ZuulFilter 限流

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package com.example.apigeteway.filter;   import com.example.apigeteway.exception.RateLimitException; import com.google.common.util.concurrent.RateLimiter; import com.netflix.zuul.ZuulFilter; import com.netflix.zuul.exception.ZuulException; import org.springframework.stereotype.Component;   import static org.springframework.cloud.netflix.zuul.filters.support.FilterConstants.PRE_TYPE; import static org.springframework.cloud.netflix.zuul.filters.support.FilterConstants.SERVLET_DETECTION_FILTER_ORDER;   /**  * @Title: RateLimitFilter  * @ProjectName api-geteway  * @date 2019/12/1712:59  * @Desc 令牌桶 限流  */ @Component public class RateLimitFilter extends ZuulFilter {     // 每秒放多少个令牌 (100个)     private static final RateLimiter RATE_LIMITER = RateLimiter.create(100);     @Override     public String filterType() {         return PRE_TYPE;     }       @Override     public int filterOrder() {         return SERVLET_DETECTION_FILTER_ORDER - 1;     }       @Override     public boolean shouldFilter() {         return false;     }       @Override     public Object run() throws ZuulException {         if (RATE_LIMITER.tryAcquire()){             throw new RateLimitException();         }         return null;     } }