@Configuration
public class RedisConfig {

    @Bean
    public RedisTemplate<String, Serializable> redisTemplate(LettuceConnectionFactory connectionFactory){
        RedisTemplate<String, Serializable> redisTemplate = new RedisTemplate<>();
        redisTemplate.setKeySerializer(new StringRedisSerializer());
        redisTemplate.setValueSerializer(new GenericJackson2JsonRedisSerializer());
        redisTemplate.setConnectionFactory(connectionFactory);
        return redisTemplate;
    }
}

@RestController
public class GoodController{
    @Autowired
    private StringRedisTemplate stringRedisTemplate;

    @Value("${server.port}")
    private String serverPort;

    @GetMapping("/buy_goods")
    public String buy_Goods(){
        String result = stringRedisTemplate.opsForValue().get("goods:001");
        int goodsNumber = result == null ? 0 : Integer.parseInt(result);

        if(goodsNumber > 0){
            int realNumber = goodsNumber - 1;
            stringRedisTemplate.opsForValue().set("goods:001",realNumber + "");
            System.out.println("你已经成功秒杀商品,此时还剩余:" + realNumber + "件"+"\t 服务器端口:"+serverPort);
            return "你已经成功秒杀商品,此时还剩余:" + realNumber + "件"+"\t 服务器端口:"+serverPort;
        }else{
            System.out.println("商品已经售罄/活动结束/调用超时,欢迎下次光临"+"\t 服务器端口:"+serverPort);
        }
        return "商品已经售罄/活动结束/调用超时,欢迎下次光临"+"\t 服务器端口:"+serverPort;
    }
}