JSP页面出现The superclass ＂javax.servlet.http.HttpServlet＂ was not found on the Java Build Pa

GITHUB上下载的Java Web项目，导入Eclipse后报错The superclass "javax.servlet.http.HttpServlet" was not found on the Java Build Path

解决办法：

1、右键项目工程 -> Build Path -> Configure Build Path…

2、Add Library…

3、Server Runtime -> Next

4、选择Tomcat

5、点击Apply -> OK

错误消失~