1.下載Sentinel.jar可以圖形界面配置限流和降級規(guī)則
地址:可能需要翻墻
下載jar文件
2.引入maven依賴

   <!--    spring cloud gateway整合sentinel的依賴-->
   <dependency>
       <groupId>com.alibaba.cloud</groupId>
       <artifactId>spring-cloud-alibaba-sentinel-gateway</artifactId>
       <version>2.2.2.RELEASE</version>
   </dependency>

   <!--    sentinel的依賴-->
   <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.寫個自動注入Resource的過濾器類(可以不寫注解直接使用)

@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.寫配置文件 application.properties

# 服務(wù)端口
server.port=80
# 服務(wù)名
spring.application.name=service-gateway
#服務(wù)熔斷
spring.cloud.sentinel.transport.dashboard=localhost:18080
# nacos服務(wù)地址
spring.cloud.nacos.discovery.server-addr=192.168.56.1:8848
spring.main.allow-bean-definition-overriding=true
spring.profiles.active=dev

#使用服務(wù)發(fā)現(xiàn)路由
spring.cloud.gateway.discovery.locator.enabled=true

#設(shè)置路由id
spring.cloud.gateway.routes[0].id=service-cmn
#設(shè)置路由的uri
spring.cloud.gateway.routes[0].uri=lb://service-cmn
#設(shè)置路由斷言,代理servicerId為auth-service的/auth/路徑
spring.cloud.gateway.routes[0].predicates= Path=/*/cmn/**

5.cmd命令行啟動jar文件訪問localhost:18080頁面,自己設(shè)置QPS
java -jar -server.port=18080 sentinel-dashboard.jar


--------不在微服務(wù)中使用,在普通springboot也可以使用--------
1.maven依賴

  <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中寫

@Service

public class UserService { 
	//不可以用在類上
    @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 {

    @Autowired
    UserService userService;

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

3.sentinel控制臺查看

//快速訪問
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