Shiro缓存可以用来临时缓存授权信息，这样就可以不用每次都去查数据库，在一定程度上提高了使用效率。

依赖

<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-data-redis</artifactId>
  <version>2.5.3</version>
</dependency>

自定义Shiro的缓存管理器

import org.apache.shiro.cache.Cache;
import org.apache.shiro.cache.CacheException;
import org.apache.shiro.cache.CacheManager;
import org.springframework.data.redis.core.RedisTemplate;

import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;


public class ShiroRedisCacheManager implements CacheManager {

    private final ConcurrentMap<String, Cache> caches = new ConcurrentHashMap<>();
    //TODO:缓存存活时间
    private long cacheLive;
    //TODO:缓存名称前缀
    private String cacheKeyPrefix;
    private RedisTemplate redisTemplate;

    public ShiroRedisCacheManager() {
    }

    public ShiroRedisCacheManager(long cacheLive, String cacheKeyPrefix, RedisTemplate redisTemplate) {
        this.cacheLive = cacheLive;
        this.cacheKeyPrefix = cacheKeyPrefix;
        this.redisTemplate = redisTemplate;
    }

    @Override
    public <K, V> Cache<K, V> getCache(String name) throws CacheException {
        Cache cache = this.caches.get(name);
        if (null == cache) {
            //TODO:自定义Shiro的Cache
            cache = new ShiroRedisCache<K, V>(cacheLive, cacheKeyPrefix, redisTemplate);
            this.caches.put(name, cache);
        }
        return cache;
    }

    public long getCacheLive() {
        return cacheLive;
    }

    public void setCacheLive(long cacheLive) {
        this.cacheLive = cacheLive;
    }

    public String getCacheKeyPrefix() {
        return cacheKeyPrefix;
    }

    public void setCacheKeyPrefix(String cacheKeyPrefix) {
        this.cacheKeyPrefix = cacheKeyPrefix;
    }

    public RedisTemplate getRedisTemplate() {
        return redisTemplate;
    }

    public void setRedisTemplate(RedisTemplate redisTemplate) {
        this.redisTemplate = redisTemplate;
    }
}

自定义配置

@Resource(name = "shiroRedisTemplate")
    private RedisTemplate redisTemplate;

    /**
     * 全局缓存时间，单位为秒
     */
    @Value("${hdw.jwt.expiration}")
    private int cacheLive;

    /**
     * 全局缓存名称前缀，默认为应用名
     */
    @Value("${spring.application.name}")
    private String cacheKeyPrefix;

    /**
     * 缓存管理器
     *
     * @return
     */
    @Bean
    public CacheManager shiroRedisCacheManager() {
        ShiroRedisCacheManager redisCacheManager = new ShiroRedisCacheManager(cacheLive * 1000, cacheKeyPrefix + ":shiro-cache:", redisTemplate);
        return redisCacheManager;
    }