我們需要根據ip去限制用戶單位時間的訪問次數，防止刷手機驗證碼,屏蔽注冊機等，使用注解就非常靈活了

1 定義注解

@Retention(RetentionPolicy.RUNTIME)@Target(ElementType.METHOD)@Documented//最高優先級@Order(Ordered.HIGHEST_PRECEDENCE)public @interface RequestLimit {    /**     *      * 允許訪問的次數，默認值MAX_VALUE     */    int count() default Integer.MAX_VALUE;    /**     *      * 時間段，單位為毫秒，默認值一分鐘     */    long time() default 60000;}

2 實現注解

@aspect@Componentpublic class RequestLimitContract {    private static final Logger logger = LoggerFactory.getLogger("RequestLimitLogger");    @Autowired    private RedisTemplate<String, String> redisTemplate;    @Before("within(@org.springframework.stereotype.Controller *) && @annotation(limit)")    public void requestLimit(final JoinPoint joinPoint, RequestLimit limit) throws RequestLimitException {      try {            Object[] args = joinPoint.getArgs();            HttpServletRequest request = null;            for (int i = 0; i < args.length; i++) {                if (args[i] instanceof HttpServletRequest) {                    request = (HttpServletRequest) args[i];                    break;                }            }            if (request == null) {                throw new RequestLimitException("方法中缺失HttpServletRequest參數");            }            String ip = HttpRequestUtil.getIpAddr(request);            String url = request.getRequestURL().toString();            String key = "req_limit_".concat(url).concat(ip);            long count = redisTemplate.opsForValue().increment(key, 1);            if (count == 1) {                redisTemplate.expire(key, limit.time(), TimeUnit.MILLISECONDS);            }            if (count > limit.count()) {                logger.info("用戶IP[" + ip + "]訪問地址[" + url + "]超過了限定的次數[" + limit.count() + "]");                throw new RequestLimitException();            }        } catch (RequestLimitException e) {            throw e;        } catch (Exception e) {            logger.error("發生異常: ", e);        }    }}

3 自定義Exception

public class RequestLimitException extends Exception {    private static final long serialVersionUID = 1364225358754654702L;    public RequestLimitException() {        super("HTTP請求超出設定的限制");    }    public RequestLimitException(String message) {        super(message);    }}

4 在Controller中使用

@RequestLimit(count=100,time=60000)@RequestMapping("/test")public String test(HttpServletRequest request, ModelMap modelMap) {    //TODO }

我使用了redis緩存訪問次數,并且設置自增1，其實用靜態map也可以。