DispatcherServlet在springmvc中的作用是什么

  <!-- springMVC核心配置 -->  <servlet>    <servlet-name>springmvcServlet</servlet-name>    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>    <init-param>      <param-name>contextConfigLocation</param-name>      <!--spingMVC的配置路径 -->      <param-value>classpath:springmvc/spring-mvc.xml</param-value>    </init-param>    <load-on-startup>1</load-on-startup>  </servlet>  <servlet-mapping>    <servlet-name>springmvcServlet</servlet-name>    <url-pattern>*.html</url-pattern>  </servlet-mapping>