项目出现 The superclass "javax.servlet.http.HttpServlet" was not found on the Java Build Path 解决方法

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

①项目右击-->build path -->添加libraries-->server runtime-->ok

项目出现 The superclass "javax.servlet.http.HttpServlet" was not found on the Java Build Path 解决方法

项目出现 The superclass "javax.servlet.http.HttpServlet" was not found on the Java Build Path 解决方法