SpringCloud：注册中心——Zookeeper

男娘i 2022-03-26 06:10 283阅读 0赞

一，SpringCloud注册中心

1，SpringCloud支持三种方式的注册中心：Eureka，Zookeeper，Consul；本篇对Zookeeper中心进行分析

2，SpringCloud集成Zookeeper实现注册中心，依然保持Zookeeper最基本的服务注册和服务发现方式，获取服务路径后最终实现服务调用。如下图，通过Zookeeper实现注册中心同样分为三个部分。

![20190115223524880.png][]

二，代码实现

1，项目结构

![20190115223924273.png][]

\* 通过两台服务端演示负载均衡

2，Zookeeper服务器

\* 此处采用之前搭建好的Zookeeper服务集群，在Linux系统上通过三台虚拟机实现，参考博文：                              [https://blog.csdn.net/u011976388/article/details/81259886][https_blog.csdn.net_u011976388_article_details_81259886]

3，服务生产者

a，Maven依赖

<parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.1.RELEASE</version>
      </parent>
      
      <dependencyManagement>
        <dependencies>
          <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-dependencies</artifactId>
            <version>Finchley.M7</version>
            <type>pom</type>
            <scope>import</scope>
          </dependency>
        </dependencies>
      </dependencyManagement>
      <dependencies>
        
        <dependency>
          <groupId>org.springframework.boot</groupId>
          <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        
        <dependency>
          <groupId>org.springframework.cloud</groupId>
          <artifactId>spring-cloud-starter-zookeeper-discovery</artifactId>
        </dependency>
      </dependencies>
      
      <repositories>
        <repository>
          <id>spring-milestones</id>
          <name>Spring Milestones</name>
          <url>https://repo.spring.io/libs-milestone</url>
          <snapshots>
            <enabled>false</enabled>
          </snapshots>
        </repository>
      </repositories>

b，Server\_1配置信息

###订单服务的端口号
    server:
      port: 8002
    ###服务别名----服务注册到注册中心名称
    spring:
      application:
        name: zk-member
      cloud:
        zookeeper:
          ### Zookeeper注册中心集群
          connect-string: 192.168.91.128:2181,192.168.91.129:2181,192.168.91.130:2181

c，Server\_2配置信息

###订单服务的端口号
    server:
      port: 8001
    ###服务别名----服务注册到注册中心名称
    spring:
      application:
        name: zk-member
      cloud:
        zookeeper:
          ### Zookeeper注册中心集群
          connect-string: 192.168.91.128:2181,192.168.91.129:2181,192.168.91.130:2181

d，服务接口

package com.gupao.zookeeper.controller;
    
    import org.springframework.beans.factory.annotation.Value;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    /**
     * @author pj_zhang
     * @create 2019-01-15 22:08
     **/
    @RestController
    public class MemberController {
    
        @Value("${server.port}")
        private Integer port;
    
        @RequestMapping("/getMember")
        public String getMember() {
            return "MemberController.getMember, port : " + port;
        }
    
    }

e， 启动Main函数

package com.gupao;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
    
    /**
     * @author pj_zhang
     * @create 2019-01-15 22:16
     **/
    @SpringBootApplication
    // 通过Zookeeper注册中心注册/发现服务
    @EnableDiscoveryClient
    public class ZookeeperServerApp {
    
        public static void main(String[] args) {
            SpringApplication.run(ZookeeperServerApp.class, args);
        }
    
    }

f，启动效果，在Zookeeper节点上进行查看。发现生成了zk-member的父节点，并再下面生成了两个服务节点，其中之一具体节点信息如下JSON展示。表名服务端两台服务器已经全部注册到Zookeeper注册中心

![20190115224247154.png][]

{
    	"name": "zk-member",
    	"id": "ceb7f446-1214-42bc-a742-576feb108f39",
    	"address": "USER-20180510PQ",
    	"port": 8002,
    	"sslPort": null,
    	"payload": {
    		"@class": "org.springframework.cloud.zookeeper.discovery.ZookeeperInstance",
    		"id": "application-1",
    		"name": "zk-member",
    		"metadata": {}
    	},
    	"registrationTimeUTC": 1547561383883,
    	"serviceType": "DYNAMIC",
    	"uriSpec": {
    		"parts": [{
    			"value": "scheme",
    			"variable": true
    		}, {
    			"value": "://",
    			"variable": false
    		}, {
    			"value": "address",
    			"variable": true
    		}, {
    			"value": ":",
    			"variable": false
    		}, {
    			"value": "port",
    			"variable": true
    		}]
    	}
    }

4，服务消费者

a，Maven依赖

<parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.1.RELEASE</version>
      </parent>
      
      <dependencyManagement>
        <dependencies>
          <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-dependencies</artifactId>
            <version>Finchley.M7</version>
            <type>pom</type>
            <scope>import</scope>
          </dependency>
        </dependencies>
      </dependencyManagement>
      <dependencies>
        
        <dependency>
          <groupId>org.springframework.boot</groupId>
          <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        
        <dependency>
          <groupId>org.springframework.cloud</groupId>
          <artifactId>spring-cloud-starter-zookeeper-discovery</artifactId>
        </dependency>
        
        <dependency>
          <groupId>org.springframework.cloud</groupId>
          <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>
      </dependencies>
      
      <repositories>
        <repository>
          <id>spring-milestones</id>
          <name>Spring Milestones</name>
          <url>https://repo.spring.io/libs-milestone</url>
          <snapshots>
            <enabled>false</enabled>
          </snapshots>
        </repository>
      </repositories>

b，配置信息

###订单服务的端口号
    server:
      port: 8003
    ###服务别名----服务注册到注册中心名称
    spring:
      application:
        name: zk-order
      cloud:
        zookeeper:
          ### Zookeeper注册中心集群
          connect-string: 192.168.91.128:2181,192.168.91.129:2181,192.168.91.130:2181

c，RestTemplate方式调用

\* 调用接口

package com.gupao.zookeeper.controller;
    
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RestController;
    import org.springframework.web.client.RestTemplate;
    
    /**
     * @author pj_zhang
     * @create 2019-01-15 22:01
     **/
    @RestController
    public class OrderController {
    
        @Autowired
        private RestTemplate restTemplate;
    
        @RequestMapping("/orderToMember")
        public String orderToMember() {
            return restTemplate.getForObject("http://zk-member/getMember", String.class);
        }
    
    }

\* 启动Main函数

package com.gupao;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
    import org.springframework.cloud.client.loadbalancer.LoadBalanced;
    import org.springframework.cloud.openfeign.EnableFeignClients;
    import org.springframework.context.annotation.Bean;
    import org.springframework.web.client.RestTemplate;
    
    /**
     * @author pj_zhang
     * @create 2019-01-15 21:56
     **/
    @SpringBootApplication
    // Zookeeper注册中心进行服务注册和发现
    @EnableDiscoveryClient
    public class ZookeeperClientApp {
    
        public static void main(String[] args) {
            SpringApplication.run(ZookeeperClientApp.class, args);
        }
    
        // 服务端通过application_name进行服务发现, 默认为多服务处理
        // 此处通过@LoadBalanced实现负载均衡
        @Bean
        @LoadBalanced
        public RestTemplate restTemplate() {
            return new RestTemplate();
        }
    
    }

\* 效果演示

![2019011522493272.png][]

![20190115224938873.png][]

d，声明式Feign方式调用

\* 项目结构

![20190115225122404.png][]

\* Feign接口

package com.gupao.zookeeper.feign;
    
    import org.springframework.cloud.openfeign.FeignClient;
    import org.springframework.web.bind.annotation.RequestMapping;
    
    /**
     * @author pj_zhang
     * @create 2019-01-15 22:23
     **/
    // 服务名称, 通过服务名称到注册中心发现服务
    @FeignClient(name = "zk-member/")
    public interface IMemberFeign {
    
        // 服务接口, 通过上一步发现的服务及所调用服务的注解路径, 拼接完整服务路径, 进行服务调用
        // 该接口注解路径必须与服务提供的注解路径一致
        @RequestMapping("/getMember")
        String getMember();
    
    }

\* 调用接口

package com.gupao.zookeeper.controller;
    
    import com.gupao.zookeeper.feign.IMemberFeign;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RestController;
    import org.springframework.web.client.RestTemplate;
    
    /**
     * @author pj_zhang
     * @create 2019-01-15 22:01
     **/
    @RestController
    public class OrderController {
    
        // 注入Feign接口
        @Autowired
        private IMemberFeign memberFeign;
    
        @RequestMapping("/feignToMember")
        public String feignToMember() {
            // 直接通过Feign方法调用实现服务调用
            return memberFeign.getMember();
        }
    
    }

\* 启动Main函数

package com.gupao;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
    import org.springframework.cloud.client.loadbalancer.LoadBalanced;
    import org.springframework.cloud.openfeign.EnableFeignClients;
    import org.springframework.context.annotation.Bean;
    import org.springframework.web.client.RestTemplate;
    
    /**
     * @author pj_zhang
     * @create 2019-01-15 21:56
     **/
    @SpringBootApplication
    // 通过Zookeeper注册中心进行服务注册和发现
    @EnableDiscoveryClient
    // 通过声明式Feign方式调用服务
    @EnableFeignClients
    public class ZookeeperClientApp {
    
        public static void main(String[] args) {
            SpringApplication.run(ZookeeperClientApp.class, args);
        }
    
        @Bean
        @LoadBalanced
        public RestTemplate restTemplate() {
            return new RestTemplate();
        }
    
    }

\* 启动效果

![20190115225547929.png][]

![20190115225555728.png][]

[20190115223524880.png]: /images/20220326/07591748d56648f9973bba885f86c99d.png
[20190115223924273.png]: /images/20220326/df96f5ba54c44f94aa647735af49b04e.png
[https_blog.csdn.net_u011976388_article_details_81259886]: https://blog.csdn.net/u011976388/article/details/81259886
[20190115224247154.png]: /images/20220326/ae776130bf7f4c26ba2d1555aa92f941.png
[2019011522493272.png]: /images/20220326/029649799a5c4a1a98a65d9a7567e1d4.png
[20190115224938873.png]: /images/20220326/029472e5f4614890aee028a616cce15f.png
[20190115225122404.png]: /images/20220326/24013f4b4f4d4b9f8b53bf0a685cc126.png
[20190115225547929.png]: /images/20220326/85d5f637bfd54542ae8e8eb93705220c.png
[20190115225555728.png]: /images/20220326/608ffd4f726741df8550f79f7ac6c5bc.png