对象缓存到redis

@Autowired
private StringRedisTemplate stringRedisTemplate;

public SeckillUser getSeckillUser(long id) {
        //查redis缓存
        String seckillGoods = stringRedisTemplate.opsForValue().get(SeckillUserKey.seckillUserKey.getPrefix() + id);
        if(!StringUtils.isEmpty(seckillGoods)){
            //如果不为空，把字符串转换成对象返回
            SeckillUser seckillUser = JSON.parseObject(seckillGoods, SeckillUser.class);
            return seckillUser;
        }
        //如果redis里面没有，就从数据库查
        SeckillUser seckillUser = seckUserMapper.selectById(id);
        //如果数据库里查出来了，就转换成json字符串添加到redis里
        if(seckillUser!=null){
            String seckillUserjson = JSON.toJSONString(seckillUser);
            stringRedisTemplate.opsForValue().set(SeckillUserKey.seckillUserKey.getPrefix() + id,seckillUserjson);
        }
        return seckillUser;
    }