利用nacos做注册中心

#1、下载nacos server端

https://github.com/alibaba/nacos/releases

2、启动服务

sh startup.sh -m standalone
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3、配置父类项目

3.1配置pom

父类项目pom文件

<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>4.0.0modelVersion>
    <groupId>com.examplegroupId>
    <artifactId>demo-nacosartifactId>
    <version>0.0.1-SNAPSHOTversion>
    <name>demo-nacosname>
    <packaging>pompackaging>
    <description>demo-nacosdescription>
    
    <parent>
        <groupId>org.springframework.bootgroupId>
        <artifactId>spring-boot-starter-parentartifactId>
        <version>2.3.2.RELEASEversion>
    parent>
    <properties>
        <maven.compiler.source>8maven.compiler.source>
        <maven.compiler.target>8maven.compiler.target>
        
        <spring-cloud.version>Hoxton.SR9spring-cloud.version>
        <spring-cloud-alibaba.version>2.2.6.RELEASEspring-cloud-alibaba.version>
    properties>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloudgroupId>
                <artifactId>spring-cloud-dependenciesartifactId>
                <version>${spring-cloud.version}version>
                <type>pomtype>
                <scope>importscope>
            dependency>
            <dependency>
                <groupId>com.alibaba.cloudgroupId>
                <artifactId>spring-cloud-alibaba-dependenciesartifactId>
                <version>${spring-cloud-alibaba.version}version>
                <type>pomtype>
                <scope>importscope>
            dependency>
        dependencies>

    dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-webartifactId>
        dependency>
        <dependency>
            <groupId>com.alibaba.cloudgroupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discoveryartifactId>
        dependency>
        <dependency>
            <groupId>org.projectlombokgroupId>
            <artifactId>lombokartifactId>
        dependency>
    dependencies>
project>
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4、注册服务提供者【可拓展多个，过程类似】

4.1 pom.xml

<parent>
        <groupId>com.examplegroupId>
        <artifactId>demo-nacosartifactId>
        <version>0.0.1-SNAPSHOTversion>
    parent>
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4.2 配置文件

# 服务名
spring.application.name=nacos-provider
spring.cloud.nacos.discovery.server-addr=127.0.0.1:8848
server.port=7001
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4.3启动类

添加@EnableDiscoveryClient注解

@SpringBootApplication
@EnableDiscoveryClient
public class NacosProvider7001Application {
    public static void main(String[] args) {
        SpringApplication.run(NacosProvider7001Application.class, args);
    }
}
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4.4 对外接口

@RestController
public class ProviderController {
    @GetMapping("/login")
    public String login(String name) {
        return "欢迎您 " + name + " 这里是7001";
    }
}
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5注册服务消费者【使用ribbon做负载均】

5.1 pom.xml

<parent>
        <groupId>com.examplegroupId>
        <artifactId>demo-nacosartifactId>
        <version>0.0.1-SNAPSHOTversion>
    parent>
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5.2 配置文件

# 服务名
spring.application.name=nacos-client-ribbon-8001
spring.cloud.nacos.discovery.server-addr=127.0.0.1:8848
server.port=8001
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5.3启动类

添加@EnableDiscoveryClient注解

@SpringBootApplication
@EnableDiscoveryClient
public class NacosClientRibbon8001Application {

    @Bean
    @LoadBalanced
    public RestTemplate getRestTemplate() {
        return new RestTemplate();
    }

    public static void main(String[] args) {
        SpringApplication.run(NacosClientRibbon8001Application.class, args);
    }

}
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5.4 调用服务

@RestController
public class GetProviderController {
    @Resource
    RestTemplate restTemplate;
    private static final String URL = "http://nacos-provider/";

    @GetMapping("/login")
    public String login(String name) {
        return restTemplate.getForObject(URL + "login?name=" + name, String.class);
    }
}
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6 利用nacos做注册中心

6.1 添加依赖

<properties>
  <java.version>1.8java.version>
  <project.build.sourceEncoding>UTF-8project.build.sourceEncoding>
  <project.reporting.outputEncoding>UTF-8project.reporting.outputEncoding>
  <spring-boot.version>2.3.7.RELEASEspring-boot.version>
properties>

<dependency>
  <groupId>com.alibaba.cloudgroupId>
  <artifactId>spring-cloud-starter-alibaba-nacos-configartifactId>
dependency>

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6.2配置文件

注意配置文件最好先设置多环境，因为nacos的文件名命名规范为 applicationName-环境.文件后缀 比如【aaa-dev.properties】

如果不指定环境可能会有问题

• application.properties

spring.profiles.active=dev
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• application-dev.properties

  spring.application.name=nacos-config
  server.port=6001
  spring.cloud.nacos.discovery.server-addr=127.0.0.1:8848
  spring.cloud.nacos.config.server-addr=127.0.0.1:8848
  spring.cloud.nacos.config.file-extension=properties
  
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6.3 获取配置

@RestController
@RefreshScope//动态更新
public class DemoController {
    @Value("${name}")
    String name;
    @GetMapping("getName")
    public String getName() {
        return name;
    }
}
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• 启动类

@SpringBootApplication
@EnableDiscoveryClient
public class NacosConfig6001Application {

    public static void main(String[] args) {
        SpringApplication.run(NacosConfig6001Application.class, args);
    }

}
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​

6.4 macos配置

配置管理–》配置列表—》右上角加号-》

Data ID： nacos-config-dev.properties

文件类型选properties

配置内容：

name=test_nacos_config
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点击发布启动并访问项目

http://localhost:6001/getName

6.5 nacos的namespace、dataid、group

dataid 和服务实例对应 格式固定【applicationName-环境.文件后缀】

namespace、group ：可添加多个通过配置文件划分

spring.cloud.nacos.config.namespace=80986fb8-24c0-4d3d-b1ff-84da7fba4394
spring.cloud.nacos.config.group=dev
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