SpringCloud之注册中心

1.SpringCloud电商示例

1.1.示例架构

以常见的电商业务为例

cloud-demo:
	- order-service  # 订单服务
    - user-service   # 用户服务
    - product-service # 商品服务
    — cloud-common # 不是应用服务,主要用于存放一些公共的内容，如pojo、baseservice这种、还有utils

cloud-demo模块pom.xml：


<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>4.0.0modelVersion>
    <groupId>com.acxgroupId>
    <artifactId>cloud-demoartifactId>
    <packaging>pompackaging>
    <version>1.0.0version>
    <modules>
        <module>cloud-commonmodule>
        <module>order-servicemodule>
        <module>product-servicemodule>
        <module>user-servicemodule>
    modules>

    <parent>
        <groupId>org.springframework.bootgroupId>
        <artifactId>spring-boot-starter-parentartifactId>
        <version>2.1.4.RELEASEversion>
    parent>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloudgroupId>
                <artifactId>spring-cloud-dependenciesartifactId>
                <version>Greenwich.SR1version>
                <type>pomtype>
                <scope>importscope>
            dependency>
        dependencies>
    dependencyManagement>

    <dependencies>
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-testartifactId>
        dependency>
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-webartifactId>
        dependency>
    dependencies>
project>

cloud-common模块pom.xml:


<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>cloud-demoartifactId>
        <groupId>com.acxgroupId>
        <version>1.0.0version>
    parent>
    <modelVersion>4.0.0modelVersion>

    <groupId>com.acxgroupId>
    <artifactId>cloud-commonartifactId>
    <version>1.0.0version>
    <packaging>jarpackaging>

    <properties>
        <lombok.version>1.18.20lombok.version>
        <druid.version>1.1.10druid.version>
        <mybatis.plus.version>3.2.0mybatis.plus.version>
        <redis.version>1.4.1.RELEASEredis.version>
        <fastjson.version>1.2.15fastjson.version>
    properties>

    <dependencies>
        
        <dependency>
            <groupId>org.projectlombokgroupId>
            <artifactId>lombokartifactId>
            <version>${lombok.version}version>
        dependency>
        
        <dependency>
            <groupId>com.alibabagroupId>
            <artifactId>fastjsonartifactId>
            <version>${fastjson.version}version>
        dependency>
        
        <dependency>
            <groupId>com.baomidougroupId>
            <artifactId>mybatis-plus-boot-starterartifactId>
            <version>${mybatis.plus.version}version>
        dependency>
        
        <dependency>
            <groupId>mysqlgroupId>
            <artifactId>mysql-connector-javaartifactId>
            <scope>runtimescope>
        dependency>
        
        <dependency>
            <groupId>com.alibabagroupId>
            <artifactId>druid-spring-boot-starterartifactId>
            <version>${druid.version}version>
        dependency>
        
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-redisartifactId>
            <version>${redis.version}version>
        dependency>
    dependencies>
project>

user-service模块pom.xml:


<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>cloud-demoartifactId>
        <groupId>com.acxgroupId>
        <version>1.0.0version>
    parent>
    <modelVersion>4.0.0modelVersion>

    <groupId>com.acxgroupId>
    <artifactId>user-serviceartifactId>
    <version>1.0.0version>
    <packaging>jarpackaging>

    <dependencies>
        <dependency>
            <groupId>com.acxgroupId>
            <artifactId>cloud-commonartifactId>
            <version>1.0.0version>
        dependency>
    dependencies>
project>

user-service配置文件application.yml：

server:
  port: 8083
spring:
  application:
    name: user-service
  datasource:
    driver-class-name: com.mysql.jdbc.Driver
    username: root
    password: 123456
    url: jdbc:mysql://localhost:3306/mc_mall?useSSL=false&useUnicode=true&characterEncoding=utf-8
    type: com.alibaba.druid.pool.DruidDataSource
    initialSize: 50   #初始化时建立物理连接的个数
    minIdle: 30    #最小连接池数量
    maxActive: 200  #最大连接池数量
    maxWait: 60000    #获取连接时最大等待时间
    timeBetweenEvictionRunsMillis: 60000    #Destory线程检测连接的间隔时间
    minEvictableIdleTimeMillis: 300000    #连接保持空闲而不被驱逐的最长时间
  redis:
    host: localhost
    port: 6379
    password: 123456

product-service模块pom.xml:


<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>cloud-demoartifactId>
        <groupId>com.acxgroupId>
        <version>1.0.0version>
    parent>
    <modelVersion>4.0.0modelVersion>

    <groupId>com.acxgroupId>
    <artifactId>product-serviceartifactId>
    <version>1.0.0version>
    <packaging>jarpackaging>

    <dependencies>
        <dependency>
            <groupId>com.acxgroupId>
            <artifactId>cloud-commonartifactId>
            <version>1.0.0version>
        dependency>
    dependencies>
project>

product-service配置文件application.yml：

server:
  port: 8082
spring:
  application:
    name: product-service
  datasource:
    driver-class-name: com.mysql.jdbc.Driver
    username: root
    password: 123456
    url: jdbc:mysql://localhost:3306/mc_mall?useSSL=false&useUnicode=true&characterEncoding=utf-8
    type: com.alibaba.druid.pool.DruidDataSource
    initialSize: 50   #初始化时建立物理连接的个数
    minIdle: 30    #最小连接池数量
    maxActive: 200  #最大连接池数量
    maxWait: 60000    #获取连接时最大等待时间
    timeBetweenEvictionRunsMillis: 60000    #Destory线程检测连接的间隔时间
    minEvictableIdleTimeMillis: 300000    #连接保持空闲而不被驱逐的最长时间
  redis:
    host: localhost
    port: 6379
    password: 123456

order-service模块pom.xml:


<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>cloud-demoartifactId>
        <groupId>com.acxgroupId>
        <version>1.0.0version>
    parent>
    <modelVersion>4.0.0modelVersion>

    <groupId>com.acxgroupId>
    <artifactId>order-serviceartifactId>
    <version>1.0.0version>
    <packaging>jarpackaging>

    <dependencies>
        <dependency>
            <groupId>com.acxgroupId>
            <artifactId>cloud-commonartifactId>
            <version>1.0.0version>
        dependency>
    dependencies>
project>

order-service配置文件application.yml：

server:
  port: 8081
spring:
  application:
    name: order-service
  datasource:
    driver-class-name: com.mysql.jdbc.Driver
    username: root
    password: 123456
    url: jdbc:mysql://localhost:3306/mc_mall?useSSL=false&useUnicode=true&characterEncoding=utf-8
    type: com.alibaba.druid.pool.DruidDataSource
    initialSize: 50   #初始化时建立物理连接的个数
    minIdle: 30    #最小连接池数量
    maxActive: 200  #最大连接池数量
    maxWait: 60000    #获取连接时最大等待时间
    timeBetweenEvictionRunsMillis: 60000    #Destory线程检测连接的间隔时间
    minEvictableIdleTimeMillis: 300000    #连接保持空闲而不被驱逐的最长时间
  redis:
    host: localhost
    port: 6379
    password: 123456

1.2.Spring Cloud与Spring Boot

关系：Spring Boot是Spring Cloud中必不可少的一部分，Springboot是微服务的基础实现技术。

Spring Boot和Spring Cloud版本对应表：也可自行去官网查看

Release Train	Boot Version
2021.0.x aka Jubilee	2.6.x
2020.0.x aka Ilford	2.4.x, 2.5.x (Starting with 2020.0.3)
Hoxton	2.2.x, 2.3.x (Starting with SR5)
Greenwich	2.1.x
Finchley	2.0.x
Edgware	1.5.x
Dalston	1.5.x

2.Eureka注册中心

2.1.Eureka Server

Eureka2.X版本已经停止更新维护了，但是Eureka1.X版本还是一直在进行更新维护的

步骤一：新建eureka-service服务，并引入Eureka Server的pom依赖


<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>cloud-demoartifactId>
        <groupId>com.acxgroupId>
        <version>1.0.0version>
    parent>
    <modelVersion>4.0.0modelVersion>

    <groupId>com.acxgroupId>
    <artifactId>eureka-serviceartifactId>
    <version>1.0.0version>
    <packaging>jarpackaging>

    <dependencies>
        <dependency>
            <groupId>org.springframework.cloudgroupId>
            <artifactId>spring-cloud-starter-netflix-eureka-serverartifactId>
        dependency>
    dependencies>
project>

步骤二：eureka-service服务启动类上面加上@EnableEurekaServer标签开启eureka-server服务

package com.acx;

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);
    }

}

步骤三：编写eureka配置application.yml

server:
  port: 10081
spring:
  application:
    name: eureka-service
eureka:
  client:
    service-url:
      defaultZone: http://127.0.0.1:10081/eureka/
    register-with-eureka: false #是否在注册中心注册自己
    fetch-registry: false #是否检索拉取服务列表

2.2.Eureka Client

步骤一：以order-service服务为例pom文件引入eureka-client依赖，后面依次配置product和user服务即可

<dependency>
    <groupId>org.springframework.cloudgroupId>
    <artifactId>spring-cloud-starter-netflix-eureka-clientartifactId>
dependency>

步骤二：编写eureka相关的配置文件

eureka:
  client:
    fetch-registry: true
    register-with-eureka: true
    service-url:
      defaultZone: http://127.0.0.1:10081/eureka/

Eureka控制台查看服务注册详情

游览器输入localhost:100081直接访问euraka控制台，发现order、product、user三个服务注册成功

在这里插入图片描述

2.3.Eureka保活机制

每一个eureka-client客户端服务都会定时的想eureka-server注册中心发送一个心跳包进行保活，服务端会通过心跳包来实现对客户端活跃状态进行监控。

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原文地址：https://blog.csdn.net/weixin_43054590/article/details/127097909