Spring Cloud Alibaba Nacos 服务提供者注册

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

image-20210916145558297

image-20210916145707907

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

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​ 子项目

image-20210916175756108

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>

​ 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>

YML

image-20210916180029680

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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:'*'

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//加此注解
public class CloudalibabaNacos9001Application {

public static void main(String[] args) {
SpringApplication.run(CloudalibabaNacos9001Application.class, args);
}

}

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;
}

}

测试

注意,在启动项目前一定要启动Nacos

image-20210916180252032