Shiro - 限制并发人数登录与剔除

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; } }

<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>

/** = kickout,authc