Nacos代替Eureka
Nacos可以直接提供注册中心(Eureka)+配置中心(Config),所以它的好处显而易见。Nacos本身就是一个小平台,它要比之前的Eureka更加方便,不需要我们在自己做配置。
Nacos服务注册中心
服务发现是微服务架构中的关键组件之一。在这样的架构中,手动为每个客户端配置服务列表可能是一项艰巨的任务,并且使得动态扩展极其困难。Nacos Discovery 帮助您自动将您的服务注册到 Nacos 服务器,Nacos 服务器会跟踪服务并动态刷新服务列表。此外,Nacos Discovery 将服务实例的一些元数据,如主机、端口、健康检查 URL、主页等注册到 Nacos。
学习任何知识我们都需要从它的官方文档入手,所以我们直接来看官网给我们提供的文档:https://spring.io/projects/spring-cloud-alibaba#learn
如何引入Nacos Discovery进行服务注册/发现
创建新项目
聚合项目:由于聚合带来的诸多好处,在SpringBoot项目开发中也广泛采用,开发中将SpringBoot项目按照功能分成子模块开发,所以我们在使用Spring Cloud Alibaba完成项目的时候,也是采用聚合项目来完成。
父项目
子项目
POM
父项目pom文件
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| <?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>2.4.10</version> <relativePath/> <!-- lookup parent from repository --> </parent> <groupId>com.mashibing</groupId> <artifactId>SpringCloudAlibabaMSB</artifactId> <version>0.0.1-SNAPSHOT</version> <name>SpringCloudAlibabaMSB</name> <packaging>pom</packaging> <description>SpringCloudAlibabaMSB</description> <properties> <java.version>1.8</java.version> <spring-cloud-alibaba-version>2.2.5.RELEASE</spring-cloud-alibaba-version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-tomcat</artifactId> <scope>provided</scope> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> </dependencies> <dependencyManagement> <dependencies> <dependency> <groupId>com.alibaba.cloud</groupId> <artifactId>spring-cloud-alibaba-dependencies</artifactId> <version>${spring-cloud-alibaba-version}</version> <type>pom</type> <scope>import</scope> </dependency> </dependencies> </dependencyManagement>
<modules> <module>cloudAlibaba-Nacos-9001</module> </modules>
</project>
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子项目pom文件
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| <?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>com.mashibing</groupId> <artifactId>SpringAlibabaMSB</artifactId> <version>0.0.1-SNAPSHOT</version> <relativePath/> <!-- lookup parent from repository --> </parent> <groupId>com.mashibing</groupId> <artifactId>cloudalibaba-nacos-9001</artifactId> <version>0.0.1-SNAPSHOT</version> <name>cloudalibaba-nacos-9001</name> <description>cloudalibaba-nacos-9001</description>
<dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>com.alibaba.cloud</groupId> <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId> </dependency> </dependencies> </project>
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YML
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| server: port: 9001 spring: application: name: nacos-provider cloud: discovery: server-addr: 127.0.0.1:8848
management: endpoint: web: exposure: include:'*'
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启动类
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| package com.mashibing.cloudalibabanacos9001;
import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
@SpringBootApplication @EnableDiscoveryClient public class CloudalibabaNacos9001Application {
public static void main(String[] args) { SpringApplication.run(CloudalibabaNacos9001Application.class, args); }
}
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业务类
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| package com.mashibing.cloudalibabanacos9001.controller;
import org.springframework.beans.factory.annotation.Value; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.PathVariable; import org.springframework.web.bind.annotation.RestController;
@RestController public class DemoController {
@Value("${server.port}") private String serverPort;
@GetMapping(value = "/mashibing") public String getServerPort(){ return "Hello Nacos Discovery"+serverPort; }
}
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测试
注意,在启动项目前一定要启动Nacos