Spring Cloud 配置 Nacos

一，下载Nacos 

下载地址：https://github.com/alibaba/nacos/releases

二，启动Nacos

安装Nacos的bin目录下，

执行：startup.cmd -m standalone

然后打开上图红框的地址

三，配置服务

1 配置Nacos

创建命名空间（无论本地还是测试服务期，全部注册到Nacos上，通过命名空间可以区分本地还是测试服务器的服务）

2 创建一个配置文件

test.yml：

记得选择 YAML

spring:
  datasource:
    url: jdbc:mysql://localhost:3306/test1?useSSL=false&useUnicode=true&characterEncoding=utf-8&serverTimezone=UTC
    username: root
    password: root
 
name: hello wrold!!!

四，编写项目

1 项目结构

一个父的pom，一个子项目

父pom

<?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>3.0.2</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.test</groupId>
    <artifactId>nacos_test</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>pom</packaging>
    <name>nacos_test</name>
    <description>nacos_test</description>
    <modules>
        <module>test1</module>
    </modules>
    <properties>
        <java.version>17</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
 
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <!-- Web依赖 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!-- 日志依赖 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-logging</artifactId>
        </dependency>
        <!-- Lombok工具 -->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.30</version>
            <scope>provided</scope>
        </dependency>
        <!-- Actuator可以帮助你监控和管理Spring Boot应用 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <!-- 热部署 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-bootstrap</artifactId>
            <version>3.0.2</version>
        </dependency>
    </dependencies>
 
    <dependencyManagement>
        <dependencies>
            <!--Spring Cloud Alibaba微服务组件的依赖-->
            <dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-alibaba-dependencies</artifactId>
                <version>2022.0.0.0</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>
 
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
 
</project>

2 子项目（test1）

pom

<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>com.test</groupId>
        <artifactId>nacos_test</artifactId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>
 
    <artifactId>test1</artifactId>
 
    <properties>
        <maven.compiler.source>17</maven.compiler.source>
        <maven.compiler.target>17</maven.compiler.target>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>
    <dependencies>
        <!-- mybatis-->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.5.4.1</version>
        </dependency>
 
        <!-- pojo持久化使用 -->
        <dependency>
            <groupId>jakarta.persistence</groupId>
            <artifactId>jakarta.persistence-api</artifactId>
            <version>3.1.0</version>
        </dependency>
 
        <!-- https://mvnrepository.com/artifact/com.mysql/mysql-connector-j -->
        <dependency>
            <groupId>com.mysql</groupId>
            <artifactId>mysql-connector-j</artifactId>
            <version>8.2.0</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>
 
        <!-- 引入alibaba-nacos-config依赖，可以从Nacos配置中心获得配置信息 -->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
            <version>4.0.4</version>
        </dependency>
    </dependencies>
</project>

resource下，创建bootstrap.yml（不是application.yml）

这个yml会找到nacos中，我们前面创建的test.yml

server:
  port: 3000
spring:
  application:
    name: test1
  cloud:
    nacos:
      discovery:
        server-addr: 127.0.0.1:8848   #注册中心地址
        namespace: local_test         #命名空间
      config:
        file-extension: yaml          #文件后缀，只支持 properties 和 yaml
        prefix: test                  #文件名
        namespace: local_test         #命名空间
        auto-refresh: true
        enable-remote-sync-config: true  #启用远程同步配置
        timeout: 3000
        group: DEFAULT_GROUP          #配置组
        refresh-enabled: true
        server-addr: 127.0.0.1:8848   #配置中心地址

启动项：

package com.test;
 
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.openfeign.EnableFeignClients;
 
@SpringBootApplication
@EnableFeignClients
@EnableDiscoveryClient
public class Main {
    public static void main(String[] args) {
        SpringApplication.run(Main.class,args);
    }
}

API：

package com.test.api;
 
import com.alibaba.nacos.api.model.v2.Result;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.cloud.context.config.annotation.RefreshScope;
import org.springframework.web.bind.annotation.*;
 
@RestController
@RequestMapping("api/test")
@RefreshScope
public class ApiTestController {
 
    @Value("${name}")
    private String name;
 
    @RequestMapping(value = "test1", method = RequestMethod.GET)
    @ResponseBody
    public Result test1(){
        return Result.success(name);
    }
}

五，测试

访问：http://localhost:3000/api/test/test1

结果：{"code":0,"message":"success","data":"hello wrold!!!"}

修改nacos中test.yml （无需重启服务）

name: hello!!!
结果：{"code":0,"message":"success","data":"hello!!!"}