JavaWeb:报错信息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 再导入外部的web项目之后报错: The superclass “javax.servlet.http.HttpServlet” was not found on the Java Build Path。
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