SpringCloud五个常用组件(一) Netflix Eureka

SpringCloud五个常用组件(一) Netflix Eureka

作用

实现实现了服务治理，服务的注册与被发现。

组件

组件共分两类 Eureka服务端和Eureka客户端

定义

Eureka作为服务注册中心，支持集群部署

Eureka客户端时一个Java客户端，用来处理服务注册与发现

在应用启动时，Eureka客户端向服务端注册自己的服务信息，同时将服务端
的服务信息缓存到本地。客户端会和服务端周期性的进行心跳交互，以更新
服务租约和服务信息

实例

搭建一个Eureka Server服务，我使用的是IDEA

1.使用Spring Intialilzr创建Eureka Server

2.POM文件

<?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>

    <groupId>com.thunisoft</groupId>
    <artifactId>eureka</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>eureka</name>
    <description>微服务注册中心</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.1.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
        <spring-cloud.version>Finchley.M9</spring-cloud.version>
    </properties>

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

    <repositories>
        <repository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/milestone</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </repository>
    </repositories>
</project>

3.添加注解

4.配置yml文件

文件配置如下

---
eureka:
  client:
    service-url:
      defaultZone: http://127.0.0.1:8761/eureka
    register-with-eureka: false
spring:
  application:
    name: cloudspace-service-center
server:
  port: 8761

5.验证

输入地址:http://127.0.0.1:8761/ 如果页面打开如下证明配置成功