【jfinal修仙系列】扩展ShiroCacheManager 支持Redis缓存

原创
2017/04/06 12:39
阅读数 958

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shiro 内置CacheManager

  • MemoryConstrainedCacheManager (适用于单JVM生产环境的实现)
shiroCacheManager = org.apache.shiro.cache.MemoryConstrainedCacheManager
securityManager.cacheManager = $shiroCacheManager
 
  • EhCacheManager (依赖ehcache)
shiroCacheManager = org.apache.shiro.cache.ehcache.EhCacheManager
shiroCacheManager.cacheManagerConfigFile = classpath:ehcache-shiro.xml
securityManager.cacheManager = $shiroCacheManager
 

自定义RedisCacheManager 支持Redis缓存

public class RedisCacheManager implements CacheManager {
    private final ConcurrentMap<String, Cache> caches = new ConcurrentHashMap<String, Cache>();
    /*永不过期*/
    private int expire = 0;

    public int getExpire() {
        return expire;
    }

    public void setExpire(int expire) {
        this.expire = expire;
    }

    public <K, V> Cache<K, V> getCache(String name) throws CacheException {
        Cache c = caches.get(name);
        if (c == null) {
            c = new RedisCache<K, V>(expire);
            caches.put(name, c);
        }
        return c;
    }
}

RedisCache实现

public class RedisCache<K, V> implements org.apache.shiro.cache.Cache<K, V> {
    private static String SHIRO_KEY = "shiro";
    private int expire = 0;

    public RedisCache(int expire) {
        this.expire = expire;
    }

    public V get(K key) throws CacheException {
        LogKit.debug("根据key从Redis中获取对象 key [" + key + "]");
        if (key == null) {
            return null;
        } else {
            return Redis.use().hget(SHIRO_KEY, key);
        }
    }

    public V put(K key, V value) throws CacheException {
        LogKit.debug("根据key从存储 key [" + key + "]");
        Redis.use().hset(SHIRO_KEY, key, value);
        Redis.use().expire(SHIRO_KEY, expire);
        return value;
    }

    /**
     * shiro 的默认删除KEY:用户的
     *
     * @throws CacheException CacheException
     */
    public V remove(K key) throws CacheException {
        LogKit.debug("从redis中删除 key [" + key + "]");
        V previous = get(key);
        return previous;
    }

    public void clear() throws CacheException {
        LogKit.debug("从redis中删除所有元素");
        try {
            Redis.use().del(SHIRO_KEY);
        } catch (Throwable t) {
            throw new CacheException(t);
        }
    }

    public int size() {
        Long length = Redis.use().hlen(SHIRO_KEY);
        return length.intValue();
    }

    public Set<K> keys() {
        return (Set<K>) Redis.use().hkeys(SHIRO_KEY);
    }

    public Collection<V> values() {
        return Redis.use().hvals(SHIRO_KEY);
    }
}

使用方法

在ini文件中配置

shiroCacheManager = io.github.wx.common.shiro.cache.RedisCacheManager
shiroCacheManager.expire = 1800
securityManager.cacheManager = $shiroCacheManager

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