code: @SuppressWarnings("unchecked")
  	public <T> T hget(Object key, Object field) {
  		Jedis jedis = getJedis();
  		try {
  			return (T)valueFromBytes(jedis.hget(keyToBytes(key), fieldToBytes(field)));
  		}
  		finally {close(jedis);}
  	}
docs: 返回哈希表 key 中给定域 field 的值。