<!-- 1.引入依赖 -->
<!-- https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api -->
<dependency>
    <groupId>javax.servlet</groupId>
    <artifactId>javax.servlet-api</artifactId>
    <version>3.1.0</version>
    <scope>provided</scope>
</dependency>

<!-- 2.pom中打包方式packging选择jar -->
<modelVersion>4.0.0</modelVersion>
<groupId>com.bingo</groupId>
<artifactId>ssm</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>jar</packaging>

<!-- 3. 执行mvn clean、mvn install -->