<pluginManagement>
     <plugins>
       <plugin>
         <groupId>org.apache.tomcat.maven</groupId>
         <artifactId>tomcat6-maven-plugin</artifactId>
         <version>2.2</version>
       </plugin>
       <plugin>
         <groupId>org.apache.tomcat.maven</groupId>
         <artifactId>tomcat7-maven-plugin</artifactId>
         <version>2.2</version>
       </plugin>
     </plugins>
   </pluginManagement>

<!-- https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api -->
<dependency>
 <groupId>javax.servlet</groupId>
 <artifactId>javax.servlet-api</artifactId>
 <version>4.0.1</version>
 <scope>provided</scope>
</dependency>
<!-- https://mvnrepository.com/artifact/javax.servlet.jsp/javax.servlet.jsp-api -->
<dependency>
 <groupId>javax.servlet.jsp</groupId>
 <artifactId>javax.servlet.jsp-api</artifactId>
 <version>2.3.3</version>
 <scope>provided</scope>
</dependency>

去到maven的官网，左侧导航栏找到plugins - ctrl + f搜到 tomcat,点击进去，找到tomcat的插件，把插件贴到pom.xml中

引入插件这一块看一下

依赖 & 插件