方式一：右键项目 选择 properties 添加运行时环境即可
方式二:如果是maven项目：
可以在pom.xml中加入
1 <dependency> 2 <groupId>javax.servlet</groupId> 3 <artifactId>servlet-api</artifactId> 4 <version>2.5</version> 5 <scope>provided</scope> 6 </dependency>
jsp 报错 The superclass "jakarta.servlet.http.HttpServlet" was not found on the Java Build Path
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