[Spring Cloud Netflix] 3 Eureka:服务注册与发现

服务注册与发现

Posted by Mr.Vincent on 2019-07-04
Estimated Reading Time 3 Minutes
Words 564 In Total
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概述

在这里,我们需要用的组件是 Spring Cloud NetflixEurekaEureka 是一个服务注册和发现模块

创建服务注册中心

其 pom.xml 文件配置如下:

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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>

<parent>
<groupId>com.example</groupId>
<artifactId>hello-spring-cloud-dependencies</artifactId>
<version>1.0.0-SNAPSHOT</version>
<relativePath>../hello-spring-cloud-dependencies/pom.xml</relativePath>
</parent>

<artifactId>hello-spring-cloud-eureka</artifactId>
<packaging>jar</packaging>

<name>hello-spring-cloud-eureka</name>
<url>http://wvincen.gitee.io</url>
<inceptionYear>2019-Now</inceptionYear>

<dependencies>
<!-- Spring Boot Begin -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<!-- Spring Boot End -->

<!-- Spring Cloud Begin -->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
</dependency>
<!-- Spring Cloud End -->
</dependencies>

<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<mainClass>com.example.hello.spring.cloud.eureka.EurekaApplication</mainClass>
</configuration>
</plugin>
</plugins>
</build>
</project>

Application

启动一个服务注册中心,只需要一个注解 @EnableEurekaServer

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package com.funtl.hello.spring.cloud.eureka;

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

@SpringBootApplication
@EnableEurekaServer
public class EurekaApplication {
public static void main(String[] args) {
SpringApplication.run(EurekaApplication.class, args);
}
}

application.yml

Eureka 是一个高可用的组件,它没有后端缓存,每一个实例注册之后需要向注册中心发送心跳(因此可以在内存中完成),在默认情况下 Erureka Server 也是一个 Eureka Client ,必须要指定一个 Server。

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spring:
application:
name: hello-spring-cloud-eureka

server:
port: 8761

eureka:
instance:
hostname: localhost
client:
registerWithEureka: false
fetchRegistry: false
serviceUrl:
defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/

通过 eureka.client.registerWithEureka:falsefetchRegistry:false 来表明自己是一个 Eureka Server.

操作界面


Eureka Server 是有界面的,启动工程,打开浏览器访问:http://localhost:8761

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案例源码:https://github.com/V-Vincen/hello-spring-cloud


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