web.xml配置servlet
<web-app>
<display-name>Archetype Created Web Application</display-name>
<servlet>
<servlet-name>demo13</servlet-name>
<servlet-class>com.itheima.web.ServletDemo13</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>demo13</servlet-name>
<url-pattern>/demo13</url-pattern>
</servlet-mapping>
</web-app>