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- SpringCloud使用Zookeeper作為注冊中心
引入相關(guān)依賴(lài)：
<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.4.5</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>zkdemo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>zkdemo</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
<spring-cloud.version>2020.0.2</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>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</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>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
配置文件application.yml：
spring:
cloud:
zookeeper:
# Zookeeper服務(wù)器地址，集群則以逗號分隔
connect-string: localhost:2181
application:
name: zkdemo
# 使用隨機端口
server:
port: 0
主程序類(lèi)ZkdemoApplication：
@SpringBootApplication
public class ZkdemoApplication {
public static void main(String[] args) {
SpringApplication.run(ZkdemoApplication.class, args);
}
}
由于配置了使用隨機端口，這里直接啟動(dòng)三個(gè)ZkdemoApplication運行三個(gè)zkdemo服務(wù)示例。
啟動(dòng)成功后，在zookeeper中查看節點(diǎn)的變化，會(huì )發(fā)現在根節點(diǎn)下多出來(lái)一個(gè)services節點(diǎn)，services節點(diǎn)下是以服務(wù)名稱(chēng)命名的服務(wù)節點(diǎn)，服務(wù)節點(diǎn)下是該服務(wù)的實(shí)例節點(diǎn)。
[zk: localhost:2181(CONNECTED) 96] ls -R / / /services /services/zkdemo /services/zkdemo/2030bca0-db25-411d-b1f5-84c790bd1d6f /services/zkdemo/208834cf-e7e4-496e-a5c0-afcbb78e120f /services/zkdemo/2c4177e1-20fd-4c66-9ee0-eaf21253039d
實(shí)例節點(diǎn)中存儲了服務(wù)名稱(chēng)、ip地址、端口號、實(shí)例ID等相關(guān)信息：
[zk: localhost:2181(CONNECTED) 97] get /services/zkdemo/208834cf-e7e4-496e-a5c0-afcbb78e120f
{"name":"zkdemo","id":"208834cf-e7e4-496e-a5c0-afcbb78e120f","address":"localhost","port":64514,"sslPort":null,"payload":{"@class":"org.springframework.cloud.zookeeper.discovery.ZookeeperInstance","id":"zkdemo","name":"zkdemo","metadata":{"instance_status":"UP"}},"registrationTimeUTC":1619424602784,"serviceType":"DYNAMIC","uriSpec":{"parts":[{"value":"scheme","variable":true},{"value":"://","variable":false},{"value":"address","variable":true},{"value":":","variable":false},{"value":"port","variable":true}]}}
[zk: localhost:2181(CONNECTED) 98] get /services/zkdemo/2030bca0-db25-411d-b1f5-84c790bd1d6f
{"name":"zkdemo","id":"2030bca0-db25-411d-b1f5-84c790bd1d6f","address":"localhost","port":64401,"sslPort":null,"payload":{"@class":"org.springframework.cloud.zookeeper.discovery.ZookeeperInstance","id":"zkdemo","name":"zkdemo","metadata":{"instance_status":"UP"}},"registrationTimeUTC":1619424361059,"serviceType":"DYNAMIC","uriSpec":{"parts":[{"value":"scheme","variable":true},{"value":"://","variable":false},{"value":"address","variable":true},{"value":":","variable":false},{"value":"port","variable":true}]}}
[zk: localhost:2181(CONNECTED) 99] get /services/zkdemo/2c4177e1-20fd-4c66-9ee0-eaf21253039d
{"name":"zkdemo","id":"2c4177e1-20fd-4c66-9ee0-eaf21253039d","address":"localhost","port":64475,"sslPort":null,"payload":{"@class":"org.springframework.cloud.zookeeper.discovery.ZookeeperInstance","id":"zkdemo","name":"zkdemo","metadata":{"instance_status":"UP"}},"registrationTimeUTC":1619424510719,"serviceType":"DYNAMIC","uriSpec":{"parts":[{"value":"scheme","variable":true},{"value":"://","variable":false},{"value":"address","variable":true},{"value":":","variable":false},{"value":"port","variable":true}]}}
通過(guò)ephemeralOwner字段可以看出，services節點(diǎn)和服務(wù)節點(diǎn)為持久節點(diǎn)，實(shí)例節點(diǎn)為臨時(shí)節點(diǎn)：
[zk: localhost:2181(CONNECTED) 100] stat /services cZxid = 0x118 ctime = Mon Apr 26 16:06:02 CST 2021 mZxid = 0x118 mtime = Mon Apr 26 16:06:02 CST 2021 pZxid = 0x119 cversion = 1 dataVersion = 0 aclVersion = 0 ephemeralOwner = 0x0 dataLength = 0 numChildren = 1 [zk: localhost:2181(CONNECTED) 101] stat /services/zkdemo cZxid = 0x119 ctime = Mon Apr 26 16:06:02 CST 2021 mZxid = 0x119 mtime = Mon Apr 26 16:06:02 CST 2021 pZxid = 0x11e cversion = 3 dataVersion = 0 aclVersion = 0 ephemeralOwner = 0x0 dataLength = 0 numChildren = 3 [zk: localhost:2181(CONNECTED) 102] stat /services/zkdemo/2030bca0-db25-411d-b1f5-84c790bd1d6f cZxid = 0x11a ctime = Mon Apr 26 16:06:02 CST 2021 mZxid = 0x11a mtime = Mon Apr 26 16:06:02 CST 2021 pZxid = 0x11a cversion = 0 dataVersion = 0 aclVersion = 0 ephemeralOwner = 0x100000122cf000d dataLength = 514 numChildren = 0
當某個(gè)實(shí)例出現故障停止時(shí)，對應的臨時(shí)節點(diǎn)也會(huì )被刪除。當服務(wù)節點(diǎn)下所有實(shí)例節點(diǎn)被刪除時(shí)，服務(wù)節點(diǎn)也會(huì )被刪除。當services節點(diǎn)下的所有服務(wù)節點(diǎn)被刪除時(shí)，services節點(diǎn)也會(huì )被刪除。
通過(guò)DiscoveryClient從注冊中心獲取對應服務(wù)的實(shí)例列表：
@SpringBootTest
class ZkdemoApplicationTests {
@Autowired
private DiscoveryClient discoveryClient;
@Test
public void serviceUrl() {
List<ServiceInstance> list = discoveryClient.getInstances("zkdemo");
list.stream().forEach(obj -> System.out.println(obj.getUri().toString()));
}
}
輸出結果：
http://localhost:64401 http://localhost:64475 http://localhost:64514
服務(wù)調用這里就不演示了，可以使用Feign或RestTemplate進(jìn)行調用。
以上就是SpringCloud使用Zookeeper作為注冊中心的詳細內容，更多關(guān)于Zookeeper作為注冊中心的資料請關(guān)注腳本之家其它相關(guān)文章！
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