配置 ServletContext 生死监听器

package com.servlet;

import java.io.IOException;
import java.util.Date;

import javax.servlet.ServletContext;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * ServletContext生死监听器
 */
//@WebServlet("/SecondServlet")
public class ServletListner implements ServletContextListener {

    /**
     * ServletContext域创建时立即执行contextInitialized方法
     */
    @Override
    public void contextInitialized(ServletContextEvent sce) {
        //获取servletContext域
        ServletContext servletContext = sce.getServletContext();
        //获取虚拟路径
        String contextPath = servletContext.getContextPath();
        //将路径存入域中
        servletContext.setAttribute("path", contextPath);
    }
    @Override
    public void contextDestroyed(ServletContextEvent sce) {
        // TODO Auto-generated method stub
        
    }

}

  <listener>
      <listener-class>com.servlet.ServletListner</listener-class>
  </listener>