<?xml?version="1.0"?encoding="UTF-8"?>
<web-app?version="2.4"?xmlns="http://java.sun.com/xml/ns/j2ee"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee?
	http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
??<display-name>Spring?MVC?Study</display-name>
??
????<!--?Spring應用上下文，?理解層次化的ApplicationContext?-->
??<context-param>
?		<param-name>contextConfigLocation</param-name>
		<param-value>/WEB-INF/configs/spring/applicationContext*.xml</param-value>
??</context-param>
??
??<listener>
		<listener-class>
			org.springframework.web.context.ContextLoaderListener
		</listener-class>
??</listener>
??
????<!--?DispatcherServlet,?Spring?MVC的核心?-->
<servlet>
????<servlet-name>mvc-dispatcher</servlet-name>
????<servlet-class>?org.springframework.web.servlet.DispatcherServlet</servlet-class>
????<!--?DispatcherServlet對應的上下文配置，?默認為/WEB-INF/$servlet-name$-servlet.xml?-->
		<init-param>
		????<param-name>contextConfigLocation</param-name>
		????<param-value>/WEB-INF/configs/spring/mvc-dispatcher-servlet.xml</param-value>
		</init-param>
		<load-on-startup>1</load-on-startup>
</servlet>

<servlet-mapping>
????<servlet-name>mvc-dispatcher</servlet-name>
????<!--?mvc-dispatcher攔截所有的請求-->
????<url-pattern>/</url-pattern>
</servlet-mapping>
??
</web-app>

上面的listener-class和servlet-class的值，我們在剛配置時時通過什么途徑獲取的呢？