新建jsp文件，The superclass "javax.servlet.http.HttpServlet" was not found on the Java Build Path错误解决方法

新建一个jsp文件后，有一个错误，The superclass "javax.servlet.http.HttpServlet" was not found on the Java Build Path

解决方法：
1. 右键项目->build path->configure build path...

2. 选择 Java build path

3. Add Library->Server Runtime->Click Next

4. 选择 Server runtime->选择Tomcat->Finish