springcloud-註冊中心快速構建

1. 場景描述

springcloud提供了一整套可行的構建分佈式系統的方案，使的企業/開發人員可以快速溝通分佈式系統，今天快速構建下springcloud的註冊中心Eureka。

2. 解決方案

2.1 springcloud介紹

COORDINATE ANYTHING: DISTRIBUTED SYSTEMS SIMPLIFIED

Building distributed systems doesn't need to be complex and error-prone. Spring Cloud offers a simple and accessible programming model to the most common distributed system patterns, helping developers build resilient, reliable, and coordinated applications. Spring Cloud is built on top of Spring Boot, making it easy for developers to get started and become productive quickly.

2.2 項目構建

使用的idea終極版，springcloud項目自己就是springboot項目（springboot與springcloud的關係）。

首先在idea中建立項目：file-->new-->project

兩個默認next後選擇組件

默認next->finish

2.3 配置文件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>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.4.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.spc</groupId>
    <artifactId>eurekaserver</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>eurekaserver</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
        <spring-cloud.version>Greenwich.SR1</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>

</project>

說明：

（1）springcloud自己是springboot項目，新建springboot項目。

（2）須要兩個starter，eureka-server和eureka-client

2.4 application啓動類

package com.spc.eurekaserver;

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

@SpringBootApplication
@EnableEurekaServer
public class EurekaserverApplication {

    public static void main(String[] args) {
        SpringApplication.run(EurekaserverApplication.class, args);
    }

}

說明：

比springboot項目多了一個標籤：@EnableEurekaServer，該標籤用於標註是註冊中心。

2.5 application.yml文件

spring:
  application:
    name: registry

server:
  port: 8761
eureka:
  client:
    register-with-eureka: false
    service-url:
      defaultZone: http://localhost:8761/eureka/

說明：

（1）name爲項目名稱；

（2）port: 8761爲啓動端口。

（3）eureka下面的配置暫時不用，後續用於在高可用配置的時候，做爲客戶端註冊到另外一臺註冊中心，實現高可用。

2.6 啓動應用

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原文出處：https://www.cnblogs.com/ruanjianlaowang/p/11204981.html