Shiro

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import org.apache.shiro.cache.Cache;import org.apache.shiro.cache.CacheManager;import org.apache.shiro.session.Session;import org.apache.shiro.session.mgt.DefaultSessionKey;import org.apache.shiro.session.mgt.SessionManager;import org.apache.shiro.subject.Subject;import org.apache.shiro.web.filter.AccessControlFilter;import org.apache.shiro.web.util.WebUtils;import com.agood.pojo.ActiveUser;import javax.servlet.ServletRequest;import javax.servlet.ServletResponse;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import java.io.Serializable;import java.util.Deque;import java.util.LinkedList;/** *  * @Title: KickoutSessionControlFilter.java * @Package com.agood.bejavagod.controller.filter * @Description: 同一用户后登陆踢出前面的用户 * Copyright: Copyright (c) 2016 * Company:Nathan.Lee.Salvatore *  * @author leechenxiang * @date 2016年12月12日 下午7:25:40 * @version V1.0 */public class KickoutSessionControlFilter extends AccessControlFilter {    private String kickoutUrl; //踢出后到的地址    private boolean kickoutAfter = false; //踢出之前登录的/之后登录的用户 默认踢出之前登录的用户    private int maxSession = 1; //同一个帐号最大会话数 默认1    private SessionManager sessionManager;    private Cache<String, Deque<Serializable>> cache;    public void setKickoutUrl(String kickoutUrl) {        this.kickoutUrl = kickoutUrl;    }    public void setKickoutAfter(boolean kickoutAfter) {        this.kickoutAfter = kickoutAfter;    }    public void setMaxSession(int maxSession) {        this.maxSession = maxSession;    }    public void setSessionManager(SessionManager sessionManager) {        this.sessionManager = sessionManager;    }    public void setCacheManager(CacheManager cacheManager) {        this.cache = cacheManager.getCache("shiro-kickout-session");    }    @Override    protected boolean isAccessAllowed(ServletRequest request, ServletResponse response, Object mappedValue) throws Exception {        return false;    }    @Override    protected boolean onAccessDenied(ServletRequest request, ServletResponse response) throws Exception {        Subject subject = getSubject(request, response);        if(!subject.isAuthenticated() && !subject.isRemembered()) {            //如果没有登录，直接进行之后的流程            return true;        }        Session session = subject.getSession();        ActiveUser user = (ActiveUser)subject.getPrincipal();        String username = user.getUserName();        Serializable sessionId = session.getId();        // 同步控制        Deque<Serializable> deque = cache.get(username);        if(deque == null) {            deque = new LinkedList<Serializable>();            cache.put(username, deque);        }        //如果队列里没有此sessionId，且用户没有被踢出；放入队列        if(!deque.contains(sessionId) && session.getAttribute("kickout") == null) {            deque.push(sessionId);        }        //如果队列里的sessionId数超出最大会话数，开始踢人        while(deque.size() > maxSession) {            Serializable kickoutSessionId = null;            if(kickoutAfter) { //如果踢出后者                kickoutSessionId = deque.removeFirst();            } else { //否则踢出前者                kickoutSessionId = deque.removeLast();            }            try {                Session kickoutSession = sessionManager.getSession(new DefaultSessionKey(kickoutSessionId));                if(kickoutSession != null) {                    //设置会话的kickout属性表示踢出了                    kickoutSession.setAttribute("kickout", true);                }            } catch (Exception e) {//ignore exception            }        }        //如果被踢出了，直接退出，重定向到踢出后的地址        if (session.getAttribute("kickout") != null) {            //会话被踢出了            try {                subject.logout();            } catch (Exception e) { //ignore            }            saveRequest(request);                        HttpServletRequest httpRequest = WebUtils.toHttp(request);            if (ShiroFilterUtils.isAjax(httpRequest)) {                HttpServletResponse httpServletResponse = WebUtils.toHttp(response);                  httpServletResponse.sendError(ShiroFilterUtils.HTTP_STATUS_SESSION_EXPIRE);                return false;            } else {                WebUtils.issueRedirect(request, response, kickoutUrl);                return false;            }        }        return true;    }}

首先得要有个过滤器命名为：KickoutSessionControlFilter

然后在shiro.xml中需要这么定义：

<property name="filters">            <map>                <entry key="kickout" value-ref="kickoutSessionControlFilter"/>            </map>        </property>

<bean id="kickoutSessionControlFilter" class="com.agood.bejavagod.controller.filter.KickoutSessionControlFilter">          <property name="cacheManager" ref="shiroEhcacheManager"/>          <property name="sessionManager" ref="sessionManager"/>         <!-- 是否踢出后来登录的，默认是false；即后者登录的用户踢出前者登录的用户 -->         <property name="kickoutAfter" value="false"/>          <!-- 同一个用户最大的会话数，默认1；比如2的意思是同一个用户允许最多同时两个人登录 -->        <property name="maxSession" value="1"/>          <property name="kickoutUrl" value="/login.action"/>      </bean>

最后修改过滤器配置，拦截所有请求

/** = kickout,authc

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