雅的解決頁面布局的方法sitemesh。
sitemesh應用Decorator模式，用filter截取request和response,把頁面元件head,content,banner
結合為一個完整的視圖。通常我們都是用include标簽在每個jsp頁面中來不斷的包含各種header,
stylesheet, scripts and footer，現在，在sitemesh的幫助下，我們可以開心的删掉他們了
下邊是建立一個簡單執行個體的步驟：
1，建立一個标準的web工程叫sitemesh
在WebRoot下建立一個index.jsp,内容如下
1 <% @ page contentType = " text/html; charset=utf-8 " %>
2 this is index.jsp.
3 it ' s a simple page
接着在webRoot下建立幾個目錄
style2
login
shared
在login下建立目錄style3
然後把index.jsp分别複制到style2，login/style3,shared下
現在通路下邊的連結:
http://localhost:8080/sitemesh/index.jsp
http://localhost:8080/sitemesh/style2/index.jsp
http://localhost:8080/sitemesh/login/style3/index.jsp
http://localhost:8080/sitemesh/shared/index.jsp
得到的結果是一樣的，那我們如何讓這四個相同的index.jsp有不同的樣式呢。除了每個裡邊加入include
還有個解決辦法，就是sitemesh
2,在opensymphony.sourceforge.net下載下傳sitemesh.jar ,sitemesh-decorator.tld,sitemesh-page.tld
三個檔案。
複制sitemesh.jar到WEB-INF/lib下，
複制sitemesh-decorator.tld,sitemesh-page.tld到WEB-INF下
把下邊這部分加入web.xml
------------------------------------------------------------------------------
<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>style3/*</pattern>
</decorator>
</decorators>
--------------------------------------------------------------------------
在WebRoot下建立一個目錄decorators
然後在下邊建立三個jsp檔案,内容如下
------------------------------------------------------------------
<%@ page contentType="text/html; charset=utf-8"%>
<%@ taglib uri="sitemesh-decorator" prefix="decorator" %>
<html>
<head>
<title><decorator:title default="裝飾器頁面..." /></title>
<decorator:head />
</head>
<body>
<p><font color="red">this is style2's header</font></p>
<hr>
<decorator:body />
<hr>
<p><font color="red">this is style1's footer</font></p>
</body>
</html>
------------------------------------------------------------------
<%@ page contentType="text/html; charset=utf-8"%>
<%@ taglib uri="sitemesh-decorator" prefix="decorator" %>
<html>
<head>
<title><decorator:title default="裝飾器頁面..." /></title>
<decorator:head />
</head>
<body>
<p><font color="green">this is style2's header</font></p>
<hr>
<decorator:body />
<hr>
<p><font color="green">this is style2's footer</font></p>
</body>
</html>
------------------------------------------------------------------
<%@ page contentType="text/html; charset=utf-8"%>
<%@ taglib uri="sitemesh-decorator" prefix="decorator" %>
<html>
<head>
<title><decorator:title default="裝飾器頁面..." /></title>
<decorator:head />
</head>
<body>
<p><font color="blue">this is style3's header</font></p>
<hr>
<decorator:body />
<hr>
<p><font color="blue">this is style3's footer</font></p>
</body>
</html>
------------------------------------------------------------------
再次通路
http://localhost:8080/sitemesh/index.jsp
http://localhost:8080/sitemesh/style2/index.jsp
http://localhost:8080/sitemesh/login/style3/index.jsp
http://localhost:8080/sitemesh/shared/index.jsp
看到變化了吧。這隻是個簡單的展示，仔細思考一下你的需求，你能作出更好的布局方式。
sitemesh真不錯。重要是學習簡單20分種就搞定了[/size]
![sitemesh學習筆記(1)[圖]](data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACwAAAAAAQABAAACAkQBADs=)