使用sitemesh替换tiles2，spring mvc+spring web flow+sitemsh

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Sitemesh Spring MVC Spring Web Flow JPA

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：

<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 class="tundra">
<div id="wrapper">
    <div id="header">
        <div id="topbar">
            <p>
                <sec:authorize access="hasRole('ROLE_USER')">
                    <c:if test="${pageContext.request.userPrincipal != null}">
						Welcome, ${pageContext.request.userPrincipal.name} |
					</c:if>
					<a href="<c:url value="/logout" />">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="generic hotel" /></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="generic hotel" />
				</a>
            </p>
            <p class="center">
				<a href="http://www.thespringexperience.com">
					<img src="<s:url value="/resources/images/springone2gx.jpeg" />" alt="SpringOne 2GX" />
				</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="Powered by Spring" />
		</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。

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 request
java.lang.IllegalStateException: NO CONTENT
	at 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。

SpringWebFlowTutorial-useSitemesh.7z (527.3 KB)
下载次数: 143

SpringWebFlowTutorial-useTiles.7z (527.6 KB)
下载次数: 53

SpringWebFlowTutorial-sitemesh3-hasProblems.7z (528.1 KB)
下载次数: 85

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2 楼 xiaolng 2016-09-21

这个问题的解决办法如下：

将你项目的静态资源（如js,css,图片等）在sitemesh.xml配置文件内配置成exclude

如：

<mapping path="/js/*" exclude="true"/>

即可解决

1 楼 daragon 2012-06-07

引用

java.lang.IllegalStateException: NO CONTENT

这个异常的原因是sitemesh 文档里的一个拼写错误

引用

改为

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