springCloud集成Sentinel进行限流

1、首先创建一个ParentMoudle的java pom文件项目进行服务项目管理,其中要注意的是需要将配置成如下的dependencyManagement格式,否则子项目会报错;

<dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Greenwich.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
</dependencyManagement>

2、依次创建eurekaServer、provider、feignClient(主要是对外暴露),每个项目的parent设置成如下格式

   <parent>
        <groupId>com.yangfan</groupId>
        <artifactId>springcloud_feign_parent</artifactId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>
  • 创建eurekaserver项目

        1⃣️pom文件中引入spring-cloud-starter-netflix-eureka-server

<dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
            <version>2.1.0.RELEASE</version>
        </dependency>
</dependencies>

       2⃣️ 配置yml文件:核心是设置eurekaClient的注册中心的地址

server:
  port: 9010

spring:
  application:
    name: eureka-server

eureka:
  client:
    service-url:
      #eureka 服务地址,如果是集群的话;需要指定其他集群eureka地址
      defaultZone: http://127.0.0.1:9010/eureka
      # 不注册自己
    registry-with-eureka: false
    #不拉服务
    fetch-registry: false

3⃣️在启动类中开启@EnableEurekaServer注解,开启eurekaServer服务

@SpringBootApplication
@EnableEurekaServer
public class EurekaServerApplication {

    public static void main(String[] args) {
        SpringApplication.run(EurekaServerApplication.class, args);
    }

}
  • 创建provider项目

1⃣️项目引入spring-boot-starter-web项目、spring-cloud-starter-netfix-eureka-client依赖

 <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!--eureka客户端依赖-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
            <version>2.1.0.RELEASE</version>
        </dependency>
    </dependencies>

2⃣️设置eurekaServer的注册地址为:http://127.0.0.1:9010/eureka

server:
  port: 9011

spring:
  application:
    name: sentinel-feign-provider

eureka:
  client:
    service-url:
      #eureka 服务地址,如果是集群的话;需要指定其他集群eureka地址
      defaultZone: http://127.0.0.1:9010/eureka #需要注册到注册中心的地址
      # 不注册自己

3⃣️在启动类中开启@EnableEurekaClient注解,表示开启Eureka客户端发现功能

@EnableEurekaClient //开启Eureka客户端发现功能
@SpringBootApplication
public class SentinelFeignProviderApplication {

    public static void main(String[] args) {
        SpringApplication.run(SentinelFeignProviderApplication.class, args);
    }

}
  • 创将feign项目

1⃣️项目中引入spring-cloud-starter-netfix-eureka-client依赖、feign的起步依赖spring-cloud-starter-openfeign、sentinel依赖spring-cloud-starter-alibaba-sentinel

 <dependencies>

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

        <!--eureka客户端依赖-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
            <version>2.1.0.RELEASE</version>
        </dependency>

        <!--feign的起步依赖-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
            <version>2.1.0.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
            <version>2.1.0.RELEASE</version>
        </dependency>
    </dependencies>

2⃣️yml文件配置:开启sentinel对feign的支持、设置sentinel本地的dashboard地址、向eureka注册中心注册feign服务

server:
  port: 9012

spring:
  application:
    name: sentinel-feign-client
  cloud:
    sentinel:
      transport:
        dashboard: localhost:9000 #开启 sentinel对feign的支持
#激活sentinel的支持
feign:
  sentinel:
    enabled: true

eureka:
  client:
    service-url:
      #eureka 服务地址,如果是集群的话;需要指定其他集群eureka地址
      defaultZone: http://127.0.0.1:9010/eureka #需要注册到注册中心的地址
      # 不注册自己

3⃣️开启@EnableEurekaClient 注解表示向注册中心注册自己@EnableFeignClients表示开启FeignClient服务

@SpringBootApplication
@EnableEurekaClient
@EnableFeignClients
public class SentinelFeignClientApplication {

    public static void main(String[] args) {
        SpringApplication.run(SentinelFeignClientApplication.class, args);
    }

}

 4⃣️创建一个FallbackService实现自FeignAgent并实现hello方法

@Component
public class FallbackService implements FeignAgent {
    @Override
    public String hello() {
        return "系统繁忙请稍后!";
    }
}

5⃣️在Feign中新建一个Controller,并引入FeignClient,在hello方法中调用feign的hello方法

@RestController
public class TestController {

    @Autowired
    private FeignAgent feignAgent;

    @GetMapping("/hello")
    public String hello(){
        return feignAgent.hello();
    }
}

6⃣️配置sentinel dashboard的流控规则,流控规则的编写形式为:http:请求方式:协议://服务名/请求路径跟参数 (GET:http://sentinel-feign-provider/hello)

最终效果如下

 

 

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转载自blog.csdn.net/weixin_38829588/article/details/123614102