自定义访问控制拦截器：AccessControlFilter，集成这个接口后要实现下面这三个方法。
abstract boolean isAccessAllowed(ServletRequest request, ServletResponse response, Object mappedValue) throws Exception;
boolean onAccessDenied(ServletRequest request, ServletResponse response, Object mappedValue) throws Exception;
abstract boolean onAccessDenied(ServletRequest request, ServletResponse response) throws Exception;
在ShiroConfig
/**
* 限制同一账号登录同时登录人数控制
* @return
*/
//@Bean
public GunsUserFilter gunsUserFilter(){
GunsUserFilter gunsUserFilter = new GunsUserFilter();
//使用cacheManager获取相应的cache来缓存用户登录的会话；用于保存用户—会话之间的关系的；
//这里我们还是用之前shiro使用的redisManager()实现的cacheManager()缓存管理
//也可以重新另写一个，重新配置缓存时间之类的自定义缓存属性
gunsUserFilter.setCacheManager(getCacheShiroManager(new EhCacheManagerFactoryBean()));
gunsUserFilter.setKickoutAfter(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；
gunsUserFilter.setMaxSession(1);
//被踢出后重定向到的地址；
gunsUserFilter.setKickoutUrl("/login");
return gunsUserFilter;
}
自定义GunsUserFilter
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package com.stylefeng.guns.core.intercept;
import com.stylefeng.guns.config.web.ShiroConfig;
import com.stylefeng.guns.core.cache.CacheKit;
import com.stylefeng.guns.core.shiro.ShiroKit;
import com.stylefeng.guns.core.shiro.ShiroUser;
import com.stylefeng.guns.core.common.constant.cache.Cache;
import com.stylefeng.guns.core.util.SpringContextHolder;
import com.stylefeng.guns.core.util.ToolUtil;
import org.apache.shiro.SecurityUtils;
import org.apache.shiro.cache.CacheManager;
import org.apache.shiro.session.Session;
import org.apache.shiro.session.SessionException;
import org.apache.shiro.session.mgt.DefaultSessionKey;
import org.apache.shiro.session.mgt.SessionContext;
import org.apache.shiro.session.mgt.SessionKey;
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.session.mgt.DefaultWebSessionManager;
import org.apache.shiro.web.util.WebUtils;
import javax.annotation.Resource;
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;
/**
* Filter that allows access to resources if the accessor is a known user, which is defined as
* having a known principal. This means that any user who is authenticated or remembered via a
* 'remember me' feature will be allowed access from this filter.
* <p/>
* If the accessor is not a known user, then they will be redirected to the {@link #setLoginUrl(String) loginUrl}</p>
*
* @since 0.9
*/
public class GunsUserFilter 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 org.apache.shiro.cache.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;
}
//设置Cache的key的前缀
public void setCacheManager(CacheManager cacheManager) {
this.cache = cacheManager.getCache("shiro_redis_cache");
}
/**
* Returns <code>true</code> if the request is a
* {@link #isLoginRequest(javax.servlet.ServletRequest, javax.servlet.ServletResponse) loginRequest} or
* if the current {@link #getSubject(javax.servlet.ServletRequest, javax.servlet.ServletResponse) subject}
* is not <code>null</code>, <code>false</code> otherwise.
*
* @return <code>true</code> if the request is a
* {@link #isLoginRequest(javax.servlet.ServletRequest, javax.servlet.ServletResponse) loginRequest} or
* if the current {@link #getSubject(javax.servlet.ServletRequest, javax.servlet.ServletResponse) subject}
* is not <code>null</code>, <code>false</code> otherwise.
*/
protected boolean isAccessAllowed(ServletRequest request, ServletResponse response, Object mappedValue) {
return false;
/*if (isLoginRequest(request, response)) {
return true;
} else {
Subject subject = getSubject(request, response);
// If principal is not null, then the user is known and should be allowed access.
return subject.getPrincipal() != null;
}*/
}
/**
* This default implementation simply calls
* {@link #saveRequestAndRedirectToLogin(javax.servlet.ServletRequest, javax.servlet.ServletResponse) saveRequestAndRedirectToLogin}
* and then immediately returns <code>false</code>, thereby preventing the chain from continuing so the redirect may
* execute.
*/
protected boolean onAccessDenied(ServletRequest request, ServletResponse response) throws Exception {
HttpServletRequest httpServletRequest = WebUtils.toHttp(request);
HttpServletResponse httpServletResponse = WebUtils.toHttp(response);
/**
* 如果是ajax请求则不进行跳转
*/
if (httpServletRequest.getHeader("x-requested-with") != null
&& httpServletRequest.getHeader("x-requested-with").equalsIgnoreCase("XMLHttpRequest")) {
httpServletResponse.setHeader("sessionstatus", "timeout");
return false;
} else {
/*-----------------单机用户唯一登陆------------------------------*/
/**
*
* @date 创建时间：2018年3月27日
* 1.读取当前登录用户名，获取在缓存中的sessionId队列
* 2.判断队列的长度，大于最大登录限制的时候，按踢出规则
* 将之前的sessionId中的session域中存入kickout：true，并更新队列缓存
* 3.判断当前登录的session域中的kickout如果为true，
* 想将其做退出登录处理，然后再重定向到踢出登录提示页面
*/
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();
ShiroUser user = ShiroKit.getUser();
String username = user.getAccount();
Serializable sessionId = session.getId();
//读取缓存 没有就存入
Deque<Serializable> deque = cache.get(username);
//如果此用户没有session队列，也就是还没有登录过，缓存中没有
//就new一个空队列，不然deque对象为空，会报空指针
if(deque==null){
deque = new LinkedList<Serializable>();
}
//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) {
//将sessionId存入队列
deque.push(sessionId);
//将用户的sessionId队列缓存
cache.put(username, deque);
}
//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();
//踢出后再更新下缓存队列
cache.put(username, deque);
} else { //否则踢出前者
kickoutSessionId = deque.removeLast();
//踢出后再更新下缓存队列
cache.put(username, deque);
}
try {
//获取被踢出的sessionId的session对象
Session kickoutSession = SecurityUtils.getSecurityManager().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 ((Boolean)session.getAttribute("kickout")!=null&&(Boolean)session.getAttribute("kickout") == true) {
System.out.println("被踢出");
//会话被踢出了
try {
//退出登录
subject.logout();
} catch (Exception e) { //ignore
}
saveRequest(request);
//重定向
WebUtils.issueRedirect(request, response, kickoutUrl);
return false;
}
return true;
/*--------------------------------------------------------*/
/**
* 第一次点击页面
*/
/*String referer = httpServletRequest.getHeader("Referer");
if (referer == null) {
System.out.println("进来7");
redirectToLogin(request, response);
return false;
} else {
System.out.println("进来8");
//从别的页面跳转过来的
if (ShiroKit.getSession().getAttribute("sessionFlag") == null) {
System.out.println("进来9");
httpServletRequest.setAttribute("tips", "session超时");
httpServletRequest.getRequestDispatcher("/login.html").forward(request, response);
return false;
} else {
System.out.println("进来10");
redirectToLogin(request, response);
return false;
}
}*/
}
}
}
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