记录在线人员信息，管理员可以踢人

listener 监听器

package com.hbsc.listener;

import com.hbsc.domain.IndexUserBo;
import com.hbsc.domain.IndexUserVo;
import com.hbsc.util.UserUtil;
import org.springframework.session.data.redis.config.annotation.web.http.EnableRedisHttpSession;
import org.springframework.stereotype.Component;

import javax.servlet.annotation.WebListener;
import javax.servlet.http.HttpSession;
import javax.servlet.http.HttpSessionEvent;
import javax.servlet.http.HttpSessionListener;
import java.util.Collections;
import java.util.Map;
import java.util.HashMap;

@Component
@WebListener
@EnableRedisHttpSession(maxInactiveIntervalInSeconds = 180)
public class OnlinePeople  implements HttpSessionListener {

    private static Map<String, HttpSession> onLines=new HashMap<>();

    public static synchronized Map<String, HttpSession> getOnLines() {
        return onLines;
    }


    @Override
    public void sessionCreated(HttpSessionEvent se) {
    }

    @Override
    public void sessionDestroyed(HttpSessionEvent se) {
      //  Map<String, HttpSession> onLines=(Map<String, HttpSession>) se.getSession().getServletContext().getAttribute("onLines");
        HttpSession session=se.getSession();
        if(OnlinePeople.getOnLines().containsKey(session.getId()))
        {
            IndexUserVo userVo=  (IndexUserVo)session.getAttribute("user");
            OnlinePeople.getOnLines().remove(session.getId());
            System.out.println("一个用户下线了....移除了："+"sessionId="+session.getId()+"And username="+ userVo.getUserName());
        }
    }
}

2.登录时录入

Map<String, HttpSession> onLines

登录代码

		OnlinePeople.getOnLines().put(request.getSession().getId(),session);

3.踢人

session.invalidate();

重点

@Component  //让spring容器管理
@WebListener//监听器注解

可以参考spring_boot实现监听器的4种方式

https://blog.csdn.net/ignorewho/article/details/80702827