这篇文章主要通过DEMO的方式启动一个微服务，并将服务注册到Eureka Server. Eureka Server为本地启动的服务信息，可以通过之前的文章查看启动过程，以及启动原理。
POM配置
pom配置主要配置了启动需要的依赖包信息, 具体代码如下：
<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<parent>
<artifactId>spring-cloud</artifactId>
<groupId>org.example</groupId>
<version>1.0-SNAPSHOT</version>
<relativePath>../pom.xml</relativePath>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>spring-cloud-eureka-client</artifactId>
<properties>
<maven.compiler.source>8</maven.compiler.source>
<maven.compiler.target>8</maven.compiler.target>
</properties>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-dependencies</artifactId>
<version>2.1.12.RELEASE</version>
<type>pom</type>
<scope>import</scope>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>Greenwich.SR5</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-netflix-eureka-client</artifactId>
</dependency>
<!-- <dependency>-->
<!-- <groupId>org.springframework.cloud</groupId>-->
<!-- <artifactId>spring-cloud-netflix-ribbon</artifactId>-->
<!-- </dependency>-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-autoconfigure</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-context</artifactId>
</dependency>
<dependency>
<groupId>com.netflix.eureka</groupId>
<artifactId>eureka-client</artifactId>
</dependency>
<dependency>
<groupId>com.netflix.eureka</groupId>
<artifactId>eureka-core</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-commons</artifactId>
</dependency>
</dependencies>
</project>
服务配置
spring:
cloud:
discovery:
enabled: true
application:
name: spring-eureka-client
main:
allow-bean-definition-overriding: true
server:
port: 8080
eureka:
client:
service-url:
defaultZone: http://localhost:8761/eureka/
启动服务
package org.spring.learn.eureka.client;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
@SpringBootApplication
@EnableDiscoveryClient
public class SpringEurekaClientDemoApplication {
public static void main(String[] args) {
SpringApplication.run(SpringEurekaClientDemoApplication.class, args);
}
}
在源码中，有两种方式启动eureka, 可以通过:
@EnableEurekaClient注解的方式启动，这种方式主要是针对Eureka提供的注解方式@EanbleDiscoveryClient注解方式启动, 是作为一个通用的方式启动的, 可以针对其他的注册发现组件启动- 其实不加注解也是可以启用的，因为
EurekaClientAutoConfiguration类默认是根据properties配置启动，后续章节将会介绍
查看日志
2021-09-04 16:31:25.775 INFO 13272 --- [ main] com.netflix.discovery.DiscoveryClient : Initializing Eureka in region us-east-1 2021-09-04 16:31:26.801 INFO 13272 --- [ main] c.n.d.provider.DiscoveryJerseyProvider : Using JSON encoding codec LegacyJacksonJson 2021-09-04 16:31:26.801 INFO 13272 --- [ main] c.n.d.provider.DiscoveryJerseyProvider : Using JSON decoding codec LegacyJacksonJson 2021-09-04 16:31:26.895 INFO 13272 --- [ main] c.n.d.provider.DiscoveryJerseyProvider : Using XML encoding codec XStreamXml 2021-09-04 16:31:26.895 INFO 13272 --- [ main] c.n.d.provider.DiscoveryJerseyProvider : Using XML decoding codec XStreamXml 2021-09-04 16:31:27.084 INFO 13272 --- [ main] c.n.d.s.r.aws.ConfigClusterResolver : Resolving eureka endpoints via configuration 2021-09-04 16:31:27.892 INFO 13272 --- [ main] com.netflix.discovery.DiscoveryClient : Disable delta property : false 2021-09-04 16:31:27.892 INFO 13272 --- [ main] com.netflix.discovery.DiscoveryClient : Single vip registry refresh property : null 2021-09-04 16:31:27.892 INFO 13272 --- [ main] com.netflix.discovery.DiscoveryClient : Force full registry fetch : false 2021-09-04 16:31:27.892 INFO 13272 --- [ main] com.netflix.discovery.DiscoveryClient : Application is null : false 2021-09-04 16:31:27.892 INFO 13272 --- [ main] com.netflix.discovery.DiscoveryClient : Registered Applications size is zero : true 2021-09-04 16:31:27.892 INFO 13272 --- [ main] com.netflix.discovery.DiscoveryClient : Application version is -1: true 2021-09-04 16:31:27.892 INFO 13272 --- [ main] com.netflix.discovery.DiscoveryClient : Getting all instance registry info from the eureka server 2021-09-04 16:31:28.258 INFO 13272 --- [ main] com.netflix.discovery.DiscoveryClient : The response status is 200 2021-09-04 16:31:28.258 INFO 13272 --- [ main] com.netflix.discovery.DiscoveryClient : Starting heartbeat executor: renew interval is: 30 2021-09-04 16:31:28.258 INFO 13272 --- [ main] c.n.discovery.InstanceInfoReplicator : InstanceInfoReplicator onDemand update allowed rate per min is 4 2021-09-04 16:31:28.258 INFO 13272 --- [ main] com.netflix.discovery.DiscoveryClient : Discovery Client initialized at timestamp 1630744288258 with initial instances count: 0 2021-09-04 16:31:28.258 INFO 13272 --- [ main] o.s.c.n.e.s.EurekaServiceRegistry : Registering application SPRING-EUREKA-CLIENT with eureka with status UP 2021-09-04 16:31:28.258 INFO 13272 --- [ main] com.netflix.discovery.DiscoveryClient : Saw local status change event StatusChangeEvent [timestamp=1630744288258, current=UP, previous=STARTING] 2021-09-04 16:31:28.258 INFO 13272 --- [nfoReplicator-0] com.netflix.discovery.DiscoveryClient : DiscoveryClient_SPRING-EUREKA-CLIENT/windows10.microdone.cn:spring-eureka-client:8080: registering service... 2021-09-04 16:31:28.305 INFO 13272 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path '' 2021-09-04 16:31:28.321 INFO 13272 --- [ main] .s.c.n.e.s.EurekaAutoServiceRegistration : Updating port to 8080 2021-09-04 16:31:28.399 INFO 13272 --- [nfoReplicator-0] com.netflix.discovery.DiscoveryClient : DiscoveryClient_SPRING-EUREKA-CLIENT/windows10.microdone.cn:spring-eureka-client:8080 - registration status: 204 2021-09-04 16:31:29.868 INFO 13272 --- [ main] .l.e.c.SpringEurekaClientDemoApplication : Started SpringEurekaClientDemoApplication in 12.467 seconds (JVM running for 14.206)
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