服务注册：Eureka Client

服务注册

当客户端在Eureka注册时，它会提供有关自身的元数据 — 例如主机、端口、（health indicator URL）健康指示器URL、home page和其他详细信息。Eureka从属于某个服务的每个实例接收心跳消息。如果心跳在指定时间内失败，则通常会从注册表中删除该实例。

1. 基础环境

JDK21
Spring boot 3.5.3
Spring cloud 2025.0.0

2. 引入依赖

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>

完整pom

<?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>3.5.3</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>
	<groupId>com.example</groupId>
	<artifactId>eureka-client</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>eureka-client</name>
	<description>Demo project for Spring Boot</description>
	<properties>
		<java.version>21</java.version>
		<spring-cloud.version>2025.0.0</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.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>

3. application配置文件

spring:
  application:
    name: eureka-client
server:
  port: 8081
eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/

只需要引入上面的依赖，并且配置eureka server的地址，那么应用在启动时就会自动注册到eureka。

defaultZone属性区分大小写，需要驼峰大小写，因为serviceUrl属性是Map<String，String>。因此，defaultZone属性不遵循Spring Boot snake-case 约定。不能写为default-zone。