开发环境

开发工具：IDEA 2021.3.2

JDK版本：JDK1.8

Maven版本：Maven3.8

Zookeeper版本：zookeeper-3.5.10

SpringCloud版本：Hoxton.SR12

SpringBoot版本：2.3.12.RELEASE

创建Zookeeper注册中心

点击链接下载Zookeeper

https://downloads.apache.org/zookeeper/zookeeper-3.5.10/apache-zookeeper-3.5.10-bin.tar.gz

解压缩apache-zookeeper-3.5.10-bin.tar.gz

进入conf目录，复制zoo_sample.cfg并重命名为zoo.cfg

 进入bin目录下，点击zkServer.cmd启动zk服务

 点击zkCli.cmd进入zk客户端查看内容

创建父工程 

创建Maven工程，命名为spring-cloud-2022-zk

删除src目录

配置依赖

①导入Spring Cloud依赖

<dependencyManagement>
        <dependencies>
            <!--SpringCloud 依赖-->
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Hoxton.SR12</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

②导入Spring Boot依赖

            <!--SpringBoot 依赖-->
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>2.3.12.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>

创建服务提供者

在父工程里面创建maven模块，命名为cloud-provider8001

①导入依赖

    <dependencies>
        <!--springboot依赖-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <!--zookeeper 依赖-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-zookeeper-discovery</artifactId>
        </dependency>
    </dependencies>

②创建application.yml配置文件

server:
  port: 8001

spring:
  application:
    name: cloud-provider
  cloud:
    zookeeper:
      connect-string: localhost:2181    #zookeeper地址端口号

③创建启动类，添加@EnableDiscoveryClient注解

@EnableDiscoveryClient
@SpringBootApplication
public class Provider8001 {
    public static void main(String[] args) {
        SpringApplication.run(Provider8001.class, args);
    }
}

④创建controller

@RestController
@RequestMapping("provider")
public class ProviderController {

    @GetMapping("getUUID")
    public String getUUID() {
        return UUID.randomUUID().toString();
    }
}

测试

①依次启动zkServer.cmd，zkCli.cmd，cloud-provider8001

②zkCli查看已启动的服务

 ③访问http://localhost:8001/provider/getUUID

创建服务消费者

在父工程里面创建maven模块，命名为cloud-consumer80

①导入依赖

    <dependencies>
        <!--springboot依赖-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <!--zookeeper 依赖-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-zookeeper-discovery</artifactId>
        </dependency>
    </dependencies>

②创建application.yml配置文件

server:
  port: 80

spring:
  application:
    name: cloud-consumer
  cloud:
    zookeeper:
      connect-string: localhost:2181

③创建启动了，添加@EnableDiscoveryClient注解

@EnableDiscoveryClient
@SpringBootApplication
public class Consumer80 {
    public static void main(String[] args) {
        SpringApplication.run(Consumer80.class, args);
    }
}

④创建ApplicationContextConfig类

@Configuration
public class ApplicationContextConfig {
    @Bean
    @LoadBalanced
    public RestTemplate getRestTemplate() {
        //RestTemplate注入到spring容器中
        return new RestTemplate();
    }
}

⑤创建controller，实现远程调用

@RestController
@RequestMapping("consumer")
public class ConsumerController {
    // 服务提供者的名字（spring.application.name）
    private static final String URL = "http://cloud-provider";
    @Autowired
    private RestTemplate restTemplate;

    @GetMapping("getUUID")
    public String getUUID() {
        return restTemplate.getForObject(URL + "/provider/getUUID", String.class);
    }
}

测试

①依次启动zkServer.cmd，zkCli.cmd，cloud-provider8001，cloud-consumer80

②zkCli查看已启动的服务

 ③访问 http://localhost/consumer/getUUID 进行远程调用