SpringCloud使用Zookeeper作為注冊中心
服務(wù)注冊
引入相關(guān)依賴:
<?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,這里直接啟動三個ZkdemoApplication運行三個zkdemo服務(wù)示例。
啟動成功后,在zookeeper中查看節(jié)點的變化,會發(fā)現(xiàn)在根節(jié)點下多出來一個services節(jié)點,services節(jié)點下是以服務(wù)名稱命名的服務(wù)節(jié)點,服務(wù)節(jié)點下是該服務(wù)的實例節(jié)點。
[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
實例節(jié)點中存儲了服務(wù)名稱、ip地址、端口號、實例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ephemeralOwner字段可以看出,services節(jié)點和服務(wù)節(jié)點為持久節(jié)點,實例節(jié)點為臨時節(jié)點:
[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
當某個實例出現(xiàn)故障停止時,對應(yīng)的臨時節(jié)點也會被刪除。當服務(wù)節(jié)點下所有實例節(jié)點被刪除時,服務(wù)節(jié)點也會被刪除。當services節(jié)點下的所有服務(wù)節(jié)點被刪除時,services節(jié)點也會被刪除。
服務(wù)發(fā)現(xiàn)
通過DiscoveryClient從注冊中心獲取對應(yīng)服務(wù)的實例列表:
@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(jié)果:
http://localhost:64401 http://localhost:64475 http://localhost:64514
服務(wù)調(diào)用這里就不演示了,可以使用Feign或RestTemplate進行調(diào)用。
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