ZooKeeper是一个分布式服务框架，是Apache Hadoop 的一个子项目，它主要是用来解决分布式应用中经常遇到的一些数据管理问题，如：统一命名服务、状态同步服务、集群管理、分布式应用配置项的管理等
ZooKeeper是一个树形结构的目录服务，支持变更推送
在ZooKeeper中，节点分为两类：
机器节点：
指构成集群的机器
数据节点ZNode：
指数据模型中的数据单元
ZooKeeper将所有数据存储在内存中，数据模型是一棵树(ZNode Tree)，由斜杠（/）进行分割的路径，就是一个ZNode，例如/services/customer
每个ZNode上都会保存自己的数据内容，同时还会保存一系列属性信息
Znode可分为：
持久节点：指一旦这个ZNode被创建了，除非主动进行ZNode的移除操作，否则这个ZNode将一直保存在ZooKeeper上
临时节点：它的生命周期和客户端会话绑定，一旦客户端会话失效，那么这个客户端创建的所有临时节点都会被移除
1.docker安装
docker pull zookeeper:3.5
2.启动
docker run --name zookeeper -p 2181:2181 -d zookeeper:3.5
3.使用
provider
依赖
<properties>
<java.version>1.8</java.version>
<spring-cloud.version>Greenwich.SR3</spring-cloud.version>
</properties>
<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>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>${spring-cloud.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
配置
server.port=8010 spring.application.name=service-provider management.endpoints.web.exposure.include=* management.endpoint.health.show-details=always spring.cloud.zookeeper.connect-string=192.168.99.100:2181
启动类
package com.xyz.provider;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
@EnableDiscoveryClient
@SpringBootApplication
public class ProviderApplication {
public static void main(String[] args) {
SpringApplication.run(ProviderApplication.class, args);
}
}
控制器
package com.xyz.provider.controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class demoController {
@RequestMapping("/hello")
public String Hello() {
return "hello,provider";
}
}
comsumer
添加依赖
<properties>
<java.version>1.8</java.version>
<spring-cloud.version>Hoxton.SR1</spring-cloud.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-openfeign</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-zookeeper-discovery</artifactId>
</dependency>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>${spring-cloud.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
配置
server.port=8015 spring.application.name=service-comsumer management.endpoints.web.exposure.include=* management.endpoint.health.show-details=always feign.client.config.default.connect-timeout=500 feign.client.config.default.read-timeout=500 spring.cloud.zookeeper.connect-string=192.168.99.100:2181
启动类
package com.xyz.comsumer;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
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;
@EnableFeignClients
@SpringBootApplication
public class ComsumerApplication {
public static void main(String[] args) {
SpringApplication.run(ComsumerApplication.class, args);
}
@Bean
@LoadBalanced
public RestTemplate restTemplate() {
return new RestTemplate();
}
}
控制器
package com.xyz.comsumer.controller;
import com.xyz.comsumer.feign.RemoteHelloService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class FeignController {
@Autowired
RemoteHelloService remoteHelloService;
@RequestMapping("feignTest")
public String feignTest() {
String result = remoteHelloService.hello();
if (result == null) {
result = "出错";
}
return result;
}
}
启动provider
启动comsumer
测试 GET http://127.0.0.1:8015/feignTest
输出
hello,provider
4.查看
在docker中进入zookeeper命令行
docker exec -it zookeeper bash
进入zookeeper的bin目录
cd bin
使用zookeeper client访问zookeeper服务
./zkCli.sh
查看当前 ZooKeeper 中所包含的内容
[zk: localhost:2181(CONNECTED) 1] ls / [services, zookeeper]
查看所有services
[zk: localhost:2181(CONNECTED) 2] ls /services [service-comsumer, service-provider]
查看service-comsumer的信息
[zk: localhost:2181(CONNECTED) 13] ls /services/service-comsumer [efac86a0-1d0c-47e8-8f29-998661f50e04]
根据[id]查看相关服务的详细信息
[zk: localhost:2181(CONNECTED) 23] ls /services/service-comsumer
[f8c462b5-a6e6-4861-b20d-e48cdcdda207]
[zk: localhost:2181(CONNECTED) 24] get /services/service-comsumer/f8c462b5-a6e6-4861-b20d-e48cdcdda207
{"name":"service-comsumer","id":"f8c462b5-a6e6-4861-b20d-e48cdcdda207","address":"hkgi-PC","port":8015,"sslPort":null,"payload":{"@class":"org.springframework.cloud.zookeeper.discovery.ZookeeperInstance","id":"service-comsumer-1","name":"service-comsumer","metadata":{}},"registrationTimeUTC":1586917597776,"serviceType"
:"DYNAMIC","uriSpec":{"parts":[{"value":"scheme","variable":true},{"value":"://","variable":false},{"value":"address","variable":true},{"value":":","variable":false},{"value":"port","variable":true}]}}
原文地址：https://www.cnblogs.com/baby123/p/12704649.html
时间： 2024-08-30 10:06:30