使用sitemesh替换tiles2，spring mvc+spring web flow+sitemsh
?? 之前改写的spring web flow发行包中的booking-mvc应用(参见http://clongjava.iteye.com/blog/1314108)，采用的是tiles2来统一整个站点页面风格，spring web flow提供了一个ViewResolver为org.springframework.js.ajax.AjaxUrlBasedViewResolver，它结合了spring-js，提供了ajax内置的支持，可以使我们局部加载某个tiles的put-attribute中的内容。可是每次都要写tiles配置文件，感觉不爽，由于之前使用过sitemesh感觉不错，就想替换掉tiles，由于tiles和sitemesh采用统一页面风格的理念不一样，sitemesh采用的是装饰(decorator)通过filter来过滤所有请求生成的页面。而tiles是采用的模板方法。二者目的都是一样的，统一风格。
?????? sitemesh配置很简单：首先在web.xml中添加一个sitemesh filter,代码如下：
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<filter> <filter-name>sitemesh</filter-name> <filter-class>com.opensymphony.sitemesh.webapp.SiteMeshFilter</filter-class> </filter><!-- note:sitemesh filter mapping must appear after springSecurityFilterChain filter mapping --> <filter-mapping> <filter-name>sitemesh</filter-name> <url-pattern>/*</url-pattern> </filter-mapping>
?这里有个注意点要提下：当我们也配置了spring security filter的时候，sitemesh的filter mapping应该在spring security filter mapping之后，不然sitemesh对于使用spring security jsp tag的页面显示不出来，这也可以理解，sitemesh已经装饰完成了，而spring security filter还没结束，当然显示不出来。
第二步，在WEB-INF目录下，新建一个名为decorators.xml文件即可，内容如下：
<?xml version="1.0" encoding="UTF-8" ?><decorators defaultDir="/WEB-INF/layout"> <excludes> <pattern>/resources/*</pattern> </excludes> <decorator name="main" page="main.jsp"> <pattern>/*</pattern> </decorator></decorators>
?第三步，开始编写我们的装饰者页面，这里展示一下我的页面：
<%@ page contentType="text/html;charset=UTF-8" language="java" pageEncoding="UTF-8" %><%@ taglib prefix="s" uri="http://www.springframework.org/tags" %><%@ taglib prefix="decorator" uri="http://www.opensymphony.com/sitemesh/decorator" %><%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %><%@ taglib prefix="sec" uri="http://www.springframework.org/security/tags" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN""http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/> <title><decorator:title default="Spring Travel: Spring MVC and Web Flow Reference Application" /></title> <link type="text/css" rel="stylesheet" href="<c:url value="/resources/dijit/themes/tundra/tundra.css" />" /> <link rel="stylesheet" type="text/css" href="<s:url value="/resources/css/main.css" />" /> <!--[if lte IE 6]> <link rel="stylesheet" type="text/css" href="<s:url value="/resources/css/ie6.css" />" /> <![endif]--> <script type="text/javascript" src="<c:url value="/resources/dojo/dojo.js" />"></script> <script type="text/javascript" src="<c:url value="/resources/spring/Spring.js" />"></script> <script type="text/javascript" src="<c:url value="/resources/spring/Spring-Dojo.js" />"></script> <script type="text/javascript" src="<s:url value="/resources/js/jquery-1.7.1.min.js" />"></script> <script type="text/javascript" src="<s:url value="/resources/js/jquery.validate.min.js" />"></script> <decorator:head /></head><body />">Logout</a> | <a href="<c:url value="/sec/users/changePassword" />">Change Password</a> </sec:authorize> <sec:authorize access="anonymous"> <a href="<c:url value="/login" />">Login</a> </sec:authorize> </p> </div> <div id="logo"> <p> <a href="<s:url value="/" />"><img src="<s:url value="/resources/images/header.jpg" />" alt="应用sitemesh替换tiles2，spring mvc+spring web flow+sitemsh" /></a> </p> </div> </div> <div id="content"> <div id="primary"> <decorator:body /> </div> <div id="secondary"> <p> <a href="http://www.thespringexperience.com"><img src="<s:url value="/resources/images/myDog.jpg" />" width="208px" height="300px" alt="应用sitemesh替换tiles2，spring mvc+spring web flow+sitemsh" /></a> </p> <p />" alt="应用sitemesh替换tiles2，spring mvc+spring web flow+sitemsh" /></a></p> </div> </div> <div id="footer"> <a href="http://www.springframework.org"><img src="<s:url value="/resources/images/powered-by-spring.png" />" alt="应用sitemesh替换tiles2，spring mvc+spring web flow+sitemsh" /></a> </div></div></body></html>
?这里充分显示你的前端水平，规划好整个风格后，后面开发起来就轻松多了。
传几张图片看看效果图吧，图中的dog是我养的，非常棒。
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??????????? 本来打算使用sitemesh3的，它里面有些新的东西，对返回的MIME不是text/html的响应也能进行装饰，可是发现sitemesh3有一个问题，当第一次访问页面的时候没有问题，可是一刷新页面就会出现页面加载缓慢，并抛出一个异常，异常如下：
[DEBUG,FlowHandlerMapping,qtp1056001-20 - /SpringWebFlowTutorial/resources/js/jquery.validate.min.js] No flow mapping found for request with URI '/SpringWebFlowTutorial/resources/js/jquery.validate.min.js'[DEBUG,RequestMappingHandlerMapping,qtp1056001-20 - /SpringWebFlowTutorial/resources/js/jquery.validate.min.js] Looking up handler method for path /resources/js/jquery.validate.min.js[DEBUG,DispatcherServlet,qtp1056001-24 - /SpringWebFlowTutorial/resources/js/jquery-1.7.1.min.js] Could not complete requestjava.lang.IllegalStateException: NO CONTENTat org.eclipse.jetty.http.HttpGenerator.addContent(HttpGenerator.java:156)at org.eclipse.jetty.server.HttpOutput.write(HttpOutput.java:167)at org.eclipse.jetty.server.HttpOutput.write(HttpOutput.java:101)at org.sitemesh.webapp.contentfilter.io.RoutableServletOutputStream.write(RoutableServletOutputStream.java:133)at org.springframework.util.FileCopyUtils.copy(FileCopyUtils.java:113)at org.springframework.web.servlet.resource.ResourceHttpRequestHandler.writeContent(ResourceHttpRequestHandler.java:240)at org.springframework.web.servlet.resource.ResourceHttpRequestHandler.handleRequest(ResourceHttpRequestHandler.java:141)at org.springframework.web.servlet.mvc.HttpRequestHandlerAdapter.handle(HttpRequestHandlerAdapter.java:49)at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:900)at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:827)at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882)at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:778)at javax.servlet.http.HttpServlet.service(HttpServlet.java:705)at javax.servlet.http.HttpServlet.service(HttpServlet.java:814)at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:547)at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1359)at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:77)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1330)at org.sitemesh.webapp.contentfilter.ContentBufferingFilter.bufferAndPostProcess(ContentBufferingFilter.java:169)at org.sitemesh.webapp.contentfilter.ContentBufferingFilter.doFilter(ContentBufferingFilter.java:126)at org.sitemesh.config.ConfigurableSiteMeshFilter.doFilter(ConfigurableSiteMeshFilter.java:163)at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1330)at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:167)at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:259)at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1330)at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:478)at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:119)at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:520)at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:227)at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:941)at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:409)at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:186)at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:875)at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:117)at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:250)at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:149)at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:110)at org.eclipse.jetty.server.Server.handle(Server.java:345)at org.eclipse.jetty.server.HttpConnection.handleRequest(HttpConnection.java:441)at org.eclipse.jetty.server.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:919)at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:582)at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:218)at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:51)at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:586)at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:44)at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:598)at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:533)at java.lang.Thread.run(Thread.java:662)
?这个只有在刷新当前页面的时候才会出现，我想就是在加载静态资源文件时会出错，可能是sitemesh3的一个bug，毕竟sitemesh3还是alpha版本，不知道有没有高人遇到过这个问题，帮小弟解答一下。
sitemesh3配置更简单，只需在WEB-INF下放置sitemesh3.xml即可。
<?xml version="1.0" encoding="UTF-8"?><sitemesh> <!-- Map default decorator. This shall be applied to all paths if no other paths match. --> <mapping path="/*" decorator="/WEB-INF/layout/main.jsp" exclue="false"/> <!-- Exclude path from decoration. --> <mapping path="/resources/*" exclue="true"/></sitemesh>
?web.xml过滤器配置如下：
<filter> <filter-name>sitemesh</filter-name> <filter-class>org.sitemesh.config.ConfigurableSiteMeshFilter</filter-class> </filter> <filter-mapping> <filter-name>sitemesh</filter-name> <url-pattern>/*</url-pattern> </filter-mapping>
当然了应该把sitemesh3的maven依赖加进去。pom.xml
<dependency> <groupId>org.sitemesh</groupId> <artifactId>sitemesh</artifactId> <version>3.0-alpha-2</version></dependency>
?对于使用maven作为项目管理工具的，应该拥有自己的一台私服，比如nexus，这样构件搜索起来比较快速,便于管理。
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