tomcat服务启动与停止的监听

1：首先需要导入的包

2：在web.xml中添加监听

3：

ServletContextListener监听ServletContext。当创建ServletContext时，激发 contextInitialized(ServletContextEvent sce)方法；当销毁ServletContext时，激发contextDestroyed(ServletContextEvent sce)方法。
用这个监听器，tomcat启动和停止前你想干什么干什么

package com.eoopen.listener;

import java.util.List;

import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;

import org.jivesoftware.smack.XMPPConnection;
import org.jivesoftware.smack.XMPPException;
import org.springframework.data.redis.core.RedisTemplate;

import com.eoopen.util.Constant;
import com.eoopen.util.ContextUtil;
import com.eoopen.util.XMPPConnectionUtils;
import com.eoopen.xmpp.loginin.ClientUser;
import com.eoopen.xmpp.loginin.ClientUserService;
import com.eoopen.xmpp.loginin.OfUser;

public class InitServletContextListener implements ServletContextListener{

    public void contextInitialized(ServletContextEvent sce) {
        System.out.println("-------------------------contextInitialized");
        try {
            //创建openfire连接，账号登陆
            XMPPConnection connection = XMPPConnectionUtils.getConnection();
            connection.login(XMPPConnectionUtils.NAME, XMPPConnectionUtils.PASSWORD);
            //初始化openfire后台登陆的sessionId
            XMPPConnectionUtils.loginBackstage();

            //初始化用户缓存队列
            initUserCacheQueue();

        } catch (XMPPException e) {
            System.out.println("------------------------------服务器初始化登陆openfire服务器失败");
            e.printStackTrace();
        }
    }

    public void contextDestroyed(ServletContextEvent sce) {
        System.out.println("--------------------------contextDestroyed");
        XMPPConnectionUtils.closeConnection();

    }

}