参考：https://blog.csdn.net/qq_34627002/article/details/80541121

一次性解决所有的。新建个如下的配置类。

@Configuration
public class RedisConfigBean {

/**
 *
 * @param factory redis连接 factory
 * @return redisTemplate
 */
@Bean(name = "redisTemplate")
public RedisTemplate<String, Object> redisTemplate(RedisConnectionFactory factory) {
    RedisTemplate<String, Object> template = new RedisTemplate<>();
    template.setConnectionFactory(factory);
    template.setKeySerializer(new StringRedisSerializer());
    template.setValueSerializer(new GenericJackson2JsonRedisSerializer());
    template.setHashKeySerializer(new GenericJackson2JsonRedisSerializer());
    template.setHashValueSerializer(new GenericJackson2JsonRedisSerializer());
    template.afterPropertiesSet();
    return template;
}

}

config.setCodec(new JsonJacksonCodec());

自己的问题：配置类没有添加@Configuration注解
后来调试了一下代码发现没有走配置