public void set(String key, String value, long timeout) {

    redisTemplate.opsForValue().set(key, value, timeout, TimeUnit.SECONDS);

}

改完之后

public void set(String key, String value, long timeout) {
    redisTemplate.setKeySerializer(new StringRedisSerializer());
    redisTemplate.opsForValue().set(key, value, timeout, TimeUnit.SECONDS);

}