Spring Cloud使用ZooKeeper作为注册中心的示例

简单的Spring Cloud应用程序使用ZooKeeper作为注册中心的示例：
1.新建模块：

2.勾选依赖：

3.在pom.xml文件中做出部分修改及添加Spring Cloud Zookeeper 依赖版本：

完整pom文件

java 复制代码

<?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 https://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>3.2.2</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <!-- Generated by https://start.springboot.io -->
    <!-- 优质的 spring/boot/data/security/cloud 框架中文文档尽在 => https://springdoc.cn -->
    <groupId>com.example</groupId>
    <artifactId>ZooKeeper</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>ZooKeeper</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>1.8</java.version>
        <zookeeper.version>2.2.5.RELEASE</zookeeper.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-webflux</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-zookeeper-config</artifactId>
            <version>${zookeeper.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-zookeeper-discovery</artifactId>
            <version>${zookeeper.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>io.projectreactor</groupId>
            <artifactId>reactor-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>
    <dependencyManagement>
        <dependencies>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

4.配置ZooKeeper连接：在application.yml文件中配置ZooKeeper的连接字符串。

java 复制代码

spring:
  application:
    name: product
  cloud:
    zookeeper:
      connect-string: localhost:2181
server:
  port: 8101

5.新增Controller:

java 复制代码

package com.example.zookeeperserver;

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping
public class ProductController {
    @GetMapping("product")
    public String product(){
        return "this is product";
    }
}

java 复制代码

package com.example.zookeeper;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

@RestController
public class ServiceController {
    @Autowired
    private DiscoveryClient discoveryClient;

    /**
     * @Description:通过注入DiscoveryClient实例来获取服务实例的信息
     * @Author: 
     * @Date: 2024/2/7 15:46
     * @return: java.util.List<java.lang.String>
     *     访问地址：http://localhost:8101/services
     **/
    @GetMapping("/services")
    public List<String> getServices(){
        //返回所有注册到服务发现中心的服务名称
        return discoveryClient.getServices();
    }

    /**
     * @Description:
     * @Author: 
     * @Date: 2024/2/7 15:52
     * @param serviceName:
     * @return: java.util.List<org.springframework.cloud.client.ServiceInstance>
     *     访问地址：http://localhost:8101/serviceInstances/product
     **/
    @GetMapping("/serviceInstances/{serviceName}")
    public List<ServiceInstance> getServiceInstance(@PathVariable String serviceName){
        //getServiceInstances方法接受一个服务名称作为参数，返回该服务的所有实例。
        //每个ServiceInstance对象包含了服务实例的详细信息，如主机名、端口号等
        return discoveryClient.getInstances(serviceName);
    }

}

6.启动本地的服务端：

7.启动服务注册和发现：在主应用类中，通过@EnableDiscoveryClient注解启用服务注册和发现

8.访问：localhost:8101/product

完整项目代码