springcloud组件Eureka

你的名字 2022-05-13 07:22 279阅读 0赞

# 1.什么是eureka #

Eureka是Netflix开发的服务发现组件，本身是一个基于REST的服务。Spring Cloud将它集成在其子项目spring-cloud-netflix中，以实现Spring Cloud的服务发现功能。

# 2.在哪可以找到 #

*  [源码地址][Link 1]
 *  [文档地址][Link 2]
 *  [架构介绍][Link 3]

# 3.如何使用 #

电商案例模拟：客户端-->订单微服务-->用户微服务

## 3.1 创建父工程\[springcloud-study\] ##

### 3.1.1 代码结构 ###

![70][]

### 3.1.2 引入springcloud版本依赖 ###

说明：参考 [springcloud-快速启动][springcloud-]

<?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.iot</groupId>
        <artifactId>springcloud-study</artifactId>
        <version>1.0-SNAPSHOT</version>
        <parent>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>1.5.13.RELEASE</version>
        </parent>
        <properties>
            <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
            <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
            <maven.compiler.source>1.8</maven.compiler.source>
            <maven.compiler.target>1.8</maven.compiler.target>
        </properties>
        <dependencyManagement>
            
            <dependencies>
                <dependency>
                    <groupId>org.springframework.cloud</groupId>
                    <artifactId>spring-cloud-dependencies</artifactId>
                    <version>Dalston.SR5</version>
                    <type>pom</type>
                    <scope>import</scope>
                </dependency>
            </dependencies>
        </dependencyManagement>
    </project>

## 3.2 在父工程上创建\[eureka-server\] ##

![70 1][]

### 3.2.1 删除父工程src目录 ###

目录结构

![70 2][]

### 3.2.2 加入eureka服务端依赖 ###

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">
        <parent>
            <artifactId>springcloud-study</artifactId>
            <groupId>com.iot</groupId>
            <version>1.0-SNAPSHOT</version>
        </parent>
        <modelVersion>4.0.0</modelVersion>
        <packaging>jar</packaging>
        <artifactId>eureka-server</artifactId>
        <dependencies>
            
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-eureka-server</artifactId>
            </dependency>
        </dependencies>
        <build>
            <plugins>
                
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                </plugin>
            </plugins>
        </build>
    </project>

### 3.2.3 创建Eureka 服务启动类 ###

package com.myx;
    
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.boot.builder.SpringApplicationBuilder;
    import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;
    
    /**
     * 描述: Eureka 服务启动类
     * @author: myx
     * @date: 2018/9/11
     * Copyright © 2018-hotpot. All rights reserved.
     */
    @SpringBootApplication
    @EnableEurekaServer
    public class EurekaApplication {
        public static void main(String[] args) {
            new SpringApplicationBuilder(EurekaApplication.class).run(args);
        }
    }

### 3.2.4 创建application.yml文件 ###

server:
      port: 8761
    #spring
    spring:
      application:
        name: eureka-server
    
    eureka:
      client:
        #取消向eureka server(注册中心)注册
        register-with-eureka: false
        #取消向eureka server(注册中心)获取注册信息
        fetch-registry: false
        service-url:
          #eureka 提供服务发现的地址
          defaultZone: http://localhost:8761/eureka

### 3.2.5 运行EurekaApplication ###

访问 [http://localhost:8761/][http_localhost_8761]

![70 3][]

[Link 1]: https://github.com/Netflix/eureka/
[Link 2]: https://github.com/Netflix/eureka/wiki
[Link 3]: https://github.com/Netflix/eureka/wiki/Eureka-at-a-glance
[70]: /images/20220513/73fb80ae0cc54777af9fb681f6a9420c.png
[springcloud-]: http://projects.spring.io/spring-cloud/#quick-start
[70 1]: /images/20220513/932b8a51959e4ce58c6c649e3593dced.png
[70 2]: /images/20220513/27fc2b4bd9d34f8e8d9596e0157892f3.png
[http_localhost_8761]: http://localhost:8761/
[70 3]: /images/20220513/fd2e801a286a48b3824ef69106dc399c.png