springCloud项目结合Eureka搭建OpenFeign负载均衡

OpenFeign负载均衡实践

最新推荐文章于 2025-09-08 16:00:16 发布

原创最新推荐文章于 2025-09-08 16:00:16 发布 · 322 阅读

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本文详细介绍如何通过OpenFeign实现微服务之间的负载均衡。包括配置pom文件引入依赖、设置application.yml参数、使用@EnableFeignClients注解激活Feign、创建Service接口以及Controller等步骤。

1.首先配置模块的pom文件,引入openFeign

<dependencies>
    <!--openfeign-->
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-openfeign</artifactId>
    </dependency>
    <!--eureka-client 已经集成了ribbon复杂均衡-->
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-netflix-eureka-client</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>
    <!--热部署-->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-devtools</artifactId>
        <scope>runtime</scope>
        <optional>true</optional>
    </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>
</dependencies>

2.配置application.yml文件

server:
  port: 80

eureka:
  client:
    #true表示将自己注册进eureka server
    register-with-eureka: false
    #true默认值,从eureka server抓取已有的注册信息,单节点无所谓,集群必须设置为true才能配合ribbon使用负载均衡
    fetch-registry: true
    service-url:
      #defaultZone: http://localhost:7001/eureka/
      defaultZone: http://eureka7001.com:7001/eureka,http://eureka7002.com:7002/eureka,http://eureka7003.com:7003/eureka
  #配置主机名称
  instance:
    instance-id: consumerfeignorder80
    prefer-ip-address: true

3.主启动类,必须使用@EnableFeignClients注解,激活feign

@SpringBootApplication
@EnableFeignClients//使用feign并开启激活
public class ConsumerFeignOrderMain {
    public static void main(String[] args) {
            SpringApplication.run(ConsumerFeignOrderMain.class,args);
        }
}

4.新建一个service接口
openFeign是基于接口调用微服务的,所以在业务接口添加注解@FeignClient并制定微服务的名称,以此来实现负载均衡调用

@ComponentScan
@FeignClient(value = "CLOUD-PAYMENT-SERVICE")
public interface PaymentFeignService {

    @GetMapping("/payment/get/{id}")
    CommonResult<Payment> getPaymentById(@PathVariable("id") Long id);
}

5.新建controller调用service

@RestController
@Slf4j
public class OrderFeignController {

    @Resource
    private PaymentFeignService paymentFeignService;

    @GetMapping("/consumer/payment/get/{id}")
    public CommonResult<Payment> getPaymentById(@PathVariable("id") Long id){
        return paymentFeignService.getPaymentById(id);
    }
}