Shiro - 限制并发人数登录与剔除

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原文地址：https://www.cnblogs.com/leechenxiang/p/6171151.html


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>