Spring Cloud Gateway集成sentinel进行网关限流

在Spring Cloud Gateway中集成Sentinel进行限流，你需要做以下几步：

1. 引入Sentinel依赖和Spring Cloud Alibaba Sentinel依赖。
2. 配置Sentinel的数据源，比如配置中心。
3. 配置Sentinel的API网关规则。

以下是一个基本的示例，演示如何在Spring Cloud Gateway中集成Sentinel进行限流：

pom.xml依赖（选择适合你项目的版本）:

<dependencies>
    <!-- Spring Cloud Gateway -->
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-gateway</artifactId>
    </dependency>
    <!-- Spring Cloud Alibaba Sentinel -->
    <dependency>
        <groupId>com.alibaba.cloud</groupId>
        <artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
    </dependency>
</dependencies>

application.yml配置:

spring:
  cloud:
    gateway:
      routes:
        - id: sentinel_route
          uri: http://localhost:8080
          predicates:
            - Path=/sentinel/**
    sentinel:
      filter:
        enabled: true

Sentinel限流规则配置:

你可以通过Sentinel控制台配置规则，或者通过API的方式动态配置。

启动类添加@EnableSentinel注解:

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import com.alibaba.csp.sentinel.annotation.aspectj.EnableSentinelResourceAspect;
import com.alibaba.cloud.sentinel.gateway.scg.SentinelGatewayFilter;
import com.alibaba.cloud.sentinel.gateway.scg.SentinelGatewayFilterFactory;
import org.springframework.context.annotation.Bean;
import com.alibaba.cloud.sentinel.SentinelProperties;
import com.alibaba.csp.sentinel.adapter.gateway.common.rule.GatewayFlowRule;
import com.alibaba.csp.sentinel.adapter.gateway.common.rule.GatewayRuleManager;
 
@SpringBootApplication
@EnableSentinelResourceAspect
public class SentinelGatewayApplication {
 
    public static void main(String[] args) {
        SpringApplication.run(SentinelGatewayApplication.class, args);
    }
 
    @Bean
    public SentinelGatewayFilter sentinelGatewayFilter() {
        return new SentinelGatewayFilter();
    }
 
    @Bean
    public SentinelProperties sentinelProperties() {
        return new SentinelProperties();
    }
 
    // 配置限流规则（示例）
    @PostConstruct
    public void initGatewayRules() {
        Set<GatewayFlowRule> rules = new HashSet<>();
        rules.add(new GatewayFlowRule("sentinel_route")
            .setCount(1)                   // 限流阈值
            .setIntervalSec(1));           // 统计时间窗口，单位