springCloud Eureka服务消费者-Ribbon(Finchley版本)

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妹子

EurekaClient ribbon服务消费(Finchley.RELEASE)

ribbon 是一个客户端负载均衡器，可以简单的理解成类似于 nginx的负载均衡模块的功能。

准备工作

  1. 启动注册中心EurekaServer
  2. 启动服务端Eureka-privider
  3. 将服务端Eureka-privider端口改为9001, 再启动一个实例

启动后, 可以看到服务端有两个实例在运行, 准备工作结束了, 进入主题哦

代码示例

POM.XML

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<?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.example</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>demo</name>
    <description>cloud consume project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.5.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
        <spring-cloud.version>Finchley.RELEASE</spring-cloud.version>
    </properties>

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

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</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>

application.yml

  1. 设置端口为9000
  2. 设置注册中心地址为http://localhost:8761/eureka/
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    server:
      port: 1001

    spring:
      application:
        name: Erueka-consume-ribbon

    eureka:
      client:
        # 从eureka服务器注册表中获取注册信息的时间间隔（s），默认为30秒
        registry-fetch-interval-seconds: 5
        serviceUrl:
          # 注册中心地址
          defaultZone: http://localhost:8761/eureka/

启动类

  1. 添加@LoadBalanced 为TestTemplate开启负载均衡的能力
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    @SpringBootApplication
    @EnableDiscoveryClient
    public class DemoApplication {

        /**
         * 实例化RestTemplate，通过@LoadBalanced注解开启均衡负载能力.
         * @return restTemplate
         */
        @Bean
        @LoadBalanced
        public RestTemplate restTemplate() {
            return new RestTemplate();
        }

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

消费hi服务

请求服务端的hi接口

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@RestController
public class TestController {

    @Autowired
    RestTemplate restTemplate;

    @GetMapping("/consumer")
    public String consumer() {
        // get 请求   getForEntity
        // post 请求  postForEntity
        return restTemplate.getForEntity("http://spring-cloud-producer/hi", String.class).getBody();
    }

}

测试

访问http://localhost:1001/consumer, 返回hi I am clouc-producer, i am from port:9000, 说明调用接口正常

最后福利啦

妹子又喊我写代码了,拜拜