blocks|key|185070|text|首先为你喜欢的东西创建一个单例，我只是设置了一个字符串，但是任何类都可以工作：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|185071|public+class+MySiteEnvironment+{

++++private+String+someConfigurationParameter;

++++public+String+getSomeConfigurationParameter()+{
++++++++return+someConfigurationParameter;
++++}

++++public+void+setSomeConfigurationParameter(String+someConfigurationParameter)+{
++++++++this.someConfigurationParameter+=+someConfigurationParameter;
++++}

++++/*+SINGLETON+*/
++++private+static+final+MySiteEnvironment+INSTANCE+=+new+MySiteEnvironment();

++++private+MySiteEnvironment()+{
++++}

++++public+static+MySiteEnvironment+getInstance()+{
++++++++return+INSTANCE;
++++}
}|code-block|syntax|javascript|185072|接下来，您需要注入值：|185073|<bean+id="mySiteEnvironment"+class="MySiteEnvironment"+factory-method="getInstance">
++++++++<property+name="someConfigurationParameter"+value="myValueOrBean"/>
++++</bean>|185074|最后，您可以通过以下方式访问它：|185075|<%25@+page+import="MySiteEnvironment"+%25>
<%25+pageContext.setAttribute("env",+MySiteEnvironment.getInstance());+%25>+|185076|现在，您可以使用表达式语言来访问环境|185077|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|W|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|Y|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

Start by creating a singleton for whatever you fancy, I am just setting a String, but any Class will work:

<pre><code>public class MySiteEnvironment {

 private String someConfigurationParameter;

 public String getSomeConfigurationParameter() {
 return someConfigurationParameter;
 }

 public void setSomeConfigurationParameter(String someConfigurationParameter) {
 this.someConfigurationParameter = someConfigurationParameter;
 }

 /* SINGLETON */
 private static final MySiteEnvironment INSTANCE = new MySiteEnvironment();

 private MySiteEnvironment() {
 }

 public static MySiteEnvironment getInstance() {
 return INSTANCE;
 }
}
</code></pre>

Next you need to inject the value:

<pre><code>&lt;bean id="mySiteEnvironment" class="MySiteEnvironment" factory-method="getInstance"&gt;
 &lt;property name="someConfigurationParameter" value="myValueOrBean"/&gt;
 &lt;/bean&gt;
</code></pre>

Finally you access it by:

<pre><code>&lt;%@ page import="MySiteEnvironment" %&gt;
&lt;% pageContext.setAttribute("env", MySiteEnvironment.getInstance()); %&gt; 
</code></pre>

Now you can use expression language to access the environment

blocks|key|685292|text|我不知道有什么方法可以做到你所要求的，但也有另一种选择。您可以在控制器方法参数中声明HttpServletRequest。如果Sitemesh需要使用模型对象，只需将它们放在请求上即可。无论后台上下文是servlet请求还是Spring+MVC模型，JSP代码看起来都是一样的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|685293|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I'm not aware of a way to do what you're asking, but there's another alternative as well. You can declare the HttpServletRequest in your controller method parameters. Just put the model objects on the request if they need to be available to Sitemesh. The JSP code looks exacty the same whether the backing context is the servlet request or the Spring MVC model.

blocks|key|3965676|text|我也有同样的问题，并通过使用过滤器解决了我的问题。我创建了一个环境过滤器，可以用来为所有请求设置环境数据。自动连接您需要在过滤器中拥有访问权限的bean。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3965677|@Component
public+class+EnvironmentFilter+extends+OncePerRequestFilter+{

++++@Autowired
++++Object+bean;

++++@Override
++++protected+void+doFilterInternal(HttpServletRequest+request,+HttpServletResponse+response,+FilterChain+filterChain)+throws+ServletException,+IOException+{

++++++++request.setAttribute("bean",+bean);+//+add+bean+or+just+specific+properties+of+bean.

++++++++filterChain.doFilter(request,+response);

++++}

}|code-block|syntax|javascript|3965678|在web.xml中配置过滤器，确保过滤器映射使用与Sitemesh过滤器相同的模式。|3965679|<filter>
++++<filter-name>environmentFilter</filter-name>
++++<filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
</filter>

<filter-mapping>
++++<filter-name>environmentFilter</filter-name>
++++<url-pattern>/*</url-pattern>
</filter-mapping>|3965680|过滤器中设置的属性现在可以在装饰器页面中使用。|3965681|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

I had the same issue and solved my problem by using a filter. I created an environment filter that I could use for setting environment data for all requests. Autowire the bean you need to have access too in the filter.

<pre><code>@Component
public class EnvironmentFilter extends OncePerRequestFilter {

 @Autowired
 Object bean;

 @Override
 protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException {

 request.setAttribute("bean", bean); // add bean or just specific properties of bean.

 filterChain.doFilter(request, response);

 }

}
</code></pre>

Configure the filter in web.xml, be sure to use the same pattern for the filter mapping as you have for Sitemesh filter.

<pre><code>&lt;filter&gt;
 &lt;filter-name&gt;environmentFilter&lt;/filter-name&gt;
 &lt;filter-class&gt;org.springframework.web.filter.DelegatingFilterProxy&lt;/filter-class&gt;
&lt;/filter&gt;

&lt;filter-mapping&gt;
 &lt;filter-name&gt;environmentFilter&lt;/filter-name&gt;
 &lt;url-pattern&gt;/*&lt;/url-pattern&gt;
&lt;/filter-mapping&gt;
</code></pre>

The attributes set from your filter are now available from your decorator page.

blocks|key|3965685|text|我重新实现了sitemesh过滤器，解决了这个问题：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3965686|@Component
class+SitemeshSpringFilter+extends+PageFilter+implements+ApplicationContextAware+{
++++ApplicationContext+applicationContext;

++++@Override
++++public+void+doFilter(ServletRequest+rq,+ServletResponse+rs,
++++++++++++FilterChain+chain)+throws+IOException,+ServletException+{
++++++++def+newRq+=+new+ContextExposingHttpServletRequest(
++++++++++++++++rq,+getApplicationContext(),+null);

++++++++super.doFilter(newRq,+rs,+chain);
++++}

++++@Override
++++public+void+setApplicationContext(ApplicationContext+applicationContext)
++++throws+BeansException+{
++++++++this.applicationContext+=+applicationContext;
++++}
}|code-block|syntax|javascript|3965687|在web.xml中，声明此过滤器：|3965688|<filter>
++++<filter-name>sitemeshSpringFilter</filter-name>
++++<filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
++++<init-param>
++++++++<param-name>targetFilterLifecycle</param-name>
++++++++<param-value>true</param-value>
++++</init-param>
</filter>
<filter-mapping>
++++<filter-name>sitemeshSpringFilter</filter-name>
++++<url-pattern>/*</url-pattern>
</filter-mapping>|3965689|现在，sitemesh过滤器将使用ContextExposingHttpServletRequest代替普通请求。|3965690|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

I resolved this problem reimplementing the sitemesh filter:

<pre><code>@Component
class SitemeshSpringFilter extends PageFilter implements ApplicationContextAware {
 ApplicationContext applicationContext;

 @Override
 public void doFilter(ServletRequest rq, ServletResponse rs,
 FilterChain chain) throws IOException, ServletException {
 def newRq = new ContextExposingHttpServletRequest(
 rq, getApplicationContext(), null);

 super.doFilter(newRq, rs, chain);
 }

 @Override
 public void setApplicationContext(ApplicationContext applicationContext)
 throws BeansException {
 this.applicationContext = applicationContext;
 }
}
</code></pre>

In the web.xml, declare this filter:

<pre><code>&lt;filter&gt;
 &lt;filter-name&gt;sitemeshSpringFilter&lt;/filter-name&gt;
 &lt;filter-class&gt;org.springframework.web.filter.DelegatingFilterProxy&lt;/filter-class&gt;
 &lt;init-param&gt;
 &lt;param-name&gt;targetFilterLifecycle&lt;/param-name&gt;
 &lt;param-value&gt;true&lt;/param-value&gt;
 &lt;/init-param&gt;
&lt;/filter&gt;
&lt;filter-mapping&gt;
 &lt;filter-name&gt;sitemeshSpringFilter&lt;/filter-name&gt;
 &lt;url-pattern&gt;/*&lt;/url-pattern&gt;
&lt;/filter-mapping&gt;
</code></pre>

Now, the sitemesh filter will use ContextExposingHttpServletRequest instead normal request.

I am using Spring 3 with sitemesh. I would like to refer to spring context bean in decorator page defined in sitemesh.

The problem is that SiteMesh filter is working outside the Spring context, so request object on sitemesh decorator jsp page is native HttpServletRequest and not wrapper with useful functions to access context and etc.

Is there a way to somehow configure both spring and sitemesh to have access to Spring context in decorator page?

How to obtain model attribute or spring's bean in sitemesh decorator?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我使用的是Spring3和sitemesh。我想引用sitemesh中定义的装饰器页面中的spring上下文bean。问题是SiteMesh过滤器在Spring上下文之外工作，所以sitemesh修饰器jsp页面上的请求对象是本机HttpServletRequest，而不是具有访问上下文等有用函数的包装器。有没有办法同...

问如何在sitemesh装饰器中获取模型属性或spring的bean？
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问如何在sitemesh装饰器中获取模型属性或spring的bean？EN