zookeeper实现微服务注册

zookeeper实现微服务注册

创建父工程

创建父工程，用于版本管理，修改pom文件：设置打包类型为pom、设置依赖管理（src文件可以删除）

<packaging>pom</packaging>

<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>1.8</maven.compiler.source>
    <maven.compiler.target>1.8</maven.compiler.target>
    <junit.version>4.12</junit.version>
    <log4j.version>1.2.17</log4j.version>
    <lombok.version>1.16.18</lombok.version>
    <mysql.version>5.1.47</mysql.version>
    <druid.version>1.1.16</druid.version>
    <mybatis.spring.boot.version>1.3.0</mybatis.spring.boot.version>
  </properties>

  <!-- 子模块继承之后，提供作用:锁定版本+子modlue不用写groupId和version  -->
  <dependencyManagement>
    <dependencies>
      <!--spring boot 2.2.2-->
      <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-dependencies</artifactId>
        <version>2.2.2.RELEASE</version>
        <type>pom</type>
        <scope>import</scope>
      </dependency>
      <!--spring cloud Hoxton.SR1-->
      <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-dependencies</artifactId>
        <version>Hoxton.SR1</version>
        <type>pom</type>
        <scope>import</scope>
      </dependency>
      <!--spring cloud alibaba 2.1.0.RELEASE-->
      <dependency>
        <groupId>com.alibaba.cloud</groupId>
        <artifactId>spring-cloud-alibaba-dependencies</artifactId>
        <version>2.1.0.RELEASE</version>
        <type>pom</type>
        <scope>import</scope>
      </dependency>
      <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>${mysql.version}</version>
      </dependency>
      <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>druid</artifactId>
        <version>${druid.version}</version>
      </dependency>
      <dependency>
        <groupId>org.mybatis.spring.boot</groupId>
        <artifactId>mybatis-spring-boot-starter</artifactId>
        <version>${mybatis.spring.boot.version}</version>
      </dependency>
      <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>${junit.version}</version>
      </dependency>
      <dependency>
        <groupId>log4j</groupId>
        <artifactId>log4j</artifactId>
        <version>${log4j.version}</version>
      </dependency>
      <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <version>${lombok.version}</version>
        <optional>true</optional>
      </dependency>
    </dependencies>
  </dependencyManagement>

  <build>
    <plugins>
      <plugin>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-maven-plugin</artifactId>
        <version>2.3.4.RELEASE</version>
        <configuration>
          <fork>true</fork>
          <addResources>true</addResources>
        </configuration>
      </plugin>
    </plugins>
  </build>

创建子项目

创建子项目依赖父工程，导入依赖

注意，这里有个坑：spring-cloud-starter-zookeeper-discovery依赖中自带了zookeeper依赖，如果该依赖版本和服务器安装的zookeeper版本不一致就会产生冲突

解决方法：在spring-cloud-starter-zookeeper-discovery中排除自带的zookeeper版本，然后再导入和服务器版本一致的zookeeper依赖，我的服务器安装的是3.5.7版本的zookeeper，所以导入的zookeeper依赖版本也是3.5.7

<dependencies>
    <!-- SpringBoot整合Web组件 -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <!-- SpringBoot整合zookeeper客户端 -->
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-zookeeper-discovery</artifactId>
        <version>2.2.1.RELEASE</version>
        <!--先排除自带的zookeeper版本-->
        <exclusions>
            <exclusion>
                <groupId>org.apache.zookeeper</groupId>
                <artifactId>zookeeper</artifactId>
            </exclusion>
        </exclusions>
    </dependency>
    <!--添加zookeeper版本(保持和服务器zookeeper版本一致)-->
    <dependency>
        <groupId>org.apache.zookeeper</groupId>
        <artifactId>zookeeper</artifactId>
        <version>3.5.7</version>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-devtools</artifactId>
        <scope>runtime</scope>
        <optional>true</optional>
    </dependency>
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <optional>true</optional>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
</dependencies>

修改配置文件

server:
  port: 8003

spring:
  application:
    name: payment
  cloud:
    zookeeper:
      # zookeeper服务URL
      connect-string: 192.168.84.136:2181

主启动类添加@EnableDiscoveryClient注解

package com.yl.payment;

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

@SpringBootApplication
@EnableDiscoveryClient
public class Payment8003Application {

    public static void main(String[] args) {
        SpringApplication.run(Payment8003Application.class,args);
    }

}

项目配置完成，启动zookeeper（关闭服务器防火墙，使得本机能够ping通服务器），然后再启动项目

进入zookeeper客户端，查看节点，可以看到除了根节点还有一个services节点

[zk: localhost:2181(CONNECTED) 0] ls /
[services, zookeeper]

查看services节点，可以看到服务成功注册到zookeeper

[zk: localhost:2181(CONNECTED) 1] ls /services
[payment]

服务节点之下还有一个节点，该节点保存了服务相关信息，通过get命令可以查看该信息

[zk: localhost:2181(CONNECTED) 2] ls /services/payment
[06af6b61-9271-49d9-9274-71b36cd0925e]
[zk: localhost:2181(CONNECTED) 3] ls /services/payment/06af6b61-9271-49d9-9274-71b36cd0925e
[]
[zk: localhost:2181(CONNECTED) 4] get /services/payment/06af6b61-9271-49d9-9274-71b36cd0925e
{"name":"payment","id":"06af6b61-9271-49d9-9274-71b36cd0925e","address":"DESKTOP-GBI6726.mshome.net","port":8003,"sslPort":null,"payload":{"@class":"org.springframework.cloud.zookeeper.discovery.ZookeeperInstance","id":"application-1","name":"payment","metadata":{}},"registrationTimeUTC":1647145928099,"serviceType":"DYNAMIC","uriSpec":{"parts":[{"value":"scheme","variable":true},{"value":"://","variable":false},{"value":"address","variable":true},{"value":":","variable":false},{"value":"port","variable":true}]}}