好久不写Jsp，今天建立了一个Javaweb工程，并在eclipse中配置了Web容器Tomcat。原本开心的新建jsp页面，添加一个简单的Java类。可是，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
2、切换到Java Build Path界面中的Orader and Export，选择Tomcat。
order就是使用class的顺序(因为可能出现class同名的情况)
export就是把用到的一些的lib和project同时发布.
export就是把用到的一些的lib和project同时发布.
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