The superclass "javax.servlet.http.HttpServlet" was not found on the Java Build Path

JavaWeb: 报错信息The superclass "javax.servlet.http.HttpServlet" was not found on the Java Build Path

JSP页面顶端出现“红色”的报错信息：The superclass "javax.servlet.http.HttpServlet" was not found on the Java Build Path。原来Javaweb工程类中没有添加Tomcat运行时相关类导致。

下面是具体的解决方法：

1、右击web工程-》属性或Build Path-》Java Build Path->Libraries-> Add Libray...->Server Runtime -》Tomcat Server