1.简单代码

1.1依赖

SpringBoot 2.3.12.RELEASE
SpringCloudAlibaba 2.2.8.RELEASE

 		<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
        </dependency>
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
        </dependency>

        <dependency>
            <groupId>com.alibaba.csp</groupId>
            <artifactId>sentinel-datasource-nacos</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

1.2配置文件配置

删除项目的.properties文件改为bootstrap.yml文件

1.2.1项目yml配置文件

spring:
  application:
    name: springcloud-sentinel
  cloud:
    nacos:
      config:
        server-addr: 127.0.0.1:8848
        namespace: config
        file-extension: yaml
        group: DEFAULT_GROUP
      discovery:
        server-addr: 127.0.0.1:8848
    bootstrap:
      enabled: true
#  profiles:
#    active: dev

1.2.2nacos配置文件

server:
    port: 8085

spring:
  application.name: springcloud-sentinel
  cloud:
   sentinel:
      transport.dashboard: localhost:8080
      datasource:
        ds.nacos:
              username: nacos
              password: nacos
              ruleType: flow
              groupId: DEFAULT_GROUP
              dataId: ${spring.application.name}
              server-addr : localhost:8848

1.2controller

@RequestMapping("/test")
@RestController
public class HelloController {

    @Autowired
    private TestService service;

    @GetMapping("/hello/{name}")
    public String hello(@PathVariable String name){

        return service.sayHello(name);
    }
}

1.3 service

@Service
public class TestService {
    @SentinelResource(value = "sayHello")
    public String sayHello(String name) {
        return "Hello, " + name;
    }
}