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public class FirstListen implements ServletContextListener{ @Override public void contextDestroyed(ServletContextEvent sce) { } @Override public void contextInitialized(ServletContextEvent sce) { }}@SpringBootApplicationpublic class Demo

public class FirstServlet extends HttpServlet{ @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { System.out.println("successful"); }}//通过方法引用servlet@SpringBootApplicationpubl

//spring的<parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.3.3.RELEASE</version></parent> //JDK版本 <properties> <java.vers