XMl中加了这个Servlet的配置就无法启动了》》》》》

<servlet>
      <servlet-name>AsynServlet</servlet-name>
      <servlet-class>com.servlet.AsynServlet</servlet-class>
  </servlet>
  
  <servlet-mapping>
      <servlet-name>AsynServlet</servlet-name>
      <!-- 配置浏览器访问Servlet地址 -->
    <url-pattern>/AsynServlet</url-pattern>
  </servlet-mapping>