shiro教程-第十八章

wavelou · Feb 19, 2014 · b49321b · b49321b
1 parent 6ca2813
commit b49321b
Showing 1 changed file with 7 additions and 2 deletions.
diff --git a/.../com/github/zhangkaitao/shiro/chapter18/web/shiro/filter/KickoutSessionControlFilter.java b/.../com/github/zhangkaitao/shiro/chapter18/web/shiro/filter/KickoutSessionControlFilter.java
@@ -58,6 +58,7 @@ protected boolean isAccessAllowed(ServletRequest request, ServletResponse respon
     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;
         }
 
@@ -72,26 +73,30 @@ protected boolean onAccessDenied(ServletRequest request, ServletResponse respons
             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) {
+            if(kickoutAfter) { //如果踢出后者
                 kickoutSessionId = deque.removeFirst();
-            } else {
+            } 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 {