新建工程

新建SpringBoot工程eureka-client， 其pom.xml文件配置如下

<?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>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.2.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.springcloud.bh</groupId>
    <artifactId>eureka-client</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>eureka-client</name>
    <description>eureka服务提供者</description>

    <properties>
        <java.version>1.8</java.version>
        <spring-cloud.version>Hoxton.RELEASE</spring-cloud.version>
    </properties>

    <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-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-autoconfigure</artifactId>
            <version>2.2.2.RELEASE</version>
        </dependency>

        <!--必须要此依赖否则启动不起来项目-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </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>

配置application.yml

当Client向Server注册时，它会提供一些元数据，例如主机和端口，URL，主页等，Eureka Server从每个Client实例接收心跳消息， 如果心跳超时，则通常将该实例从Server中删除。

server:
  port: 8762  #设置端口号，使用ribbon实现负载均衡

spring:
  application:
    name: eureka-client   #指定微服务的名称，后续在调用的时候只需要使用该名称就可以进行服务的访问

eureka:
  client:
    service-url:
      defaultZone: http://localhost:8761/eureka/   #属性对应服务注册中心的配置内容，指定服务注册中心的位置

Application

添加注解@EnableEurekaClient，表明自己是一个Eureka Client。

package com.springcloud.bh;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

@EnableEurekaClient
@SpringBootApplication
public class EurekaClientApplication {

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

AdminController

新建AdminController类,作为服务提供者提供接口服务。

package com.springcloud.bh.controller;

import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class AdminController {

    @Value("${server.port}")
    private String port;

    @GetMapping("hi")
    public String sayHi(String message)
    {
        return String.format("你的消息是：%s  端口号：%s",message,port);
    }
}

启动多个实例

在Run/Debug Congigurations中选中Eureka Client,勾选Allow parallel run，表示允许运行多个实例。在application.yml中修改server.port来改变多个实例的运行端口。

打开浏览器访问http://localhost:8761 ，查看服务注册中心，可以看到Eureka Clien服务提供者注册了多个实例。

源码地址

Github: https://github.com/yeshang5/springcloud-example

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