Merge branch 'chacky'

leecx-mng/leecx-mng-web/src/main/java/com/itzixi/web/shiro/filter/KickoutSessionControlFilter.java

@@ -0,0 +1,136 @@
+package com.itzixi.web.shiro.filter;
+
+import java.io.Serializable;
+import java.util.Deque;
+import java.util.LinkedList;
+
+import javax.servlet.ServletRequest;
+import javax.servlet.ServletResponse;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+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.itzixi.pojo.ActiveUser;
+
+/**
+ * 
+ * @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;
+
+    // TODO 分布式集群环境下，需要改为redis
+    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, 同步在本机的缓存中是有效的，但是一旦放入集群中，就会失效
+        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;
+    }
+}

leecx-mng/leecx-mng-web/src/main/resources/spring/applicationContext-shiro.xml

@@ -74,6 +74,7 @@
 				<entry key="authc">
 					<bean class="com.itzixi.web.shiro.filter.CustomFormAuthenticationFilter"></bean>
 				</entry>
+				<entry key="kickout" value-ref="kickoutSessionControlFilter"/>
 			</map>
 		</property>
 
@@ -92,12 +93,22 @@
                 /login.action = anon
                 /regist.action = anon
 
-                /** = authc
-<!--                 authc -->
+                /** = kickout,authc
+<!--                 kickout,authc -->
             </value>
         </property>
     </bean>
 
+    <bean id="kickoutSessionControlFilter" class="com.itzixi.web.shiro.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>
+
     <!-- 保证实现了Shiro内部lifecycle函数的bean执行 -->
     <bean id="lifecycleBeanPostProcessor" class="org.apache.shiro.spring.LifecycleBeanPostProcessor"/>