java.lang.NoClassDefFoundError: javax/servlet/http/HttpServletRequest

<!-- 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>

 

添加maven的配置就行了

 

https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api/3.1.0