content: package com.ruoyi.framework.shiro.web.filter.online;
  
  import java.io.IOException;
  import javax.servlet.ServletRequest;
  import javax.servlet.ServletResponse;
  import org.apache.shiro.session.Session;
  import org.apache.shiro.subject.Subject;
  import org.apache.shiro.web.filter.AccessControlFilter;
  import org.apache.shiro.web.util.WebUtils;
  import org.springframework.beans.factory.annotation.Value;
  import com.ruoyi.common.constant.ShiroConstants;
  import com.ruoyi.common.core.domain.entity.SysUser;
  import com.ruoyi.common.enums.OnlineStatus;
  import com.ruoyi.common.utils.ShiroUtils;
  import com.ruoyi.framework.shiro.session.OnlineSession;
  import com.ruoyi.framework.shiro.session.OnlineSessionDAO;
  
  /**
   * 自定义访问控制
   * 
   * @author ruoyi
   */
  public class OnlineSessionFilter extends AccessControlFilter
  {
      /**
       * 强制退出后重定向的地址
       */
      @Value("${shiro.user.loginUrl}")
      private String loginUrl;
  
      private OnlineSessionDAO onlineSessionDAO;
  
      /**
       * 表示是否允许访问；mappedValue就是[urls]配置中拦截器参数部分，如果允许访问返回true，否则false；
       */
      @Override
      protected boolean isAccessAllowed(ServletRequest request, ServletResponse response, Object mappedValue)
              throws Exception
      {
          Subject subject = getSubject(request, response);
          if (subject == null || subject.getSession() == null)
          {
              return true;
          }
          Session session = onlineSessionDAO.readSession(subject.getSession().getId());
          if (session != null && session instanceof OnlineSession)
          {
              OnlineSession onlineSession = (OnlineSession) session;
              request.setAttribute(ShiroConstants.ONLINE_SESSION, onlineSession);
              // 把user对象设置进去
              boolean isGuest = onlineSession.getUserId() == null || onlineSession.getUserId() == 0L;
              if (isGuest == true)
              {
                  SysUser user = ShiroUtils.getSysUser();
                  if (user != null)
                  {
                      onlineSession.setUserId(user.getUserId());
                      onlineSession.setLoginName(user.getLoginName());
  					onlineSession.setAvatar(user.getAvatar());
                      onlineSession.setDeptName(user.getDept().getDeptName());
                      onlineSession.markAttributeChanged();
                  }
              }
  
              if (onlineSession.getStatus() == OnlineStatus.off_line)
              {
                  return false;
              }
          }
          return true;
      }
  
      /**
       * 表示当访问拒绝时是否已经处理了；如果返回true表示需要继续处理；如果返回false表示该拦截器实例已经处理了，将直接返回即可。
       */
      @Override
      protected boolean onAccessDenied(ServletRequest request, ServletResponse response) throws Exception
      {
          Subject subject = getSubject(request, response);
          if (subject != null)
          {
              subject.logout();
          }
          saveRequestAndRedirectToLogin(request, response);
          return false;
      }
  
      // 跳转到登录页
      @Override
      protected void redirectToLogin(ServletRequest request, ServletResponse response) throws IOException
      {
          WebUtils.issueRedirect(request, response, loginUrl);
      }
  
      public void setOnlineSessionDAO(OnlineSessionDAO onlineSessionDAO)
      {
          this.onlineSessionDAO = onlineSessionDAO;
      }
  }
  