废话不多说直接上代码

1. 首先创建一个spring boot maven项目

2. pom文件增加依赖

   <?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>2.3.9.RELEASE</version>
           <relativePath/> <!-- lookup parent from repository -->
       </parent>
       <groupId>com.example</groupId>
       <artifactId>nacosDemo</artifactId>
       <version>0.0.1-SNAPSHOT</version>
       <name>nacosDemo</name>
       <description>Demo project for Spring Boot</description>
       <properties>
           <java.version>1.8</java.version>
       </properties>
       <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-config</artifactId>
               <version>2.2.3.RELEASE</version>
           </dependency>
   
           <dependency>
               <groupId>com.alibaba.cloud</groupId>
               <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
               <version>2.2.3.RELEASE</version>
           </dependency>
   
           <dependency>
               <groupId>org.springframework.boot</groupId>
               <artifactId>spring-boot-starter-test</artifactId>
               <scope>test</scope>
           </dependency>
       </dependencies>
   
       <build>
           <plugins>
               <plugin>
                   <groupId>org.springframework.boot</groupId>
                   <artifactId>spring-boot-maven-plugin</artifactId>
               </plugin>
           </plugins>
       </build>
   
   </project>
   
   

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3. 在application.properties文件中添加配置

   spring.application.name=agent
   spring.cloud.nacos.config.server-addr=127.0.0.1:8848
   spring.cloud.nacos.discovery.server-addr=127.0.0.1:8848
   //定义配置文件后缀为.properties
   spring.cloud.nacos.config.file-extension=properties
   //此处为自定义命名空间,下面会有说明
   spring.cloud.nacos.config.namespace=29de6443-9f76-4c4b-9ff2-f754961365d4
   //此处为自定义分组,下面有说明
   spring.cloud.nacos.config.group=OLD_GROUP
   

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4. 在启动类里面加上

   @EnableDiscoveryClient
   

5. 在配置类上面添加实现当前类属性动态更新

   @RefreshScope
   

   package com.example.nacosdemo;
   
   import org.springframework.beans.factory.annotation.Value;
   import org.springframework.boot.SpringApplication;
   import org.springframework.boot.autoconfigure.SpringBootApplication;
   import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
   import org.springframework.cloud.context.config.annotation.RefreshScope;
   import org.springframework.web.bind.annotation.RequestMapping;
   import org.springframework.web.bind.annotation.RestController;
   
   @SpringBootApplication
   @RefreshScope
   @RestController
   @EnableDiscoveryClient
   public class NacosDemoApplication {
   
       public static void main(String[] args) {
           SpringApplication.run(NacosDemoApplication.class, args);
       }
   
       @Value("${redis.host}")
       private String config;
   
       @RequestMapping("/getValue")
       public String getValue() {
           return config;
       }
   }
   
   

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6. 官网下载nacos-server,启动nacos

7. 创建命名空间
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8. 创建dataid,配填写配置
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9. 完成以上操作即可顺利启动