一、前言
当我们的用户量到达一定程度的时候，单机的服务器已经支撑不了目前的访问量，我们肯定需要对服务器做集群来提高应用的负载能力.比如我们使用Nginx+Tomcat来实现集群,如果使用的是轮询的测试，我肯定需要涉及到Session共享的问题,解决Session共享有很多种方案,我们选择的是Shiro+Redis来实现。因为Shiro中本身就提供了sessionManager和sessionDAO，我们可以把shiro和redis集成起来，把session持久化到Redis中，然后需要使用的时候从Redis中获取对应的session.
二、实现步骤
步骤一:
在application.properties配置文件中添加Redis相关的配置
#redis
# Redis服务器地址
redis.host= localhost
# Redis服务器连接端口
redis.port= 6379
redis.jedis.pool.max-active=
# 连接池中的最大空闲连接
redis.pool.max-idle= 8
# 连接池中的最小空闲连接
redis.pool.min-idle= 0
# 连接池最大连接数（使用负值表示没有限制）
redis.pool.max-active= 8
# 连接池最大阻塞等待时间（使用负值表示没有限制）
redis.pool.max-wait= -1
# 连接超时时间（毫秒）
redis.timeout= 0
redis.password=
步骤二
我们需要在pom.xml中添加Shiro集成Redis的依赖
<dependency>
<groupId>org.crazycake</groupId>
<artifactId>shiro-redis</artifactId>
<version>2.4.2.1-RELEASE</version>
<exclusions>
<exclusion>
<artifactId>shiro-core</artifactId>
<groupId>org.apache.shiro</groupId>
</exclusion>
</exclusions>
</dependency>
步骤三
在Shiro相关配置中添加SessionManager和SessionDAO
package cn.wolfcode.saas.pss.config.shiro;
import cn.wolfcode.saas.pss.config.redis.RedisConfig;
import org.apache.shiro.spring.security.interceptor.AuthorizationAttributeSourceAdvisor;
import org.apache.shiro.spring.web.ShiroFilterFactoryBean;
import org.apache.shiro.spring.web.config.DefaultShiroFilterChainDefinition;
import org.apache.shiro.spring.web.config.ShiroFilterChainDefinition;
import org.apache.shiro.web.mgt.DefaultWebSecurityManager;
import org.apache.shiro.web.servlet.AbstractShiroFilter;
import org.apache.shiro.web.session.mgt.DefaultWebSessionManager;
import org.crazycake.shiro.RedisCacheManager;
import org.crazycake.shiro.RedisManager;
import org.crazycake.shiro.RedisSessionDAO;
import org.springframework.aop.framework.autoproxy.DefaultAdvisorAutoProxyCreator;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import javax.annotation.PostConstruct;
import javax.servlet.Filter;
import java.util.LinkedHashMap;
import java.util.Map;
/**
* Created by wolfcode-lanxw
*/
@Configuration
public class ShiroConfig {
/**
* 配置shiro redisManager
* 使用的是shiro-redis开源插件
* @return
*/
@Bean
public RedisManager redisManager(RedisConfig redisConfig) {
RedisManager redisManager = new RedisManager();
redisManager.setHost(redisConfig.getHost());
redisManager.setPort(redisConfig.getPort());
redisManager.setExpire(1800);// 配置缓存过期时间
redisManager.setTimeout(redisConfig.getTimeout());
return redisManager;
}
@Bean
public RedisSessionDAO redisSessionDAO(RedisManager redisManager) {
RedisSessionDAO redisSessionDAO = new RedisSessionDAO();
redisSessionDAO.setRedisManager(redisManager);
return redisSessionDAO;
}
/**
* shiro session的管理
*/
@Bean
public DefaultWebSessionManager redisSessionManager(RedisSessionDAO redisSessionDAO) {
DefaultWebSessionManager sessionManager = new DefaultWebSessionManager();
sessionManager.setSessionDAO(redisSessionDAO);
return sessionManager;
}
@Bean
public RedisCacheManager redisCacheManager(RedisManager redisManager) {
RedisCacheManager redisCacheManager = new RedisCacheManager();
redisCacheManager.setRedisManager(redisManager);
return redisCacheManager;
}
/*
创建安全管理器对象,关联自定义Realm
*/
@Bean
public DefaultWebSecurityManager securityManager(UserRealm userRealm,DefaultWebSessionManager redisSessionManager,RedisCacheManager redisCacheManager){
DefaultWebSecurityManager securityManager = new DefaultWebSecurityManager();
securityManager.setRealm(userRealm);
securityManager.setSessionManager(redisSessionManager);
securityManager.setCacheManager(redisCacheManager);
return securityManager;
}
@Bean(name = "shiroFilterFactoryBean")
protected ShiroFilterFactoryBean shiroFilterFactoryBean(DefaultWebSecurityManager securityManager) {
ShiroFilterFactoryBean shiroFilterFactoryBean = new ShiroFilterFactoryBean();
shiroFilterFactoryBean.setSecurityManager(securityManager);
Map<String, Filter> filterMap = new LinkedHashMap<>();
filterMap.put("authc", new AjaxPermissionsAuthorizationFilter());
shiroFilterFactoryBean.setFilters(filterMap);
Map<String, String> filterChainDefinitionMap = new LinkedHashMap<>();
filterChainDefinitionMap.put("/", "anon");
filterChainDefinitionMap.put("/static/**", "anon");
filterChainDefinitionMap.put("/error", "anon");
filterChainDefinitionMap.put("/login", "anon");
filterChainDefinitionMap.put("/**", "authc");
shiroFilterFactoryBean.setFilterChainDefinitionMap(filterChainDefinitionMap);
return shiroFilterFactoryBean;
}
/**
* 开启Shiro的注解(如@RequiresRoles,@RequiresPermissions),需借助SpringAOP扫描使用Shiro注解的类,并在必要时进行安全逻辑验证
* 配置以下两个bean(DefaultAdvisorAutoProxyCreator和AuthorizationAttributeSourceAdvisor)即可实现此功能
* @return
*/
@Bean
public DefaultAdvisorAutoProxyCreator advisorAutoProxyCreator(){
DefaultAdvisorAutoProxyCreator advisorAutoProxyCreator = new DefaultAdvisorAutoProxyCreator();
advisorAutoProxyCreator.setProxyTargetClass(true);
return advisorAutoProxyCreator;
}
/**
* 开启aop注解支持
* @param securityManager
* @return
*/
@Bean
public AuthorizationAttributeSourceAdvisor authorizationAttributeSourceAdvisor(org.apache.shiro.mgt.SecurityManager securityManager) {
AuthorizationAttributeSourceAdvisor authorizationAttributeSourceAdvisor = new AuthorizationAttributeSourceAdvisor();
authorizationAttributeSourceAdvisor.setSecurityManager(securityManager);
return authorizationAttributeSourceAdvisor;
}
}
主要是在DefaultWebSecurityManager中需要配置对应的sessionManager和CacheManager即可.
配置好之后，当登录完成，会在Redis中看到对应的key.而且此时的缓存也交给了redis来处理了
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