1 Nacos配置中心简介

Nacos架构包含两个模块，分别是Config Service和Naming Service；其中Config Service用于实现配置中的核心模块，它实现了对配置的CRUD、版本管理、灰度管理、监听管理、推送轨迹、聚合数据等功能。

1.1 Nacos集成Spring Boot实现统一配置管理

• 创建父容器，修改pom.xml

<packaging>pom</packaging>
    <!--统一版本-->
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
        <!-- spring boot -->
        <spring-boot.version>2.4.2</spring-boot.version>
        <!-- spring cloud -->
        <spring-cloud.version>2020.0.1</spring-cloud.version>
        <spring-cloud-alibaba.version>2021.1</spring-cloud-alibaba.version>
        <!-- db && orm -->
        <mysql.version>8.0.19</mysql.version>
        <druid.version>1.2.4</druid.version>
        <mybatis-plus.version>3.4.3</mybatis-plus.version>
        <!-- tools -->
        <lombok.version>1.18.24</lombok.version>
        <hutool.version>5.8.5</hutool.version>
        <!--自定义依赖库版本-->
        <project.version>1.0-SNAPSHOT</project.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>${lombok.version}</version>
        </dependency>
        <dependency>
            <groupId>cn.hutool</groupId>
            <artifactId>hutool-all</artifactId>
            <version>${hutool.version}</version>
        </dependency>
    </dependencies>
    <dependencyManagement>
        <dependencies>
            <!--Spring Cloud 相关依赖-->
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <!--Spring Cloud & Alibaba 相关依赖-->
            <dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-alibaba-dependencies</artifactId>
                <version>${spring-cloud-alibaba.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <!-- SpringBoot 依赖配置 -->
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>${spring-boot.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <!--持久层依赖配置-->
            <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
                <version>${mysql.version}</version>
            </dependency>
            <dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>druid-spring-boot-starter</artifactId>
                <version>${druid.version}</version>
            </dependency>
            <dependency>
                <groupId>com.baomidou</groupId>
                <artifactId>mybatis-plus-boot-starter</artifactId>
                <version>${mybatis-plus.version}</version>
            </dependency>
            <!--自定义通用模块-->
        </dependencies>
    </dependencyManagement>
    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>${java.version}</source>
                    <target>${java.version}</target>
                    <encoding>${project.build.sourceEncoding}</encoding>
                </configuration>
            </plugin>
        </plugins>
        <resources>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.xml</include>
                </includes>
                <filtering>true</filtering>
            </resource>
            <resource>
                <directory>src/main/resources</directory>
                <filtering>true</filtering>
            </resource>
        </resources>
    </build>

• 创建自定义模块，修改pom.xml

<dependencies>
        <!-- 配置读取 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-configuration-processor</artifactId>
        </dependency>
        <!-- Spring Cloud & Alibaba -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-bootstrap</artifactId>
        </dependency>
        <!-- 注册中心 -->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-loadbalancer</artifactId>
        </dependency>
        <!-- 配置中心 -->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>       
    </dependencies>
    <build>
        <finalName>${project.artifactId}</finalName>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

• 创建配置文件 resources/bootstrap.yml

server:
  port: 8001
spring:
  application:
    # 应用程序名称
    name: pingsp-security
  cloud:
    nacos:
      discovery:
        # 服务发现
        server-addr: localhost:8848
      config:
        # 配置服务器
        server-addr: localhost:8848

• 启动类

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

1.2 读取nacos配置信息

• nacos创建配置内容

  
  image.png
• 修改配置文件

server:
  port: 8001
spring:
  application:
    # 应用程序名称
    name: pingsp-security
  cloud:
    nacos:
      discovery:
        # 服务发现
        server-addr: localhost:8848
      config:
        # 配置服务器
        server-addr: localhost:8848
        shared-configs:
          - dataId: ds.yaml
            refresh: true

• 创建读取nacos配置自定义类

package com.pingsp.security.cfg;
import lombok.Data;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.cloud.context.config.annotation.RefreshScope;
import org.springframework.stereotype.Component;
@Data
// 刷新配置
@RefreshScope
@Component
public class RdNacos {
    @Value("${info}")
    private String info;
}

• 创建自定义控制器

package com.pingsp.security.controller;
import com.alibaba.nacos.api.config.annotation.NacosConfigurationProperties;
import com.alibaba.nacos.api.config.annotation.NacosProperty;
import com.alibaba.nacos.api.config.annotation.NacosValue;
import com.pingsp.security.cfg.RdNacos;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RequestMapping("/user")
@RestController
public class UserController {
    @Autowired
    private RdNacos rdNacos;
    @GetMapping("/ok")
    public String ok(){
        return "ok："+rdNacos.getInfo();
    }
}