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+package com.ruoyi.framework.shiro.web.filter.kickout;
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+
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+import java.io.IOException;
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+import java.io.Serializable;
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+import java.util.ArrayDeque;
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+import java.util.Deque;
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+import javax.servlet.ServletRequest;
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+import javax.servlet.ServletResponse;
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+import javax.servlet.http.HttpServletRequest;
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+import javax.servlet.http.HttpServletResponse;
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+import org.apache.shiro.cache.Cache;
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+import org.apache.shiro.cache.CacheManager;
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+import org.apache.shiro.session.Session;
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+import org.apache.shiro.session.mgt.DefaultSessionKey;
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+import org.apache.shiro.session.mgt.SessionManager;
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+import org.apache.shiro.subject.Subject;
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+import org.apache.shiro.web.filter.AccessControlFilter;
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+import org.apache.shiro.web.util.WebUtils;
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+import com.fasterxml.jackson.databind.ObjectMapper;
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+import com.ruoyi.common.core.domain.AjaxResult;
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+import com.ruoyi.common.utils.ServletUtils;
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+import com.ruoyi.framework.util.ShiroUtils;
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+import com.ruoyi.system.domain.SysUser;
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+
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+/**
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+ * 登录帐号控制过滤器
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+ *
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+ * @author ruoyi
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+ */
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+public class KickoutSessionFilter extends AccessControlFilter
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+{
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+ private final static ObjectMapper objectMapper = new ObjectMapper();
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+
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+ /**
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+ * 同一个用户最大会话数
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+ **/
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+ private int maxSession = -1;
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+
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+ /**
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+ * 踢出之前登录的/之后登录的用户 默认false踢出之前登录的用户
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+ **/
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+ private Boolean kickoutAfter = false;
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+
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+ /**
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+ * 踢出后到的地址
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+ **/
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+ private String kickoutUrl;
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+
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+ private SessionManager sessionManager;
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+ private Cache<String, Deque<Serializable>> cache;
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+
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+ @Override
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+ protected boolean isAccessAllowed(ServletRequest servletRequest, ServletResponse servletResponse, Object o)
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+ throws Exception
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+ {
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+ return false;
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+ }
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+
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+ @Override
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+ protected boolean onAccessDenied(ServletRequest request, ServletResponse response) throws Exception
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+ {
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+ Subject subject = getSubject(request, response);
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+ if (!subject.isAuthenticated() && !subject.isRemembered() || maxSession == -1)
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+ {
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+ // 如果没有登录或用户最大会话数为-1，直接进行之后的流程
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+ return true;
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+ }
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+ try
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+ {
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+ Session session = subject.getSession();
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+ // 当前登录用户
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+ SysUser user = ShiroUtils.getSysUser();
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+ String loginName = user.getLoginName();
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+ Serializable sessionId = session.getId();
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+
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+ // 读取缓存用户 没有就存入
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+ Deque<Serializable> deque = cache.get(loginName);
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+ if (deque == null)
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+ {
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+ // 初始化队列
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+ deque = new ArrayDeque<Serializable>();
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+ }
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+
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+ // 如果队列里没有此sessionId，且用户没有被踢出；放入队列
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+ if (!deque.contains(sessionId) && session.getAttribute("kickout") == null)
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+ {
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+ // 将sessionId存入队列
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+ deque.push(sessionId);
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+ // 将用户的sessionId队列缓存
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+ cache.put(loginName, deque);
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+ }
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+
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+ // 如果队列里的sessionId数超出最大会话数，开始踢人
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+ while (deque.size() > maxSession)
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+ {
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+ Serializable kickoutSessionId = null;
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+ // 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；
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+ if (kickoutAfter)
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+ {
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+ // 踢出后者
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+ kickoutSessionId = deque.removeFirst();
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+ }
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+ else
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+ {
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+ // 踢出前者
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+ kickoutSessionId = deque.removeLast();
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+ }
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+ // 踢出后再更新下缓存队列
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+ cache.put(loginName, deque);
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+
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+ // 获取被踢出的sessionId的session对象
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+ Session kickoutSession = sessionManager.getSession(new DefaultSessionKey(kickoutSessionId));
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+ if (kickoutSession != null)
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+ {
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+ // 设置会话的kickout属性表示踢出了
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+ kickoutSession.setAttribute("kickout", true);
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+ }
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+ }
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+
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+ // 如果被踢出了，(前者或后者)直接退出，重定向到踢出后的地址
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+ if ((Boolean) session.getAttribute("kickout") != null && (Boolean) session.getAttribute("kickout") == true)
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+ {
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+ // 退出登录
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+ subject.logout();
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+ saveRequest(request);
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+ return isAjaxResponse(request, response);
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+ }
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+ return true;
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+ }
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+ catch (Exception e)
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+ {
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+ return isAjaxResponse(request, response);
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+ }
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+ }
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+
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+ private boolean isAjaxResponse(ServletRequest request, ServletResponse response) throws IOException
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+ {
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+ HttpServletRequest req = (HttpServletRequest) request;
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+ HttpServletResponse res = (HttpServletResponse) response;
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+ if (ServletUtils.isAjaxRequest(req))
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+ {
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+ AjaxResult ajaxResult = AjaxResult.error("您已在别处登录，请您修改密码或重新登录");
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+ ServletUtils.renderString(res, objectMapper.writeValueAsString(ajaxResult));
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+ }
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+ else
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+ {
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+ WebUtils.issueRedirect(request, response, kickoutUrl);
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+ }
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+ return false;
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+ }
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+
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+ public void setMaxSession(int maxSession)
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+ {
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+ this.maxSession = maxSession;
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+ }
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+
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+ public void setKickoutAfter(boolean kickoutAfter)
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+ {
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+ this.kickoutAfter = kickoutAfter;
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+ }
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+
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+ public void setKickoutUrl(String kickoutUrl)
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+ {
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+ this.kickoutUrl = kickoutUrl;
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+ }
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+
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+ public void setSessionManager(SessionManager sessionManager)
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+ {
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+ this.sessionManager = sessionManager;
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+ }
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+
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+ // 设置Cache的key的前缀
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+ public void setCacheManager(CacheManager cacheManager)
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+ {
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+ // 必须和ehcache缓存配置中的缓存name一致
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+ this.cache = cacheManager.getCache("sys-userCache");
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+ }
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+}
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RuoYi