dependencies {
  implementation('org.springframework.cloud:spring-cloud-starter-netflix-eureka-client')
  implementation('org.springframework.cloud:spring-cloud-starter-netflix-zuul')
  testImplementation('org.springframework.boot:spring-boot-starter-test')
  implementation('com.marcosbarbero.cloud:spring-cloud-zuul-ratelimit:1.3.2.RELEASE')
}

server:
 port: 8300
spring:
 application:
  name: microservice-gateway-zuul
eureka:
 client:
  register-with-eureka: true
  fetch-registry: true
  service-url:
   defaultZone: http://localhost:6761/eureka
 instance:
  ip-address: true
zuul:
 routes:
  users:
    path: /lind/** #以lind開頭的路徑被重定向到lind服務(wù)
    serviceId: lind
 add-host-header: true #顯示真實(shí)的http頭
 retryable: false #關(guān)閉Hystrix的重試功能
 ratelimit:
  enabled: true
  # repository: REDIS
  behind-proxy: true
  policies:
    users:
     limit: 5 #限流，每分鐘請(qǐng)求5次
     refresh-interval: 60
     type:
      - user
      - origin
      - url
     #    url類型的限流就是通過請(qǐng)求路徑區(qū)分
     #    origin是通過客戶端IP地址區(qū)分
     #    user是通過授權(quán)用戶進(jìn)行區(qū)分，也包括匿名用戶

public class PreRequestLogFilter extends ZuulFilter {
 private static final Logger logger = LoggerFactory.getLogger(PreRequestLogFilter.class);
 private final RateLimiter rateLimiter = RateLimiter.create(1000.0);
 @Override
 public Object run() {
  try {
   RequestContext currentContext = RequestContext.getCurrentContext();
   HttpServletResponse response = currentContext.getResponse();
   HttpServletRequest reqeust = currentContext.getRequest();
   currentContext.addZuulRequestHeader("userId","123");//向子系統(tǒng)http頭寫數(shù)據(jù)
   currentContext.addZuulRequestHeader("userName","test");
   PreRequestLogFilter.logger.info(
     String.format("send %s request to %s",
       reqeust.getMethod(),
       reqeust.getRequestURL().toString()));
   if (!rateLimiter.tryAcquire()) {
    HttpStatus httpStatus = HttpStatus.TOO_MANY_REQUESTS;
    response.setContentType(MediaType.TEXT_PLAIN_VALUE);
    response.setStatus(httpStatus.value());
    response.getWriter().append(httpStatus.getReasonPhrase());
    currentContext.setSendZuulResponse(false);
    throw new ZuulException(
      httpStatus.getReasonPhrase(),
      httpStatus.value(),
      httpStatus.getReasonPhrase()
    );
   }
  } catch (java.lang.Exception e) {
   ReflectionUtils.rethrowRuntimeException(e);
  }
  return null;
 }
 @Override
 public boolean shouldFilter() {
  // 判斷是否需要過濾
  return true;
 }
 @Override
 public String filterType() {
  return FilterConstants.PRE_TYPE;
 }
 @Override
 public int filterOrder() {
  return Ordered.HIGHEST_PRECEDENCE;
 }
}

@Bean
 public PreRequestLogFilter preRequestLogFilter() {
  return new PreRequestLogFilter();
 }