1.Nacos安装启动

LINUX NACOS 快速启动

2.nacos添加配置

Data ID:需要应用在配置

3.添加依赖【pom.xml】

<?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>2.2.2.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.lhy</groupId>
    <artifactId>cloud-api</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>cloud-api</name>
    <description>cloud-api</description>
    <properties>
        <java.version>1.8</java.version>
        <spring-cloud.version>2.2.2.RELEASE</spring-cloud.version>
        <spring-nacos.version>2.2.1.RELEASE</spring-nacos.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</artifactId>
        </dependency>
 
        <!-- nacos 注册中心 -->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
            <version>${spring-nacos.version}</version>
        </dependency>
        <!-- nacos 配置中心 -->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
            <version>${spring-nacos.version}</version>
        </dependency>
        <!-- springcloud -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-commons</artifactId>
            <version>${spring-cloud.version}</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>

4.配置【bootstrap.yml】

server:
  port: 12315
 
spring:
  application:
    name: cloud-api
  cloud:
    nacos:
      discovery:
        server-addr: 127.0.0.1:8848
      config:
        server-addr: 127.0.0.1:8848
        prefix: doctor-dev
        file-extension: yml

核心配置

config:server-addr: 127.0.0.1:8848               配置中心地址
file-extension: yml                                         配置文件格式 
prefix                                                             配置文件前缀

Data ID = ${prefix}.${file-extension}  默认为${spring:application:name}+${spring:profiles:active: dev}.${file-extension}

Nacos配置中心的配置必须在bootstrap.yml或者bootstrap-xx.yml中配置，一个算是主要原因的原因：bootstrap.yml的优先级高于application.yml。

5.启动类

@SpringBootApplication
@EnableDiscoveryClient
public class CloudApiApplication {
 
    public static void main(String[] args) {
        SpringApplication.run(CloudApiApplication.class, args);
    }
 
}

6.测试

/**
 * Class description.
 *
 * @author ocean liu
 * @createTime 2021/11/29 - 10:57
 */
@RequestMapping("/user")
@RestController
@RefreshScope // 支持动态更新
public class UserController {
 
    @Value("${user.headPortrait:123.png}")
    private String headPortrait;
 
    @GetMapping("/headPortrait")
    public String headPortrait(){
        return headPortrait;
    }
 
}

@RefreshScope                                             支持动态更新（类上注解）
@Value("${user.headPortrait:123.png}")        默认123.png

7.验证

Springcloud 集成 Nacos注册中心