sitemesh 了解
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sitemesh2.4
Sitemesh 是由一个基于 Web 页面布局、装饰及与现存 Web 应用整合的框架。它能帮助我们由大量页面工程的项目中创建一致的页面布局和外观,如一 致的导航条、一致的 banner 、一致的版权等。它不仅能处理动态的内容,如 JSP 、 PHP 、 ASP 、 CGI 等产生的内容,还能处理静态的内容,比如 HTML 的内容,使得它的内容也符合你的页面结构的要求。甚至它能像 include 那样将 HTML 文件作为一个面板的形式嵌入到别的文件中去。它的主要思想是装饰模式。
前提:依赖于 >=Servlet 2.3 版本里引入的新功能 —— 过滤器 (Filters) 。
好处:
使用 sitemesh 给我们带来的是不仅仅是页面结构问题,它的出现让我们有更多的时间去关注底层业务逻辑,而不是整个页面的风格和结构。它让我们摆脱了大量用 include 方式复用页面尴尬局面,它也提供了很大的灵活性以及给我们提供了整合异构 Web 系统页面的一种方案。
部署:
首先需要导入 sitemesh-2.4.2.jar 由于是 struts2.1.8 整合 sitemesh 的所以还需要导入 struts2-sitemesh-plugin-2.1.6.jar( 目前还没有 struts2-sitemesh-plugin-2.1.8.jar 的 ).
Web.xml 文件中的配置:
< filter >
<filter-name > struts2 </ filter-name>
< filter-class> org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</ filter-class>
</filter >
<filter >
<filter-name > struts-cleanup </ filter-name >
<filter-class >org.apache.struts2.dispatcher.ActionContextCleanUp</ filter-class>
</filter >
<filter >
<filter-name > sitemesh </ filter-name>
< filter-class> com.opensymphony.module.sitemesh.filter.PageFilter</ filter-class>
</ filter >
< filter-mapping >
<filter-name > struts-cleanup </ filter-name >
<url-pattern > /* </ url-pattern>
<dispatcher > REQUEST </ dispatcher>
<dispatcher > FORWARD </ dispatcher>
</filter-mapping >
<filter-mapping >
<filter-name > sitemesh </ filter-name>
<url-pattern > /* </ url-pattern>
<dispatcher > REQUEST </ dispatcher>
<dispatcher > FORWARD </ dispatcher>
</filter-mapping >
<filter-mapping >
<filter-name > struts2 </ filter-name>
<url-pattern > /* </ url-pattern>
<dispatcher > REQUEST </ dispatcher>
<dispatcher > FORWARD </ dispatcher>
</ filter-mapping >
以上的配置是根据 url 进行装饰的。如果想根据物理路径来进行装饰,就把 sitemesh 和 struts2 位置换一下就ok 了。
Sitemesh 自己也需要配置文件:比如decorators.xml , sitemesh.xml , sitemesh-decorator.tld, sitemesh-page.tld。 decorators.xml 是必须要的,其它的可要可不要,主要取决于项目的复杂性。
decorators.xml 配置文件的讲解:
<? xmlversion = "1.0" encoding= "utf-8"?>
< decorators defaultdir = "/WEB-INF/decorators" ><!—-定义一个绝对路径 —>
<!-- excludes 标签标示不需要进行装饰的 url -- >
<excludes >
<pattern > /css /* </ pattern>
<pattern > /js /* </ pattern>
<pattern > /images/* </ pattern>
<pattern > /buyer/viewmerchantproduct * </ pattern >
<pattern > /buyer/toindex.do* </ pattern >
<pattern > /buyer/buyerlogout.do </ pattern >
<pattern > */admin -ajax /* </ pattern >
<pattern > */merchant/tomerchantlogin.do* </ pattern >
<pattern > */admin /toadminlogin.do* </ pattern >
<pattern > */admin /adminlogin.do* </ pattern >
<pattern > /merchant/info/login.do* </ pattern >
<pattern > /merchant/report/* </ pattern >
</ excludes>
<!—- 以下是定义一些模板主要包括模板的 name 和 page -->
<decorator name= "adminmain"page = "adminmain.jsp" >
<pattern > /admin /* </ pattern>
</decorator >
<decorator name= "buyerbackstagemain"page = "buyerbacktage.jsp" >
<pattern > /buyer/backstage/* </ pattern >
</decorator >
<decorator name= "seobuyermain"page = "seobuyermain.jsp" >
<pattern > /buyer/viewcategoryproduct.do* </ pattern >
<pattern > /buyer/viewrootcategory.do* </ pattern >
<pattern > /buyer/viewstandproductdetail.do* </ pattern >
<pattern > /buyer/viewproductreview.do* </ pattern >
</decorator >
<decorator name= "buyermain"page = "buyermain.jsp" >
<pattern > /admin /previewproduct /* </ pattern >
<pattern > /buyer/* </ pattern>
<pattern > /adminpreview /previewbuyerhelpatricle.do </pattern >
<pattern > /adminpreview /previewbuyerupdateatricle.do </pattern >
</decorator >
</ decorators >
注意:模板的名字不要相同 , 如果相同错是不会报,只会被最后的那个相同名字的模板装饰。
url 拦截优先级:主要是配备的越精确优先级就高,不是谁在前面谁的优先级就高。
sitemesh 标签讲解:
<decorator:title default="Welcome to test sitemesh!" /> :读取被装饰页面的标题,并给出了默认标题。
<decorator:head /> :读取被装饰页面的 <head> 中的内容;
<decorator:body /> :读取被装饰页面的 <body> 中的内容;
当然还有很多的标签,这里不再详细描述。
SiteMesh基本用法及示例
SiteMesh是基于Servlet的filter的,即过滤流。它是通过截取reponse,并进行装饰后再交付给客户。
其中涉及到两个名词: 装饰页面(decorator page)和 “被装饰页面(Content page)" , 即 SiteMesh通过对Content Page的装饰,最终得到页面布局和外观一直的页面,
并返回给客户
运行环境需要:servlet2.3 , JDK1.4 以上。
正常模式下的web访问流程
加入SiteMesh装饰的web访问流程
一:搭建SiteMesh环境及简单使用
1.1:准备资源
siteMesh2.4.jar, sitemesh-page.tld , sitemesh-decorator.tld 这个三个必要文件
将jar包复制进/WEB-INF/lib目录下, 两个tld文件导入/WEB-INF下即可
在web.xml中加入siteMesh的filter和taglib
- <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>
- <!-- not required for containers that fully support JSP 1.2 -->
- <taglib>
- <taglib-uri>sitemesh-page</taglib-uri>
- <taglib-location>/WEB-INF/lib/sitemesh-page.tld</taglib-location>
- </taglib>
- <taglib>
- <taglib-uri>sitemesh-decorator</taglib-uri>
- <taglib-location>/WEB-INF/lib/sitemesh-decorator.tld</taglib-location>
- </taglib>
<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> <!-- not required for containers that fully support JSP 1.2 --> <taglib> <taglib-uri>sitemesh-page</taglib-uri> <taglib-location>/WEB-INF/lib/sitemesh-page.tld</taglib-location> </taglib> <taglib> <taglib-uri>sitemesh-decorator</taglib-uri> <taglib-location>/WEB-INF/lib/sitemesh-decorator.tld</taglib-location> </taglib>
1.2 建立decorators.xml
在/WEB-INF下创建decorators.xml文件,siteMesh通过该文件来获知"装饰页面"和"被装饰页面"的映射
decorators.xml
- <?xml version="1.0" encoding="UTF-8"?>
- <!-- 默认目录 -->
- <decorators defaultdir="/decorators">
- <!-- 缺省装饰页 -->
- <decorator name="main" page="main.jsp">
- <pattern>/*</pattern>
- </decorator>
- <!-- 自定义装饰页,我们下面实例就是这部分起作用 -->
- <decorator name="mai" page="mai.jsp">
- <pattern>/mai.html</pattern>
- </decorator>
- <!-- 只装饰一个页面也可用这种方式定义 -->
- <decorator name="panel" page="panel.jsp"/>
- <!-- 装饰velocity模板 -->
- <decorator name="velocity" page="velocity.vm">
- <pattern>/velocity.html</pattern>
- </decorator>
- <!-- 装饰freeMarker模板 -->
- <decorator name="freemarker" page="freemarker.ftl">
- <pattern>/freemarker.html</pattern>
- </decorator>
- <decorator name="test" page="test.jsp">
- <pattern>/agent.jsp</pattern>
- </decorator>
- </decorators>
<?xml version="1.0" encoding="UTF-8"?><!-- 默认目录 --><decorators defaultdir="/decorators"> <!-- 缺省装饰页 --> <decorator name="main" page="main.jsp"> <pattern>/*</pattern> </decorator> <!-- 自定义装饰页,我们下面实例就是这部分起作用 --> <decorator name="mai" page="mai.jsp"> <pattern>/mai.html</pattern> </decorator> <!-- 只装饰一个页面也可用这种方式定义 --> <decorator name="panel" page="panel.jsp"/> <!-- 装饰velocity模板 --> <decorator name="velocity" page="velocity.vm"> <pattern>/velocity.html</pattern> </decorator> <!-- 装饰freeMarker模板 --> <decorator name="freemarker" page="freemarker.ftl"> <pattern>/freemarker.html</pattern> </decorator> <decorator name="test" page="test.jsp"> <pattern>/agent.jsp</pattern> </decorator></decorators>
下边是对上边中所缺少的一些补充
- <?xml version="1.0" encoding="utf-8"?>
- <decorators defaultdir="/decorators">
- <!-- 此处用来定义不需要过滤的页面 -->
- <excludes>
- </excludes>
- <!-- 用来定义装饰器要过滤的页面 -->
- <decorator name="main" page="main.jsp">
- <pattern>/*</pattern>
- </decorator>
- </decorators>
<?xml version="1.0" encoding="utf-8"?> <decorators defaultdir="/decorators"> <!-- 此处用来定义不需要过滤的页面 --> <excludes> </excludes> <!-- 用来定义装饰器要过滤的页面 --> <decorator name="main" page="main.jsp"> <pattern>/*</pattern> </decorator> </decorators>
1.3 装饰页的创建
在web目录(或者webContent)下创建文件夹decorators,在文件夹中建立mai.jsp文件
- <%@ page language="java" contentType="text/html; charset=UTF-8"
- pageEncoding="UTF-8"%>
- <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
- <html>
- /*这里导入了SiteMesh的标签库 */
- <%@ taglib uri="http://www.opensymphony.com/sitemesh/decorator" prefix="decorator" %>
- <%@ taglib uri="http://www.opensymphony.com/sitemesh/page" prefix="page" %>
- <head>
- <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
- OK,there is a decorator begin!<hr />
- /*这里的意思是,被装饰页的title内容将会在这里插入 */
- <decorator:title></decorator:title>
- </head>
- <body>
- /*被修饰页的body内容将在这里插入
- <decorator:body></decorator:body>
- <hr />Yse,there is a decorator end !
- </body>
- </html>
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html>/*这里导入了SiteMesh的标签库 */<%@ taglib uri="http://www.opensymphony.com/sitemesh/decorator" prefix="decorator" %><%@ taglib uri="http://www.opensymphony.com/sitemesh/page" prefix="page" %><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8">OK,there is a decorator begin!<hr /> /*这里的意思是,被装饰页的title内容将会在这里插入 */ <decorator:title></decorator:title> </head><body> /*被修饰页的body内容将在这里插入 <decorator:body></decorator:body><hr />Yse,there is a decorator end !</body></html>
1.4 被修饰页的创建
在web目录(或webContent)下创建mai.html
- <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
- <html>
- <head>
- <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
- <title>Insert title here</title>
- </head>
- <body>
- this is the Content Page !!!
- </body>
- </html>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Insert title here</title></head><body>this is the Content Page !!!</body></html>
1.5 使用tomcat进行示例运行,访问http://localhost:8080/{your project name}/mai.html , 运行结果如下:
1.6 sitemesh.xml的配置(可选, 示例中没有用到该文件)
该配置文件用于高级元素的配置,有具体需要的可以配置
- <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>
<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>
使用总结:整个过程配置是相对简单的,先导入所需资源,然后再配置filter,之后是derator page和content page的创建以及他们之间的映射关系,配置命令是相对简单的,简单的需求上面这些已经足矣。
二:使用示例
2.1 例子1
在{myapp}/WEB-INF/decorators.xml文件中添加以下decorator
- <decorator name="mydecorator1" page="mydecorator1.jsp">
- <pattern>/test1.jsp</pattern>
- </decorator>
<decorator name="mydecorator1" page="mydecorator1.jsp"> <pattern>/test1.jsp</pattern> </decorator>
在{myapp}/decorators目录下添加mydecorator1.jsp文件,内容如下:
- <%@ taglib uri="http://www.opensymphony.com/sitemesh/decorator" prefix="decorator" %>
- <html>
- <head>
- <title>My Site - <decorator:title default="Welcome!" /></title>
- <decorator:head />
- </head>
- <body>
- <decorator:body />
- <p>This message is in /decorators/mydecorator1.jsp</p>
- </body>
- </html>
<%@ taglib uri="http://www.opensymphony.com/sitemesh/decorator" prefix="decorator" %><html> <head> <title>My Site - <decorator:title default="Welcome!" /></title> <decorator:head /> </head> <body> <decorator:body /> <p>This message is in /decorators/mydecorator1.jsp</p> </body></html>
在{myapp}目录下添加test1.jsp文件,内容如下:
- <%@page contentType="text/html"%>
- <%@page pageEncoding="UTF-8"%>
- <html>
- <head>
- <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
- <title>This is test1</title>
- </head>
- <body>
- <b>This is test1</b>
- </body>
- </html>
<%@page contentType="text/html"%><%@page pageEncoding="UTF-8"%><html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>This is test1</title> </head> <body> <b>This is test1</b> </body></html>
- 打开浏览器,访问http://localhost:8080/myapp/test1.jsp,将会出现一下内容:
This is test1
This message is in /decorators/mydecorator1.jsp
2.2 例子2(decorator:getProperty)
有时候,我们期望修改页面中某个有固定标记的片段,例如我们的jsp中有一个标记<mytag>...</mytag>,此时可以用如下方法实现:
在{myapp}/WEB-INF/decorators.xml文件中添加以下decorator
- <decorator name="mydecorator2" page="mydecorator2.jsp">
- <pattern>/test2.jsp</pattern>
- </decorator>
<decorator name="mydecorator2" page="mydecorator2.jsp"> <pattern>/test2.jsp</pattern> </decorator>
在{myapp}/decorators目录下添加mydecorator2.jsp文件,内容如下:
- <%@ taglib uri="http://www.opensymphony.com/sitemesh/decorator" prefix="decorator" %>
- <html>
- <head>
- <title>My Site - <decorator:title default="Welcome!" /></title>
- <decorator:head />
- </head>
- <body>
- <decorator:body />
- <decorator:getProperty property="page.content1"/>
- <decorator:getProperty property="page.content2"/>
- <!-- do nothing -->
- <decorator:getProperty property="page.content3"/>
- <p>This message is in /decorators/mydecorator2.jsp</p>
- </body>
- </html>
<%@ taglib uri="http://www.opensymphony.com/sitemesh/decorator" prefix="decorator" %><html> <head> <title>My Site - <decorator:title default="Welcome!" /></title> <decorator:head /> </head> <body> <decorator:body /> <decorator:getProperty property="page.content1"/> <decorator:getProperty property="page.content2"/> <!-- do nothing --> <decorator:getProperty property="page.content3"/> <p>This message is in /decorators/mydecorator2.jsp</p> </body></html>
在{myapp}目录下添加test2.jsp文件,内容如下:
- <%@page contentType="text/html"%>
- <%@page pageEncoding="UTF-8"%>
- <html>
- <head>
- <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
- <title>This is test2</title>
- </head>
- <body>
- <b>This is test2</b>
- <b>Use <decorator:getProperty> tag</b>
- <content tag="content1"><p>This is content1</p></content>
- <content tag="content2"><p>This is content2</p></content>
- <content tag="content4"><p>This is content4, it shouldn't be display</p></content>
- </body>
- </html>
<%@page contentType="text/html"%><%@page pageEncoding="UTF-8"%><html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>This is test2</title> </head> <body> <b>This is test2</b> <b>Use <decorator:getProperty> tag</b> <content tag="content1"><p>This is content1</p></content> <content tag="content2"><p>This is content2</p></content> <content tag="content4"><p>This is content4, it shouldn't be display</p></content> </body></html>
打开浏览器,访问http://localhost:8080/myapp/test2.jsp,将会出现一下内容:
This is test2
Use <decorator:getProperty> tag
This is content1
This is content2
This message is in /decorators/mydecorator2.jsp
2.3 例子3 (page:applyDecorator tag)
在{myapp}/WEB-INF/decorators.xml文件中添加以下decorator:
- <decorator name="mydecorator3" page="mydecorator3.jsp">
- <pattern>/test3.jsp</pattern>
- </decorator>
- <decorator name="mydecorator31" page="mydecorator31.jsp">
- </decorator>
<decorator name="mydecorator3" page="mydecorator3.jsp"> <pattern>/test3.jsp</pattern> </decorator> <decorator name="mydecorator31" page="mydecorator31.jsp"> </decorator>
在{myapp}/decorators目录下添加mydecorator3.jsp文件,内容如下:
- <%@ taglib uri="http://www.opensymphony.com/sitemesh/decorator" prefix="decorator" %>
- <%@ taglib uri="http://www.opensymphony.com/sitemesh/page" prefix="page" %>
- <html>
- <head>
- <title>My Site - <decorator:title default="Welcome!" /></title>
- <decorator:head />
- </head>
- <body>
- <decorator:body />
- <page:applyDecorator name="mydecorator31">
- <content tag="content1"><p>This is content1</p></content>
- <content tag="content2"><p>This is content2</p></content>
- </page:applyDecorator>
- </body>
- </html>
<%@ taglib uri="http://www.opensymphony.com/sitemesh/decorator" prefix="decorator" %><%@ taglib uri="http://www.opensymphony.com/sitemesh/page" prefix="page" %><html> <head> <title>My Site - <decorator:title default="Welcome!" /></title> <decorator:head /> </head> <body> <decorator:body /> <page:applyDecorator name="mydecorator31"> <content tag="content1"><p>This is content1</p></content> <content tag="content2"><p>This is content2</p></content> </page:applyDecorator> </body></html>
在{myapp}/decorators目录下添加mydecorator31.jsp文件,内容如下:
- <%@ taglib uri="http://www.opensymphony.com/sitemesh/decorator" prefix="decorator" %>
- <%@ taglib uri="http://www.opensymphony.com/sitemesh/page" prefix="page" %>
- <p><i>begin</i></>
- <decorator:getProperty property="page.content1"/>
- <decorator:getProperty property="page.content2"/>
- <p><i>end</i></>
- 在{myapp}目录下添加test3.jsp文件,内容如下:
- <%@page contentType="text/html"%>
- <%@page pageEncoding="UTF-8"%>
- <html>
- <head>
- <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
- <title>This is test3</title>
- </head>
- <body>
- <b>This is test3</b>
- <b>Use <page:applyDecorator> tag</b>
- </body>
- </html>
<%@ taglib uri="http://www.opensymphony.com/sitemesh/decorator" prefix="decorator" %><%@ taglib uri="http://www.opensymphony.com/sitemesh/page" prefix="page" %><p><i>begin</i></><decorator:getProperty property="page.content1"/><decorator:getProperty property="page.content2"/><p><i>end</i></>在{myapp}目录下添加test3.jsp文件,内容如下:<%@page contentType="text/html"%><%@page pageEncoding="UTF-8"%><html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>This is test3</title> </head> <body> <b>This is test3</b> <b>Use <page:applyDecorator> tag</b> </body></html>
注意:相对于例子2,这里已经没有了<content tag="XXX"/>标签。
打开浏览器,访问http://localhost:8080/myapp/test3.jsp,将会出现一下内容:
This is test3
Use <page:applyDecorator> tag
begin
This is content1
This is content2
end
这里,我在mydecorator3.jsp中应用了mydecorator31.jsp的的decorator,并且将原来在test2.jsp中的 <content />标签复制到mydecorator3.jsp中,此时对于<content tag="xxx"/>的标签将会由mydecorator31.jsp了装饰。
2.4 例子4(page:parm tag)
在{myapp}/WEB-INF/decorators.xml文件中添加以下decorator:
- <decorator name="mydecorator4" page="mydecorator4.jsp">
- <pattern>/test4.jsp</pattern>
- </decorator>
- <decorator name="mydecorator41" page="mydecorator41.jsp">
- </decorator>
<decorator name="mydecorator4" page="mydecorator4.jsp"> <pattern>/test4.jsp</pattern> </decorator> <decorator name="mydecorator41" page="mydecorator41.jsp"> </decorator>
在{myapp}/decorators目录下添加mydecorator4.jsp文件,内容如下:
- <%@ taglib uri="http://www.opensymphony.com/sitemesh/decorator" prefix="decorator" %>
- <%@ taglib uri="http://www.opensymphony.com/sitemesh/page" prefix="page" %>
- <html>
- <head>
- <title>My Site - <decorator:title default="Welcome!" /></title>
- <decorator:head />
- </head>
- <body>
- <decorator:body />
- <page:applyDecorator name="mydecorator41" >
- <content tag="content1"><p>This is content1</p></content>
- <content tag="content2"><p>This is content2</p></content>
- <page:param name="page.content1"><p>This content1 has been replaced</p></page:param>
- </page:applyDecorator>
- </body>
- </html>
<%@ taglib uri="http://www.opensymphony.com/sitemesh/decorator" prefix="decorator" %><%@ taglib uri="http://www.opensymphony.com/sitemesh/page" prefix="page" %><html> <head> <title>My Site - <decorator:title default="Welcome!" /></title> <decorator:head /> </head> <body> <decorator:body /> <page:applyDecorator name="mydecorator41" > <content tag="content1"><p>This is content1</p></content> <content tag="content2"><p>This is content2</p></content> <page:param name="page.content1"><p>This content1 has been replaced</p></page:param> </page:applyDecorator> </body></html>
在{myapp}/decorators目录下添加mydecorator41.jsp文件,内容如下:
- <%@ taglib uri="http://www.opensymphony.com/sitemesh/decorator" prefix="decorator" %>
- <%@ taglib uri="http://www.opensymphony.com/sitemesh/page" prefix="page" %>
- <p><i>begin</i></>
- <decorator:getProperty property="page.content1"/>
- <decorator:getProperty property="page.content2"/>
- <p><i>end</i></>
<%@ taglib uri="http://www.opensymphony.com/sitemesh/decorator" prefix="decorator" %><%@ taglib uri="http://www.opensymphony.com/sitemesh/page" prefix="page" %><p><i>begin</i></><decorator:getProperty property="page.content1"/><decorator:getProperty property="page.content2"/><p><i>end</i></>
在{myapp}目录下添加test4.jsp文件,内容如下:
- <%@page contentType="text/html"%>
- <%@page pageEncoding="UTF-8"%>
- <html>
- <head>
- <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
- <title>This is test4</title>
- </head>
- <body>
- <b>This is test4</b>
- <b>Use <page:param> tag</b>
- </body>
- </html>
<%@page contentType="text/html"%><%@page pageEncoding="UTF-8"%><html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>This is test4</title> </head> <body> <b>This is test4</b> <b>Use <page:param> tag</b> </body></html>
打开浏览器,访问http://localhost:8080/myapp/test4.jsp,将会出现一下内容:
This is test4
Use <page:param> tag
begin
This content1 has been replaced
This is content2
end
这里,我在mydecorator4.jsp中应用了mydecorator41.jsp的的decorator,并且添加了<page:param name="page.content1">标签,那么此时页面上将会用<page:param>标签中的内容替换原来在<decorator:getProperty property="page.content1"/>中的内容,因此页面将不在“This is content1”而显示“This content1 has been replaced”
SiteMesh的一个重要特性是使用原始HTML的meta标签(例如<meta name="foo" content="bar">)从基础页面传递信息到装饰器。作为一个例子,下面我们使用一个meta标签来定义HTML页面的作者。
- < html >
- < meta name = " author " content = " test@example.com " >
- < head >
- < title > Simple Document </ title >
- </ head >
- < body >
- Hello World ! < br />
- <%= 1 + 1 %>
- </ body >
- </ html >
< html > < meta name = " author " content = " test@example.com " > < head > < title > Simple Document </ title > </ head > < body > Hello World ! < br /> <%= 1 + 1 %> </ body > </ html >
我们定义一个“smart”装饰器来研究meta标签,如果出现这个标签,则可以得到一个相应的HTML:
- <% @ taglib uri = " sitemesh-decorator " prefix = " decorator " %>
- < decorator:usePage id = " myPage " />
- < html >
- < head >
- < title >
- My Site - < decorator:title default = " Welcome! " />
- </ title >
- < decorator:head />
- </ head >
- < body >
- < h1 >< decorator:title default = " Welcome! " /></ h1 >
- < h3 >
- < a href = " mailto: <decorator:getProperty property= " meta.author " default= " staff@example.com " /> " >
- < decorator:getProperty property = " meta.author " default = " staff@example.com " />
- </ a >
- </ h3 >
- < hr />
- < decorator:body />
- < p >
- < small > ( < a href = " /?printable=true " > printable version </ a > ) </ small >
- </ p >
- </ body >
- </ html >
<% @ taglib uri = " sitemesh-decorator " prefix = " decorator " %> < decorator:usePage id = " myPage " /> < html > < head > < title > My Site - < decorator:title default = " Welcome! " /> </ title > < decorator:head /> </ head > < body > < h1 >< decorator:title default = " Welcome! " /></ h1 > < h3 > < a href = " mailto: <decorator:getProperty property= " meta.author " default= " staff@example.com " /> " > < decorator:getProperty property = " meta.author " default = " staff@example.com " /> </ a > </ h3 > < hr /> < decorator:body /> < p > < small > ( < a href = " /?printable=true " > printable version </ a > ) </ small > </ p > </ body > </ html >
可以看到我们使用了 getProperty标签的 一个默认属性——如果没有指定author,我们就设定其为staff。如果你决定使用这个模型储存页面的meta数据,你或许需要和你的开发伙伴一起来 确定将使用什么标签以及如何使用他们。简单的,你或许想要使用meta标签来描述诸如页面作者及时间戳之类的东西。更复杂一些,你或许会想像XML文件一 样标准化的管理你的站点导航,同时使用meta标签来通过页面节点转到装饰器。
sitemesh 配置
使用的sitemesh包是sitemesh-2.4.jar现将这个包加入到WEB-INF/lib下也可以加入sitemesh-page.tld , sitemesh-decorator.tld两个文件(没有也没有影响)然后在web.xml下配置拦截器代码如下
- <?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">
- <display-name></display-name>
- <welcome-file-list>
- <welcome-file>index.jsp</welcome-file>
- </welcome-file-list>
- <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>
- </web-app>
<?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"><display-name></display-name><welcome-file-list><welcome-file>index.jsp</welcome-file></welcome-file-list><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> </web-app>
定义一个decorators.xml 放在WEB-INF根目录下,配置内容提供以下示例
- <?xml version="1.0" encoding="UTF-8"?>
- <decorators defaultdir="/decorators">
- <decorator name="mai" page="mai.jsp">
- <pattern>/mai.html</pattern>
- </decorator>
- </decorators>
<?xml version="1.0" encoding="UTF-8"?><decorators defaultdir="/decorators"> <decorator name="mai" page="mai.jsp"> <pattern>/mai.html</pattern> </decorator></decorators>
在WebRoot下面新建一个decorators文件夹 然后将装饰页面放在该目录如图所示
mai.jsp.内容如下所示
- <%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>
- <%@ taglib uri="http://www.opensymphony.com/sitemesh/decorator" prefix="decorator" %>
- <%@ taglib uri="http://www.opensymphony.com/sitemesh/page" prefix="page" %>
- <%
- 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>
- <base href="<%=basePath%>">
- <title>My JSP 'mai.jsp' starting page</title>
- <meta http-equiv="pragma" content="no-cache">
- <meta http-equiv="cache-control" content="no-cache">
- <meta http-equiv="expires" content="0">
- <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
- <meta http-equiv="description" content="This is my page">
- <!--
- <link rel="stylesheet" type="text/css" href="styles.css">
- -->
- <decorator:title></decorator:title>
- </head>
- <body>
- there is a decorator begin!<hr />
- <decorator:body></decorator:body>
- hello world <hr/>
- </body>
- </html>
<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%><%@ taglib uri="http://www.opensymphony.com/sitemesh/decorator" prefix="decorator" %><%@ taglib uri="http://www.opensymphony.com/sitemesh/page" prefix="page" %><%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> <base href="<%=basePath%>"> <title>My JSP 'mai.jsp' starting page</title> <meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"><!--<link rel="stylesheet" type="text/css" href="styles.css">--> <decorator:title></decorator:title> </head> <body> there is a decorator begin!<hr /><decorator:body></decorator:body>hello world <hr/> </body></html>
引入了两个标签库<decorator:title></decorator:title>用来将被装饰页面的title放在此处。<decorator:body></decorator:body>用来将被装饰页面的body内容放在此处。
在WebRoot根目录下面新建一个mai.html 示例内容如下
- <!DOCTYPE html>
- <html>
- <head>
- <title>maqiang</title>
- <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
- <meta http-equiv="description" content="this is my page">
- <meta http-equiv="content-type" content="text/html; charset=UTF-8">
- <!--<link rel="stylesheet" type="text/css" href="./styles.css">-->
- </head>
- <body>
- This is my HTML page. <br>
- </body>
- </html>
<!DOCTYPE html><html> <head> <title>maqiang</title> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="this is my page"> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> <!--<link rel="stylesheet" type="text/css" href="./styles.css">--> </head> <body> This is my HTML page. <br> </body></html>这样就ok了
- sitemesh 了解
- SIteMesh的了解,前端渲染装饰框架
- 了解sitemesh在网站中的功能
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