springboot+shiro+redis整合中，启动项目时报错：

Error creating bean with name ‘shiroFilterFactory’ defined in class path resource

这是我的ShiroConfig类

package com.mh.common.config;

import com.mh.common.shiro.ShiroRealm;
import com.mh.common.shiro.ShiroRetryLimit;
import com.mh.common.shiro.ShiroSessionIdGenerator;
import com.mh.common.shiro.ShiroSessionManager;
import com.mh.common.util.SHA256Util;
import org.apache.shiro.authc.credential.HashedCredentialsMatcher;
import org.apache.shiro.cache.CacheManager;
import org.apache.shiro.mgt.SecurityManager;
import org.apache.shiro.session.mgt.SessionManager;
import org.apache.shiro.spring.security.interceptor.AuthorizationAttributeSourceAdvisor;
import org.apache.shiro.spring.web.ShiroFilterFactoryBean;
import org.apache.shiro.web.mgt.DefaultWebSecurityManager;
import org.crazycake.shiro.RedisCacheManager;
import org.crazycake.shiro.RedisManager;
import org.crazycake.shiro.RedisSessionDAO;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import java.util.LinkedHashMap;
import java.util.Map;

/**
 * @Description Shiro配置类
 */
@Configuration
public class ShiroConfig {

    private final String CACHE_KEY = "shiro:cache:";
    private final String SESSION_KEY = "shiro:session:";

    //Redis配置
    @Value("${spring.redis.host}")
    private String host;
    @Value("${spring.redis.port}")
    private int port;
    @Value("${spring.redis.timeout}")
    private int timeout;
    @Value("${spring.redis.password}")
    private String password;

    /**
     * 开启Shiro-aop注解支持
     * @Attention 使用代理方式所以需要开启代码支持
     */
    @Bean
    public AuthorizationAttributeSourceAdvisor authorizationAttributeSourceAdvisor(SecurityManager securityManager) {
        AuthorizationAttributeSourceAdvisor authorizationAttributeSourceAdvisor = new AuthorizationAttributeSourceAdvisor();
        authorizationAttributeSourceAdvisor.setSecurityManager(securityManager);
        return authorizationAttributeSourceAdvisor;
    }

    /**
     * Shiro基础配置
     */
    @Bean
    public ShiroFilterFactoryBean shiroFilterFactory(SecurityManager securityManager){
        ShiroFilterFactoryBean shiroFilterFactoryBean = new ShiroFilterFactoryBean();
        shiroFilterFactoryBean.setSecurityManager(securityManager);
        Map<String, String> filterChainDefinitionMap = new LinkedHashMap<>();
        // 注意过滤器配置顺序不能颠倒
        // 配置过滤:不会被拦截的链接
        filterChainDefinitionMap.put("/static/**", "anon");
        filterChainDefinitionMap.put("/upload/**", "anon");
        filterChainDefinitionMap.put("/login", "anon");
        filterChainDefinitionMap.put("/unauth", "anon");
        filterChainDefinitionMap.put("/**", "authc");
        // 配置shiro默认登录界面地址，前后端分离中登录界面跳转应由前端路由控制，后台仅返回json数据
        shiroFilterFactoryBean.setLoginUrl("/unauth");
        shiroFilterFactoryBean.setFilterChainDefinitionMap(filterChainDefinitionMap);
        return shiroFilterFactoryBean;
    }

    /**
     * 安全管理器
     */
    @Bean
    public DefaultWebSecurityManager securityManager() {
        DefaultWebSecurityManager securityManager = new DefaultWebSecurityManager();
        // 自定义Ssession管理
        securityManager.setSessionManager(sessionManager());
        // 自定义Cache实现
        securityManager.setCacheManager(cacheManager());
        // 自定义Realm验证
        securityManager.setRealm(shiroRealm());
        return securityManager;
    }

    /**
     * 身份验证器
     */
    @Bean
    public ShiroRealm shiroRealm() {
        ShiroRealm shiroRealm = new ShiroRealm();
        shiroRealm.setCredentialsMatcher(hashedCredentialsMatcher());
        return shiroRealm;
    }

    /**
     * 凭证匹配器
     * 将密码校验交给Shiro的SimpleAuthenticationInfo进行处理,在这里做匹配配置
     */
    @Bean
    public HashedCredentialsMatcher hashedCredentialsMatcher() {
        HashedCredentialsMatcher shaCredentialsMatcher = new HashedCredentialsMatcher();
        // 散列算法:这里使用SHA256算法;
        shaCredentialsMatcher.setHashAlgorithmName(SHA256Util.HASH_ALGORITHM_NAME);
        // 散列的次数，比如散列两次，相当于 md5(md5(""));
        shaCredentialsMatcher.setHashIterations(SHA256Util.HASH_ITERATIONS);
        return shaCredentialsMatcher;
    }

    /**
     * 配置Redis管理器
     * @Attention 使用的是shiro-redis开源插件
     */
    @Bean
    public RedisManager redisManager() {
        RedisManager redisManager = new RedisManager();
        redisManager.setHost(host);
        redisManager.setPort(port);
        redisManager.setTimeout(timeout);
        redisManager.setPassword(password);
        return redisManager;
    }

    /**
     * 配置Cache管理器
     * 用于往Redis存储权限和角色标识
     * @Attention 使用的是shiro-redis开源插件
     */
    @Bean
    public RedisCacheManager cacheManager() {
        RedisCacheManager redisCacheManager = new RedisCacheManager();
        redisCacheManager.setRedisManager(redisManager());
        redisCacheManager.setKeyPrefix(CACHE_KEY);
        // 配置缓存的话要求放在session里面的实体类必须有个id标识
        redisCacheManager.setPrincipalIdFieldName("id");
        return redisCacheManager;
    }

    /**
     * SessionID生成器
     */
    @Bean
    public ShiroSessionIdGenerator sessionIdGenerator(){
        return new ShiroSessionIdGenerator();
    }

    /**
     * 配置RedisSessionDAO
     * @Attention 使用的是shiro-redis开源插件
     */
    @Bean
    public RedisSessionDAO redisSessionDAO() {
        RedisSessionDAO redisSessionDAO = new RedisSessionDAO();
        redisSessionDAO.setRedisManager(redisManager());
        redisSessionDAO.setSessionIdGenerator(sessionIdGenerator());
        redisSessionDAO.setKeyPrefix(SESSION_KEY);
        redisSessionDAO.setExpire(timeout);
        return redisSessionDAO;
    }

    /**
     * 配置Session管理器
     */
    @Bean
    public SessionManager sessionManager() {
        ShiroSessionManager shiroSessionManager = new ShiroSessionManager();
        shiroSessionManager.setSessionDAO(redisSessionDAO());
        return shiroSessionManager;
    }
}

我按照 Error creating bean with name ‘shiroFilterFactory’ defined in class path resource 这个错误百度，找了半天都找不到解决方法。之后我看了下后面的后面的报错内容，定位，是在 securityManager() 方法中的

// 自定义Cache实现
securityManager.setCacheManager(cacheManager());

这一行出了问题，详细错误如下图：

然后我去百度 @Bean method ShiroConfig.cacheManager called as bean reference for type [org.crazycake.shiro.RedisCacheManager] 这个错误，就找到问题所在了：Redis 缓存管理器和 Shiro 的缓存管理器重名了，而这二者又是通过 Spring 管理，所以 Spring 读取这二者的时候，产生了冲突。

解决方法：

就是在自己的RedisCacheManager 中，把@Bean指定一个名称。将上面ShiroConfig类中的cacheManager()方法的@Bean命个名：

@Bean("ehCacheManager")
public RedisCacheManager cacheManager() {
    RedisCacheManager redisCacheManager = new RedisCacheManager();
    redisCacheManager.setRedisManager(redisManager());
    redisCacheManager.setKeyPrefix(CACHE_KEY);
    // 配置缓存的话要求放在session里面的实体类必须有个id标识
    redisCacheManager.setPrincipalIdFieldName("id");
    return redisCacheManager;
}

再次重启，没问题了。