Zookeeper服务注册与发现

学习地址：https://www.bilibili.com/video/BV18E411x7eT?p=28

源码分享：https://github.com/mobiwusihuan288/SpringCloud2020

环境准备

zookeeper版本：3.4.9

下载地址：http://archive.apache.org/dist/zookeeper/zookeeper-3.4.9/

1. 下载安装zookeeper

[root@localhost ~]# cd /usr/local
# 解压
[root@localhost local]# tar -zxvf zookeeper-3.4.9.tar.gz
# 复制一份配置文件
[root@localhost zookeeper-3.4.9]# cp conf/zoo_sample.cfg conf/zoo.cfg

[root@localhost zookeeper-3.4.9]# cd bin

[root@localhost bin]# pwd
/usr/local/zookeeper-3.4.9/bin

2. 关闭防火墙

[root@localhost bin]# systemctl stop firewalld
[root@localhost bin]# systemctl status firewalld

3. 查看IP

[root@localhost bin]# ifconfig

# 192.168.110.128

注册中心Zookeeper

zookeeper是一个分布式协调工具，可以实现注册中心功能

关闭Linux服务器防火墙后启动zookeeper服务器

zookeeper服务器取代Eureka服务器，zk作为服务注册中心

服务提供者

cloud-provider-payment8004

1. 建module

2. 写pom

<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>springcloud2020</artifactId>
        <groupId>com.nuc.springcloud</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>cloud-provider-payment8004</artifactId>

    <dependencies>

        <dependency>
            <groupId>com.nuc.springcloud</groupId>
            <artifactId>cloud-api-commons</artifactId>
            <version>${project.version}</version>
        </dependency>

        <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>

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-zookeeper-discovery</artifactId>
        </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>
</project>

3. 写YML

#8004表示注册到zookeeper服务器的支付服务提供的端口号
server:
  port: 8004
#服务别名-注册zookeeper到注册中心名称
spring:
  application:
    name: cloud-provider-payment
  cloud:
    zookeeper:
      connect-string: 192.168.110.128

4. 主启动类

@SpringBootApplication
//该注解用于向使用consul或zookeeper作为注册中心时注册服务
@EnableDiscoveryClient
public class PaymentMain8004 {
    public static void main(String[] args) {
        SpringApplication.run(PaymentMain8004.class,args);
    }
}

5. Controller

@RestController
@Slf4j
public class PaymentController {

    @Value("${server.port}")
    private String serverPort;

    @GetMapping(value = "/payment/zk")
    public String paymentzk(){
        return "springcloud with zookeeper:"+serverPort+"\t"+ UUID.randomUUID().toString();
    }
}

6. 启动8004

   jar包冲突

​ maven

7. 修改POM

<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-->

<dependency>
    <groupId>org.apache.zookeeper</groupId>
    <artifactId>zookeeper</artifactId>
    <version>3.4.9</version>
</dependency>

8. 启动zookeeper

[root@localhost bin]# ./zkServer.sh start

[root@localhost bin]# ./zkCli.sh

9. 测试

http://localhost:8004/payment/zk

思考：服务节点是临时节点还是持久节点

是临时的

关闭--重启，查看

服务消费者

cloud-consumerzk-order80

参考cloud-provider-payment8004

1. 建module

2. 写POM(参考cloud-provider-payment8004)

3. 写YML

server:
  port: 80

spring:
  application:
    name: cloud-consumer-order
  cloud:
#    注册到zookeeper地址
    zookeeper:
      connect-string: 192.168.110.128

4. 主启动

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

5. 业务类

• bean

@Configuration
public class ApplicationContextConfig {
    @Bean
    @LoadBalanced
    public RestTemplate getRestTemplate(){
        return new RestTemplate();
    }

}

• controller

@RestController
@Slf4j
public class OrderZKController {

    public static final String INVOME_URL = "http://cloud-provider-payment";

    @Resource
    private RestTemplate restTemplate;

    @GetMapping("/consumer/payment/zk")
    public String payment() {
        String result = restTemplate.getForObject(INVOME_URL + "/payment/zk", String.class);
        return result;
    }
}

6. 测试

http://localhost:8004/payment/zk

http://localhost/consumer/payment/zk

zookeeper