引入包

访问网址 https://search.maven.org/artifact/tomcat/servlet/4.1.36/N%2FA
复制依赖

<dependency>
  <groupId>tomcat</groupId>
  <artifactId>servlet</artifactId>
  <version>4.1.36</version>
  <type>N/A</type>
</dependency>

其余已经学过 ....