SpringCloud------Zuul过滤器结合谷歌Gauva现实限流

前提：

已经配置Zuul网关

参考：

https://www.cnblogs.com/tianhengblogs/p/12495370.html

限流方式：

1）nginx层限流

2）网关层限流

1.添加限流过滤器

import com.alibaba.fastjson.JSON;
import com.google.common.util.concurrent.RateLimiter;
import com.netflix.zuul.ZuulFilter;
import com.netflix.zuul.context.RequestContext;
import com.netflix.zuul.exception.ZuulException;
import org.apache.commons.lang.StringUtils;
import org.springframework.http.HttpStatus;
import org.springframework.stereotype.Component;
import org.springframework.util.AntPathMatcher;

import javax.servlet.http.HttpServletRequest;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import static org.springframework.cloud.netflix.zuul.filters.support.FilterConstants.PRE_TYPE;

/**
 * 订单限流接口
 */
@Component
public class OrderRateLimiterFilter extends ZuulFilter {

    //每秒产生1000个令牌
    private static final RateLimiter RATE_LIMITER = RateLimiter.create(1000);

    @Override
    public String filterType() {
        return PRE_TYPE;
    }

    @Override
    public int filterOrder() {
        return -4;
    }

    @Override
    public boolean shouldFilter() {

        RequestContext context = RequestContext.getCurrentContext();
        HttpServletRequest request = context.getRequest();

        ///apigateway/order/api/v1/order/test
        System.out.println(request.getRequestURI());
        //http://127.0.0.1:9000/apigateway/order/api/v1/order/test
        System.out.println(request.getRequestURL());

        //限流的接口
        List<String> noFIlter = new ArrayList<>();
        noFIlter.add("/apigateway/order/**");

        AntPathMatcher matcher = new AntPathMatcher();
        for (String pattern : noFIlter) {//pattern--/user/**
            if (StringUtils.isNotEmpty(pattern)
                    && matcher.match(pattern, request.getRequestURI())) {
                return true;
            }
        }

        return false;
    }

    @Override
    public Object run() throws ZuulException {

        //可以用JMeter来进行测试
        RequestContext context = RequestContext.getCurrentContext();
        //tryAcquire达到最大流量时,立刻限流,也可以配置参数
        if (!RATE_LIMITER.tryAcquire()) {
            Map<String, Object> result = new HashMap<>();
            result.put("code", 429);
            result.put("msg", "目前访问量过大,限流了...");

            context.setSendZuulResponse(false);
            context.setResponseStatusCode(HttpStatus.TOO_MANY_REQUESTS.value());
            context.setResponseBody(JSON.toJSONString(result));
            //解决中文乱码
            context.getResponse().setCharacterEncoding("UTF-8");
            context.getResponse().setContentType("text/html;charset=UTF-8");
        }

        return null;
    }
}

令牌桶限流图解

转载：

https://www.cnblogs.com/cjsblog/p/9379516.html