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注册中心在前文提到有很多选型，在这里以Spring Cloud Zookeeper为例说明注册中心的集成和使用。

选择Spring Cloud Zookeeper作为注册中心原因如下：

• 依赖更少，只依赖zookeeper单体或集群的部署。
• 配置更通用，Eureka和zookeeper的切换只需要少量配置切换即可完成。
• 集成方便，注解通用，集成starter即可。

客户端引入

• 修改子工程的pom.xml，引入Spring Cloud Zookeeper。

    
        io.rainforest
        banana
        1.0
    
    4.0.0

    banana-client1
    spring cloud banana-client1
    jar


    
        
            org.springframework.boot
            spring-boot-starter-web
        
        
            org.springframework.boot
            spring-boot-starter-undertow
        
        
        
            org.springframework.cloud
            spring-cloud-starter-zookeeper-discovery
        
        
            org.springframework.cloud
            spring-cloud-starter-openfeign
        
        
        
            org.springframework.cloud
            spring-cloud-openfeign-core
            true
        
        
        
            io.rainforest
            banana-common-core
        
        
            cn.hutool
            hutool-crypto
        
        
            cn.hutool
            hutool-http
        
        
            com.github.xiaoymin
            knife4j-openapi3-jakarta-spring-boot-starter
        
    

    
        
            
                org.springframework.boot
                spring-boot-maven-plugin
            
        
    

启动zookeeper

• 前置条件，zookeeper依赖JVM，所以运行前得配置java环境变量。新建 JAVA_HOME 环境变量。
• 下载zookeeper安装包，linux和windows的版本是同一个。 官方网站是： https://zookeeper.apache.org/releases.html
• 目录格式如下

|-- LICENSE.txt
|-- NOTICE.txt
|-- README.md
|-- README_packaging.md
|-- bin
|-- conf
|-- data
|-- docs
|-- lib

• 修改配置文件，此处为单体非集群版配置，在conf/zoo.cfg。

# The number of milliseconds of each tick
tickTime=2000
# The number of ticks that the initial 
# synchronization phase can take
initLimit=10
# The number of ticks that can pass between 
# sending a request and getting an acknowledgement
syncLimit=5
# the directory where the snapshot is stored.
# do not use /tmp for storage, /tmp here is just 
# example sakes.
dataDir=E:/DevTool/apache-zookeeper-3.8.2-bin/data
# the port at which the clients will connect
clientPort=2181

• 启动zookeeper。

# windows系统
binzkServer.cmd
# Linux系统
binzkServer.sh

启动应用

• 在启动类上增加注解，进行服务发布。

package io.rainforest.banana.client1;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.openfeign.EnableFeignClients;

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

• 修改应用配置。

spring.application.name: client1
spring:
  cloud:
    zookeeper:
      connect-string: localhost:2181 ## 注册中心的配置
server:
  port: 10101
  servlet:
    context-path: /client1

• 启动应用之前先启动zookeeper。

查看注册数据

get /services/client1/b257e7f5-a451-4119-ba20-e7622f3aeaba

{"name":"client1","id":"b257e7f5-a451-4119-ba20-e7622f3aeaba","address":"cat","port":10101,"sslPort":null,"payload":{"@class":"org.springframework.cloud.zookeeper.discovery.ZookeeperInstance","id":"client1","name":"client1","metadata":{"instance_status":"UP"}},"registrationTimeUTC":1698715221404,"serviceType":"DYNAMIC","uriSpec":{"parts":[{"value":"scheme","variable":true},{"value":"://","variable":false},{"value":"address","variable":true},{"value":":","variable":false},{"value":"port","variable":true}]}}

默认的zookeeper注册中心的数据放在 /services/客户端名称/实例名称 。

源码信息

和“SpringCloud实战”对应的源码信息如下：

• github https://github.com/r0ad/spring-cloud-example
• gitee https://gitee.com/r0ad/spring-cloud-example

关于作者

来自一线全栈程序员nine的八年探索与实践，持续迭代中。欢迎关注公众号“雨林寻北”或添加个人卫星codetrend（备注技术）。