1）gateway添加sentinel相关依赖

<spring-cloud.version>2021.0.1</spring-cloud.version>
<spring-cloud-alibaba.version>2021.0.1.0</spring-cloud-alibaba.version>

<dependencies>

    <!--gateway-->
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-gateway</artifactId>
    </dependency>

    <!--sentinel-->
    <dependency>
        <groupId>com.alibaba.cloud</groupId>
        <artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
        <version>2021.0.1.0</version>
    </dependency>
    <!--sentinel-gateway-->
    <dependency>
        <groupId>com.alibaba.cloud</groupId>
        <artifactId>spring-cloud-alibaba-sentinel-gateway</artifactId>
        <version>2021.0.1.0</version>
    </dependency>

</dependencies>

2）gateway添加相关的配置

spring:
  cloud:
    gateway:
      routes:
        - id: user-service
          uri: http://localhost:8081
          predicates:
            - Path=/user/*
    sentinel:
      transport:
        dashboard: localhost:8888

3）启动gateway

4）下载sentinel控制台并启动

下载地址：https://github.com/alibaba/Sentinel/releases
启动：java -Dserver.port=8888 -jar sentinel-dashboard-1.8.6.jar

5）sentinel控制台添加流控规则

先访问一下网关：http://localhost:8080/user/1
添加流控规则：

6）jmeter压测

10个并发请求，只有5个会成功：

7)API分组限流

新建API分组

添加流控规则

测试代码下载：
https://github.com/xjs1919/enumdemo/tree/master/gateway-sentinel-demo