在web.xml中实现ServletContainerInitializer的类

public class MyServletContainerInitializer implements ServletContainerInitializer {
    @Override
    public void onStartup(Set<Class<?>> c, ServletContext ctx) throws ServletException {
        // 在这里执行初始化任务
    }
}

<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
         http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
         version="4.0">

   <absolute-ordering>
        <others/>
       <listener>
           <listener-class>com.example.MyServletContainerInitializer</listener-class>
        </listener>
    </absolute-ordering>

    <!-- 其他配置 -->

</web-app>