如何使用spring boot 2.0配置redis ttl

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

spring.redis.host=127.0.0.1
spring.redis.port=6379
spring.redis.password=your_password

@Configuration
public class RedisConfig {

    @Bean
    public RedisTemplate<String, Object> redisTemplate(RedisConnectionFactory redisConnectionFactory) {
        RedisTemplate<String, Object> redisTemplate = new RedisTemplate<>();
        redisTemplate.setConnectionFactory(redisConnectionFactory);
        redisTemplate.setKeySerializer(new StringRedisSerializer());
        redisTemplate.setValueSerializer(new GenericJackson2JsonRedisSerializer());
        return redisTemplate;
    }
}

@Autowired
private RedisTemplate<String, Object> redisTemplate;

public void setWithTTL(String key, Object value, long ttl) {
    redisTemplate.opsForValue().set(key, value, ttl, TimeUnit.SECONDS);
}