2020.05.03 Listener监听器

Posted 2020-11-27 aojie

package com.aojie.web.listener;

import javax.servlet.ServletContext;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import javax.servlet.annotation.WebListener;
import java.io.FileInputStream;
import java.io.FileNotFoundException;

/**
 * @author aojie
 * @fuction
 * @create 2020-05-03 20:07
 */
@WebListener
public class ContextLoaderListener implements ServletContextListener {
    /**
     * 服务器启动后自动调用
     * @param servletContextEvent
     */
    @Override
    public void contextInitialized(ServletContextEvent servletContextEvent) {
        //加载资源文件
        //1.获取ServletContext对象
        ServletContext servletContext = servletContextEvent.getServletContext();
        //2.加载资源文件
        String contextConfigLocation = servletContext.getInitParameter("contextConfigLocation");
        //获取真实路径
        String realPath = servletContext.getRealPath(contextConfigLocation);
        //加载进内存
        try {
            FileInputStream fileInputStream = new FileInputStream(realPath);
            System.out.println(fileInputStream);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        System.out.println("ServletContext对象被创建了");
    }

    /**
     * 服务器正常关闭后该方法调用
     * @param servletContextEvent
     */
    @Override
    public void contextDestroyed(ServletContextEvent servletContextEvent) {
        System.out.println("ServletContext对象被销毁了");
    }
}