使用Ribbon实现Eureka的负载均衡

朴灿烈づ我的快乐病毒、 2022-12-21 02:23 125阅读 0赞

本篇接于[《SpringBoot：Eureka搭建注册中心》][SpringBoot_Eureka]和[《SpringBoot：Eureka创建服务消费者》][SpringBoot_Eureka 1]。

*  pom文件

<dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
    
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-ribbon</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>
    </dependencies>

*  Application

@SpringBootApplication
    @EnableDiscoveryClient
    public class RibbonConsumerApplication { 
    
        @Bean
        @LoadBalanced
        public RestTemplate template() { 
            return new RestTemplate();
        }
    
        public static void main(String[] args) { 
            new SpringApplicationBuilder(RibbonConsumerApplication.class)
                    .web(WebApplicationType.SERVLET)
                    .run(args);
        }
    
    }

*  配置文件

eureka:
      client:
        serviceUrl:
          defaultZone: http://localhost:20000/eureka/
    server:
      port: 31000
    spring:
      application:
        name: ribbon-consumer

*  测试Controller

@RestController
    public class Controller { 
    
        @Autowired
        private RestTemplate restTemplate;
    
        @GetMapping("/sayHi")
        public String sayHi() { 
            return restTemplate.getForObject(
                    "http://eureka-client/sayHi",
                    String.class);
        }
    
    }

我们EurekaServer，并在30001和30002两个端口上启动两个client，同时启动Ribbon  
![在这里插入图片描述][20201113163108625.png_pic_center]  
然后我们使用postman请求`localhost:31000/sayHi`接口，可以看到多次请求，返回结果会`This is 30001`和`This is 30002`  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2x0MzI2MDMwNDM0_size_16_color_FFFFFF_t_70_pic_center]  
![在这里插入图片描述][20201113163538235.png_pic_center]  
说明`@LoadBalanced`注解已经生效了！

[SpringBoot_Eureka]: https://jiandansuifeng.blog.csdn.net/article/details/109363552
[SpringBoot_Eureka 1]: https://jiandansuifeng.blog.csdn.net/article/details/109364666
[20201113163108625.png_pic_center]: /images/20221120/4317c9cd4b1b46979fc4ad6d32954fdd.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2x0MzI2MDMwNDM0_size_16_color_FFFFFF_t_70_pic_center]: /images/20221120/afa01139659f47f89df489da486a04b2.png
[20201113163538235.png_pic_center]: /images/20221120/9c580a6716b34a428d5c1f5a06d3f3ad.png