43、Sentinel 流量防卫兵

1、下载安装：java -jar sentinel-dashboard-1.7.2.jar 启动Sentinel 访问：localhost:8080 进入Sentinel 控制台

2、创建 cloundalibaba-sentinel-service8014

编写pom.xml

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

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>

        <dependency>
            <groupId>com.atguigu.springcloud</groupId>
            <artifactId>cloud-api-commons</artifactId>
            <version>${project.version}</version>
        </dependency>
    </dependencies>

编写application.yml 配置文件

spring:
  application:
    name: cloudalibaba-sentinel-service
  cloud:
    nacos:
      discovery:
        server-addr: 8.129.215.115:8848
    sentinel:
      transport:
        port: 8720
        dashboard: localhost:8080

server:
  port: 8401

feign:
  sentinel:
    enabled: true

management:
  endpoints:
    web:
      exposure:
        include: "*"

编写主启动类

@SpringBootApplication
@EnableDiscoveryClient
public class SentinelApplication8401 {
    public static void main(String[] args) {
        SpringApplication.run(SentinelApplication8401.class, args);
    }
}

编写业务类

@RestController
public class SentinelController {

    @GetMapping(value = "testA")
    public String testA () {
        return "++++++++++++testA";
    }

    @GetMapping(value = "testB")
    public String testB () {
        return "++++++++++++testB";
    }
}