Spring Cloud（五）Ribbon实战

迷南。 2022-12-15 11:04 154阅读 0赞

## 前期准备 ##

1、创建一个Eureka Server工程，`项目名称：eureka-server`

2、创建一个Eureka Client 服务提供者 工程，`项目名称：eureka-client1`

工程eureka-server和eureka-client1 创建请参考

[Spring Cloud（三）Eureka实战][Spring Cloud_Eureka]

## 1、启动Eureka 服务提供者、Eureka注册中心 ##

启动`eureka-server`、eureka-client1

PS：eureka-client1 在idea中通过多实例启动，

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI5OTE0ODM3_size_16_color_FFFFFF_t_70_pic_center]  
查看 Eureka 控制台

![在这里插入图片描述][20201015222111695.png_pic_center]

## 2、创建并启动服务消费者 ##

项目名称：service-ribbon

<?xml version="1.0" encoding="UTF-8"?>
    <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
        <modelVersion>4.0.0</modelVersion>
    
        <groupId>com.yi</groupId>
        <artifactId>service-ribbon</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <packaging>jar</packaging>
        <name>service-ribbon</name>
        <description>服务消费者</description>
    
        <parent>
            <groupId>com.yi</groupId>
            <artifactId>finchley</artifactId>
            <version>0.0.1-SNAPSHOT</version>
        </parent>
    
        <dependencies>
            <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.cloud</groupId>
                <artifactId>spring-cloud-starter-netflix-ribbon</artifactId>
            </dependency>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-netflix-hystrix</artifactId>
            </dependency>
        </dependencies>
    
    </project>

eureka:
      client:
        serviceUrl:
          defaultZone: http://localhost:8761/eureka/
    server:
      port: 8764
    spring:
      application:
        name: service-ribbon

package com.yi.serviceribbon;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
    import org.springframework.cloud.client.loadbalancer.LoadBalanced;
    import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
    import org.springframework.cloud.netflix.hystrix.EnableHystrix;
    import org.springframework.context.annotation.Bean;
    import org.springframework.web.client.RestTemplate;
    
    @SpringBootApplication
    @EnableEurekaClient
    @EnableDiscoveryClient
    @EnableHystrix
    public class ServiceRibbonApplication {
    
        public static void main(String[] args) {
            SpringApplication.run(ServiceRibbonApplication.class, args);
        }
    
        @Bean
        @LoadBalanced
        RestTemplate restTemplate() {
            return new RestTemplate();
        }
    }

> @EnableDiscoveryClient向服务中心注册  
> @Bean注入一个bean: restTemplate;  
> @LoadBalanced为restRemplate开启负载均衡功能

调用服务提供方提供的服务

package com.yi.serviceribbon;
    
    import com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Service;
    import org.springframework.web.client.RestTemplate;
    
    /**
     * @author yi
     * @version 1.0
     * @description TODO
     * @className HelloService
     **/
    @Service
    public class HelloWorldService {
    
        @Autowired
        RestTemplate restTemplate;
    
        public String hello( ) {
            return restTemplate.getForObject("http://service-client/hello?name=yi",String.class);
        }
    }
    
    
    @RestController
    public class HelloWorldControler {
    
        @Autowired
        HelloWorldService helloWorldService;
    
        @GetMapping(value = "/helloWorld")
        public String helloWorld( ) {
            return helloWorldService.hello( );
        }
    }

Ribbon 默认负载均衡算法是轮询

hello yi ，port is 8762
    hello yi ，port is 8763

--------------------

git项目源码：[https://github.com/yilei111/-Spring-Cloud-Finchley][https_github.com_yilei111_-Spring-Cloud-Finchley]

[Spring Cloud_Eureka]: https://blog.csdn.net/qq_29914837/article/details/109085405
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI5OTE0ODM3_size_16_color_FFFFFF_t_70_pic_center]: /images/20221123/4a47742712b44b3290610afe7c309be4.png
[20201015222111695.png_pic_center]: /images/20221123/66b5096b3b38493d9012bc5875932611.png
[https_github.com_yilei111_-Spring-Cloud-Finchley]: https://github.com/yilei111/-Spring-Cloud-Finchley