springcloud(Brixton版) EurekaServer Ribbon

曾经终败给现在 2023-08-17 16:26 123阅读 0赞

序：**Feign集成了Ribbon。Ribbon+eureka是面向微服务编程，而Feign是面向接口编程。**

**Ribbon  
是一个基于 HTTP 和 TCP 客户端 的负载均衡的工具。  
它可以 在客户端 配置 RibbonServerList（服务端列表），使用 HttpClient 或 RestTemplate 模拟http请求，步骤相当繁琐。**

**Feign  
Feign 是在 Ribbon的基础上进行了一次改进，是一个使用起来更加方便的 HTTP 客户端。**

**采用接口的方式， 只需要创建一个接口，然后在上面添加注解即可 ，将需要调用的其他服务的方法定义成抽象方法即可， 不需要自己构建http请求。**

**然后就像是调用自身工程的方法调用，而感觉不到是调用远程方法，使得编写 客户端变得非常容易。**

1.创建springboot项目。

2.pom.xml

<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
       <modelVersion>4.0.0</modelVersion>
    
       <groupId>com.didispace</groupId>
       <artifactId>eureka-ribbon</artifactId>
       <version>1.0.0</version>
       <packaging>jar</packaging>
    
       <name>eureka-ribbon</name>
       <description>Spring Cloud project</description>
    
       <parent>
          <groupId>org.springframework.boot</groupId>
          <artifactId>spring-boot-starter-parent</artifactId>
          <version>1.3.5.RELEASE</version>
          <relativePath/> 
       </parent>
    
       <properties>
          <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
          <java.version>1.8</java.version>
       </properties>
    
       <dependencies>
          <dependency>
             <groupId>org.springframework.cloud</groupId>
             <artifactId>spring-cloud-starter-ribbon</artifactId>
          </dependency>
          <dependency>
             <groupId>org.springframework.cloud</groupId>
             <artifactId>spring-cloud-starter-eureka</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-test</artifactId>
             <scope>test</scope>
          </dependency>
       </dependencies>
    
       <dependencyManagement>
          <dependencies>
             <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Brixton.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
             </dependency>
          </dependencies>
       </dependencyManagement>
    
       <build>
          <plugins>
             <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
             </plugin>
          </plugins>
       </build>
    
    </project>

3.application.properties

spring.application.name=ribbon-consumer
    server.port=3333
    eureka.client.serviceUrl.defaultZone=http://localhost:1111/eureka/

4.controller

import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RequestMethod;
    import org.springframework.web.bind.annotation.RestController;
    import org.springframework.web.client.RestTemplate;
    
    @RestController
    public class ConsumerController {
    
        @Autowired
        RestTemplate restTemplate;
    
        @RequestMapping(value = "/add", method = RequestMethod.GET)
        public String add() {
            return restTemplate.getForEntity("http://COMPUTE-SERVICE/add?a=10&b=20", String.class).getBody();
        }
    
    }

5.启动类

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.context.annotation.Bean;
    import org.springframework.web.client.RestTemplate;
    
    @SpringBootApplication
    @EnableDiscoveryClient
    public class RibbonApplication {
    
       @Bean
       @LoadBalanced
       RestTemplate restTemplate() {
          return new RestTemplate();
       }
    
       public static void main(String[] args) {
          SpringApplication.run(RibbonApplication.class, args);
       }
    
    }

6.[http://localhost:1111/][http_localhost_1111] 将服务已经注册到了EurekaServer 上，**RIBBON其实就是调用部署在eureka服务上的其他微服务的地址进行负载均衡。**

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[http_localhost_1111]: http://localhost:1111/
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