<listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<servlet>
    <servlet-name>context</servlet-name>
    <servlet-class>org.springframework.web.context.ContextLoaderServlet</servlet-class>
    <load-on-startup>1</load-on-startup>
</servlet> 
<servlet>
<servlet-name>SpringMVC</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>  
        <param-name>contextConfigLocation</param-name>  
        <param-value>classpath:spring/applicationContext-servlet.xml</param-value>
        <load-on-startup>1</load-on-startup>
    </init-param>
</servlet>
 

web.xml配置資訊（舉例），以下是我獲取bean的方法

ApplicationContext context = WebApplicationContextUtils.getWebApplicationContext(request.getServletContext());
		DialManageService dialManageService = (DialManageService)context.getBean("DialManageService");

2016-07-08 14:07:12,328 ERROR [http-bio-8080-exec-5] ManageToolsController - --dialTest error --
org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'DialManageService' is defined
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeanDefinition(DefaultListableBeanFactory.java:698)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getMergedLocalBeanDefinition(AbstractBeanFactory.java:1174)
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:283)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:196)
	at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1045)
	
 

http://bbs.csdn.net/topics/390977647

原來springMvc和spring上下文不是同一個，spring是用listener初始化的上下文，稱為root上下文，springMvc是通過servlet初始化的上下文，稱為servlet上下文，servlet裡的能獲取root裡的，反之就獲取不到，servlet應該是root的子上下文，而我獲取bean的地方是處於root上下文的，怎麼才能通過程式碼獲取servlet的上下文呢？帖子裡給我滿意的答案，於是我修改程式碼如下

			ApplicationContext context = WebApplicationContextUtils.getWebApplicationContext(request.getServletContext(),

"org.springframework.web.servlet.FrameworkServlet.CONTEXT.SpringMVC");
			DialManageService dialManageService = (DialManageService)context.getBean("DialManageService");

WebApplicationContextUtils.getWebApplicationContext（）方法的第二個引數，其中SpringMVC是servlet上下文配置的servlet名字，這樣獲取到的上下文就是servlet上下文，這樣就能成功獲取到這個bean，如果現在用這個context獲取root上下文的bean就獲取不到了，很有用，記錄下