Spring Boot如何利用拦截器加缓存完成接口防刷操作

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.3.3.RELEASE</version>
</parent>

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

@Override
	public boolean preHandle(HttpServletRequest request ,HttpServletResponse response ,Object handler) throws Exception {
		
        log.info("------------接口防刷拦截器---------------");

        if (handler instanceof HandlerMethod) {

            HandlerMethod handlerMethod = (HandlerMethod) handler;

            AccessLimit accessLimit = handlerMethod.getMethodAnnotation(AccessLimit.class);
            // 如果没有该注解，则不在防刷目标里，直接返回
            if (accessLimit == null) {
                return true;
            }
            // 获取最大访问次数
            int maxAccessCnt = accessLimit.maxAccessCnt();
            // 获取ip
            String key = getRealIp(request);
            // ip+请求的接口路径 => 唯一标识key
            key += request.getRequestURI();

            //当前访问次数
            Object value = redisTemplate.opsForValue().get(key);

            if (value == null) {
                //第一次访问 设置key保留时长为1s
                redisTemplate.opsForValue().set(key, 1, 1L, TimeUnit.SECONDS);
            } else {

                Integer currentCnt = (Integer) value;

                if (currentCnt < maxAccessCnt) {
                    //对应key值自增
                    redisTemplate.opsForValue().increment(key);
                } else {
                    //超出接口时间段内允许访问的次数，直接返回错误信息,同时设置过期时间 20s自动剔除
                    redisTemplate.expire(key, 20L,TimeUnit.SECONDS);
                    response.setContentType("application/json;charset=utf-8");
                    try {
                        OutputStream out = response.getOutputStream();
                        out.write("访问次数已达上线！请稍后再访问".getBytes(StandardCharsets.UTF_8));
                        out.flush();
                        out.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                    return false;
                }
            }


        }
        return true;
    }

/**
 * 返回不携带data的（成功例子）
 * @return
 */
@AccessLimit
@GetMapping("/getPaperS")
public ApiResult getPaperInfoSuccess() {
   if (log.isInfoEnabled()) {
      log.info("收到获取paper信息请求...");
   }
   //...业务逻辑
   if (log.isInfoEnabled()) {
      log.info("完成获取paper信息请求，准备返回对象信息");
   }
   return ApiResultGenerator.success();
}