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1.下载Sentinel.jar可以图形界面配置限流和降级规则
地址:可能需要翻墙
下载jar文件
2.引入maven依赖

   <!--    spring cloud gateway整合sentinel的依赖--><dependency><groupId>com.alibaba.cloud</groupId><artifactId>spring-cloud-alibaba-sentinel-gateway</artifactId><version>2.2.2.RELEASE</version></dependency><!--    sentinel的依赖--><dependency><groupId>com.alibaba.cloud</groupId><artifactId>spring-cloud-starter-alibaba-sentinel</artifactId><version>2.2.2.RELEASE</version></dependency><dependency><groupId>com.alibaba.csp</groupId><artifactId>sentinel-spring-cloud-gateway-adapter</artifactId><version>1.8.0</version></dependency>

3.写个自动注入Resource的过滤器类(可以不写注解直接使用)

@Configuration
public class GatewayConfiguration {private final List<ViewResolver> viewResolvers;private final ServerCodecConfigurer serverCodecConfigurer;public GatewayConfiguration(ObjectProvider<List<ViewResolver>> viewResolversProvider,ServerCodecConfigurer serverCodecConfigurer) {this.viewResolvers = viewResolversProvider.getIfAvailable(Collections::emptyList);this.serverCodecConfigurer = serverCodecConfigurer;}@Bean@Order(Ordered.HIGHEST_PRECEDENCE)public SentinelGatewayBlockExceptionHandler sentinelGatewayBlockExceptionHandler() {// Register the block exception handler for Spring Cloud Gateway.return new SentinelGatewayBlockExceptionHandler(viewResolvers, serverCodecConfigurer);}@Bean@Order(Ordered.HIGHEST_PRECEDENCE)public GlobalFilter sentinelGatewayFilter() {return new SentinelGatewayFilter();}
}

4.写配置文件 application.properties

# 服务端口
server.port=80
# 服务名
spring.application.name=service-gateway
#服务熔断
spring.cloud.sentinel.transport.dashboard=localhost:18080
# nacos服务地址
spring.cloud.nacos.discovery.server-addr=192.168.56.1:8848
spring.main.allow-bean-definition-overriding=true
spring.profiles.active=dev#使用服务发现路由
spring.cloud.gateway.discovery.locator.enabled=true#设置路由id
spring.cloud.gateway.routes[0].id=service-cmn
#设置路由的uri
spring.cloud.gateway.routes[0].uri=lb://service-cmn
#设置路由断言,代理servicerId为auth-service的/auth/路径
spring.cloud.gateway.routes[0].predicates= Path=/*/cmn/**

5.cmd命令行启动jar文件访问localhost:18080页面,自己设置QPS
java -jar -server.port=18080 sentinel-dashboard.jar


--------不在微服务中使用,在普通springboot也可以使用--------
1.maven依赖

  <dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>com.alibaba.cloud</groupId><artifactId>spring-cloud-starter-alibaba-sentinel</artifactId></dependency><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><optional>true</optional></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency>

2.service中写

@Servicepublic class UserService { //不可以用在类上@SentinelResource(value = "sayHello",fallback = "sayHellofail")public String sayHello(){return "Hello,World";}public  String sayHellofail(){ //限流的方法return "I'am sorry";}}

3.controller

@RestController
public class UserController {@AutowiredUserService userService;@RequestMapping("/hello")public String hello(){return userService.sayHello();}
}

3.sentinel控制台查看

//快速访问