三、zookeeper

zookeeper安装

参考地址： zookeeper单机和集群版安装

配置

服务提供者配置

springboot主启动类上添加注解@EnableDiscoveryClient
maven导入

     <!-- https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-starter-zookeeper-discovery -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-zookeeper-discovery</artifactId>
            <!--排除zk3.5.3 解决版本冲突-->
            <exclusions>
                <exclusion>
                    <groupId>org.apache.zookeeper</groupId>
                    <artifactId>zookeeper</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <!--添加zk 3.4,9版本-->
        <!-- https://mvnrepository.com/artifact/org.apache.zookeeper/zookeeper -->
        <dependency>
            <groupId>org.apache.zookeeper</groupId>
            <artifactId>zookeeper</artifactId>
            <version>3.4.9</version>
        </dependency>

yml配置

server:
  port: 8004

spring:
  application:
    name: cloud-provider-payment
  cloud:
    zookeeper:
      connect-string: 192.168.136.140:2181 #服务端所在的ip地址

服务消费者配置

• springboot启动类添加

@SpringBootApplication
@EnableDiscoveryClient //添加该注解
public class OrderZKMain80 {
   
    public static void main(String[] args) {
   
        SpringApplication.run(OrderZKMain80.class,args);
    }
}

• maven

     <!-- https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-starter-zookeeper-discovery -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-zookeeper-discovery</artifactId>
            <!--排除默认的zk3.5.3-->
            <exclusions>
                <exclusion>
                    <groupId>org.apache.zookeeper</groupId>
                    <artifactId>zookeeper</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <!--添加你使用的zk 3.4,9版本-->
        <!-- https://mvnrepository.com/artifact/org.apache.zookeeper/zookeeper -->
        <dependency>
            <groupId>org.apache.zookeeper</groupId>
            <artifactId>zookeeper</artifactId>
            <version>3.4.9</version>
        </dependency>

• yml配置

server:
  port: 80

spring:
  application:
    name: cloud-consumer-order       #项目名也是服务名
  cloud:
    zookeeper:
      connect-string: 192.168.88.3:2181 # zookeeper服务所在的地址

• 配置 RestTemplate

@Configuration
public class ApplicationContextConfig {
   
    @LoadBalanced #添加该注解负载均衡调用服务
    @Bean
    public RestTemplate getRestTemplate() {
   
        return new RestTemplate();
    }
}

服务提供者和消费者都已经注册完成

启动

• 出现错误
  
• 解决zookeeper版本jar包冲突问题
  
  修改后的pom文件

     <!-- https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-starter-zookeeper-discovery -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-zookeeper-discovery</artifactId>
            <!--排除zk3.5.3-->
            <exclusions>
                <exclusion>
                    <groupId>org.apache.zookeeper</groupId>
                    <artifactId>zookeeper</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <!--添加zk 3.4,9版本-->
        <!-- https://mvnrepository.com/artifact/org.apache.zookeeper/zookeeper -->
        <dependency>
            <groupId>org.apache.zookeeper</groupId>
            <artifactId>zookeeper</artifactId>
            <version>3.4.9</version>
        </dependency>

测试

客户端启动后 zookeeper服务端注册的名

在一台电脑有zookeeper的找到zookeeper\bin下运行该命令连接 服务端
zkCli -server 192.168.88.3:2181

查看注册的服务

服务节点是临时节点还是持久节点

是临时节点 一但zookeeper向客户端进行心跳连接不到(客户端以关闭或与服务zookeeper断开)
zookeeper注销该节点
如下图 客户端关闭一段时间后zookeeper已经注销该服务

客户端开启后重新进行注册服务