Maven項目下HttpServletRequest 或 HttpServletResponse顯示紅色

用Idea軟體，Maven項目下HttpServletRequest 或 HttpServletResponse顯示紅色，需引用的依賴包:servlet-api.jar，官網上對應的是：JavaServlet(TM) Specification，連結 http://mvnrepository.com/artifact/javax.servlet/servlet-api

<!-- https://mvnrepository.com/artifact/javax.servlet/servlet-api -->

<dependency>

    <groupId>javax.servlet</groupId>

    <artifactId>servlet-api</artifactId>

    <version>2.5</version>

    <scope>provided</scope>

</dependency>