eureka-demo 聚合工程。SpringBoot 2.2.4.RELEASE、Spring Cloud Hoxton.SR1。
创建项目
我们创建聚合项目来讲解 Eureka，首先创建一个 pom 父工程。
添加依赖
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>
<pre spellcheck="false" class="md-fences md-end-block ty-contain-cm modeLoaded" lang="" contenteditable="false" cid="n21" mdtype="fences" style="box-sizing: border-box; overflow: visible; font-family: var(--monospace); font-size: 0.9rem; display: block; break-inside: avoid; text-align: left; white-space: normal; background-image: inherit; background-position: inherit; background-size: inherit; background-repeat: inherit; background-attachment: inherit; background-origin: inherit; background-clip: inherit; background-color: rgb(255, 255, 255); position: relative !important; width: inherit; color: rgb(51, 51, 51); font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial;">
<groupId>com.example</groupId>
<artifactId>eureka-demo</artifactId>
<version>1.0-SNAPSHOT</version>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.2.4.RELEASE</version>
</parent>
<properties>
<spring-cloud.version>Hoxton.SR1</spring-cloud.version>
</properties>
<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></pre>
</project>
注册中心 eureka-server
在刚才的父工程下创建 eureka-server 注册中心的项目。
创建项目
添加依赖
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>
<pre spellcheck="false" class="md-fences md-end-block ty-contain-cm modeLoaded" lang="" contenteditable="false" cid="n58" mdtype="fences" style="box-sizing: border-box; overflow: visible; font-family: var(--monospace); font-size: 0.9rem; display: block; break-inside: avoid; text-align: left; white-space: normal; background-image: inherit; background-position: inherit; background-size: inherit; background-repeat: inherit; background-attachment: inherit; background-origin: inherit; background-clip: inherit; background-color: rgb(255, 255, 255); position: relative !important; width: inherit; color: rgb(51, 51, 51); font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial;"><groupId>com.example</groupId>
<artifactId>eureka-server</artifactId>
<version>1.0-SNAPSHOT</version>
<parent>
<groupId>com.example</groupId>
<artifactId>eureka-demo</artifactId>
<version>1.0-SNAPSHOT</version>
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-server</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>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
</exclusions>
</dependency>
</dependencies></pre>
</project>
配置文件
application.yml
server: port: 8761 # 端口
spring: application: name: eureka-server # 应用名称
配置 Eureka Server 注册中心
eureka: instance: hostname: localhost # 主机名，不配置的时候将根据操作系统的主机名来获取 client: register-with-eureka: false # 是否将自己注册到注册中心，默认为 true fetch-registry: false # 是否从注册中心获取服务注册信息，默认为 true service-url: # 注册中心对外暴露的注册地址 defaultZone: http://{server.port}/eureka/
此时如果直接启动项目是会报错的，错误信息：com.sun.jersey.api.client.ClientHandlerException: java.net.ConnectException: Connection refused: connect
，这是因为 Eureka 默认开启了将自己注册至注册中心和从注册中心获取服务注册信息的配置，如果该应用的角色是注册中心并是单节点的话，要关闭这两个配置项。
启动类
EurekaServerApplication.java
package com.example;
import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;
@SpringBootApplication // 开启 EurekaServer 注解 @EnableEurekaServer public class EurekaServerApplication {
<pre spellcheck="false" class="md-fences md-end-block ty-contain-cm modeLoaded" lang="" contenteditable="false" cid="n86" mdtype="fences" style="box-sizing: border-box; overflow: visible; font-family: var(--monospace); font-size: 0.9rem; display: block; break-inside: avoid; text-align: left; white-space: normal; background-image: inherit; background-position: inherit; background-size: inherit; background-repeat: inherit; background-attachment: inherit; background-origin: inherit; background-clip: inherit; background-color: rgb(255, 255, 255); position: relative !important; width: inherit; color: rgb(51, 51, 51); font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial;">public static void main(String[] args) {
SpringApplication.run(EurekaServerApplication.class, args);
}</pre>
}
访问
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