【SpringCloud】07 Zookeeper01 服务注册

Zookeeper环境搭建：

需要服务器Linux，或者虚拟机环境支持

从官网的目录下载最新版本的Zookeeper： https://downloads.apache.org/zookeeper/stable/ 

下载方式：

使用wget命令直接下载到Linux： wget https://downloads.apache.org/zookeeper/stable/apache-zookeeper-3.5.8-bin.tar.gz 

或者直接下载到本地传输给Linux： https://downloads.apache.org/zookeeper/stable/apache-zookeeper-3.5.8-bin.tar.gz 

安装：

解压Zookeeper的Tar包文件： tar -zxvf apache-zookeeper-3.5.8-bin.tar.gz 

 

其他准备

远程访问时注意关闭防火墙拦截： systemctl stop firewalld 

不放心就检查一下防火墙状态： systemctl status firewalld 

查看Linux的IP地址，保证远程访问的正常： ifconfig / ip addr 

测试Ping本机连接： ping 192.168.2.174（ 你的WindowsIP ） 

 

回到本机，开始模块编写

1、新建模块，模块名称： Provider-Payment-Zookeeper-Port-8004

2、导入该模块需要的依赖：

<dependencies>
    <dependency>
        <groupId>cn.dzz.springcloud</groupId>
        <artifactId>API-Commons</artifactId>
        <version>${project.version}</version> <!--<version>1.0-SNAPSHOT</version>
    </dependency>
    <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.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>

编写application.yml：

server:
  port: 8004

spring:
  application:
    name: provider-payment-service
  cloud:
    zookeeper:
      connect-string: 你的ZK所在的IP地址:2181

编写主程序启动类：

package cn.dzz.springcloud;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;

/**
 * @author DaiZhiZhou
 * @file SpringCloud-ATGG-2020
 * @create 2020-08-26 10:09
 */
@SpringBootApplication
@EnableDiscoveryClient
public class ProviderPaymentZookeeperServicePort8004 {

    public static void main(String[] args) {
        SpringApplication.run(ProviderPaymentZookeeperServicePort8004.class, args);
    }
}

编写一个流水订单的控制器：

package cn.dzz.springcloud.controller;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.UUID;

/**
 * @author DaiZhiZhou
 * @file SpringCloud-ATGG-2020
 * @create 2020-08-26 10:11
 */
@RestController
@Slf4j
@RequestMapping("payment")
public class PaymentController {
    
    @Value("${server.port}")
    private String serverPort;
    
    @RequestMapping("zk")
    public String paymentZookeeper(){
        return "SpringCloud with Zookeeper : " + serverPort + "\t" + UUID.randomUUID().toString(); 
    }
    
}

启动Zookeeper

发现3.5.8的ZK配置文件没有直接配置，我们需要复制重命名一份才可以启动：

切换conf配置目录： cd /root/apache-zookeeper-3.5.8-bin/conf 

复制配置文件： cp -r zoo_sample.cfg zoo.cfg 

切换到Bin目录下面： cd /root/apache-zookeeper-3.5.8-bin/bin 

启动ZK服务： ./zkServer.sh start 

使用ZK客户端访问： ./zkCli.sh 

可以看到默认的端口是2181

/usr/bin/java
Connecting to localhost:2181

查看ZK下面的节点：

然后启动8004服务运行测试：

虽然我的服务启动正常，但是视频中出现了ZK版本不一致导致的问题。

 

解决版本冲突问题就是排除依赖版本，导入指定的依赖版本

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-zookeeper-discovery</artifactId>
 4     <exclusions>
 5         <exclusion>
 6             <groupId>org.apache.zookeeper</groupId>
 7             <artifactId>zookeeper</artifactId>
 8         </exclusion>
 9     </exclusions>
</dependency>
11 <dependency>
12     <groupId>org.apache.zookeeper</groupId>
13     <artifactId>zookeeper</artifactId>
14     <version>3.5.8</version>
15 </dependency>

 

现在测试接口：

http://localhost:8004/payment/zk
SpringCloud with Zookeeper : 8004 f9b005f6-0a21-4cc2-a195-1cf8f59ed0e2

访问测试是成功的，每一次访问接口，序列号都会不一样

 

在Linux的ZK客户端中，我们这样访问节点：

ls /services/provider-payment-service

显示：

获取节点的详细信息：

get /services/provider-payment-service/f5358aa6-6846-40d2-a781-79785d9d0b93

可以看到返回的是一个JSON字符串：

格式化之后的样子：

{
    "name": "provider-payment-service",
    "id": "f5358aa6-6846-40d2-a781-79785d9d0b93",
    "address": "localhost",
    "port": 8004,
    "sslPort": null,
    "payload": {
        "@class": "org.springframework.cloud.zookeeper.discovery.ZookeeperInstance",
        "id": "application-1",
        "name": "provider-payment-service",
        "metadata": {}
    },
    "registrationTimeUTC": 1598408815125,
    "serviceType": "DYNAMIC",
    "uriSpec": {
        "parts": [{
            "value": "scheme",
            "variable": true
        }, {
            "value": "://",
            "variable": false
        }, {
            "value": "address",
            "variable": true
        }, {
            "value": ":",
            "variable": false
        }, {
            "value": "port",
            "variable": true
        }]
    }
}

 

到这里就算成功注册了服务到Zookeeper中