springboot项目集成Nacos配置中心实现配置化和动态刷新，
优势：配置文件外部化，支持多环境配置管理，修改配置只需重启服务，无需发版。
劣势：系统庞大时，配置文件很多，多人开发，配置格式不统一，维护麻烦；敏感配置不需要暴露给开发人员，降低风险，但开发经常要和运维沟通怎么修改配置，沟通不恰当容易引发生产事故；而且，如果应用部署在多台机器，对运维来说，修改配置也是非常头疼的事情（当然也可以引入NFS系统来解决一部分问题）。

新建springboot项目

pom文件

  1. <?xml version="1.0" encoding="UTF-8"?>
  2. <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  3.          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
  4.   <modelVersion>4.0.0</modelVersion>
  5.   <parent>
  6.     <groupId>org.springframework.boot</groupId>
  7.     <artifactId>spring-boot-starter-parent</artifactId>
  8.     <version>2.3.4.RELEASE</version>
  9.     <relativePath/> <!-- lookup parent from repository -->
  10.   </parent>
  11.   <groupId>com.clown</groupId>
  12.   <artifactId>clown</artifactId>
  13.   <version>0.0.1-SNAPSHOT</version>
  14.   <name>clown</name>
  15.   <description>Demo project for Spring Boot</description>
  17.   <dependencies>
  18.     <dependency>
  19.       <groupId>org.springframework.boot</groupId>
  20.       <artifactId>spring-boot-starter-jdbc</artifactId>
  21.       <exclusions>
  22.         <exclusion>
  23.           <groupId>com.zaxxer</groupId>
  24.           <artifactId>HikariCP</artifactId>
  25.         </exclusion>
  26.       </exclusions>
  27.     </dependency>
  28.     <dependency>
  29.       <groupId>org.springframework.boot</groupId>
  30.       <artifactId>spring-boot-starter-oauth2-client</artifactId>
  31.     </dependency>
  32.     <!--SECURITY-->
  33.     <dependency>
  34.       <groupId>org.springframework.boot</groupId>
  35.       <artifactId>spring-boot-starter-security</artifactId>
  36.     </dependency>
  37.     <!-- https://mvnrepository.com/artifact/org.springframework.security.oauth/spring-security-oauth2 -->
  38.     <dependency>
  39.       <groupId>org.springframework.security.oauth</groupId>
  40.       <artifactId>spring-security-oauth2</artifactId>
  41.       <version>2.5.0.RELEASE</version>
  42.     </dependency>
  44.     <dependency>
  45.       <groupId>org.springframework.boot</groupId>
  46.       <artifactId>spring-boot-starter-web</artifactId>
  47.     </dependency>
  48.     <dependency>
  49.       <groupId>org.springframework.boot</groupId>
  50.       <artifactId>spring-boot-devtools</artifactId>
  51.       <scope>runtime</scope>
  52.       <optional>true</optional>
  53.     </dependency>
  54.     <dependency>
  55.       <groupId>mysql</groupId>
  56.       <artifactId>mysql-connector-java</artifactId>
  57.       <scope>runtime</scope>
  58.     </dependency>
  59.     <dependency>
  60.       <groupId>org.projectlombok</groupId>
  61.       <artifactId>lombok</artifactId>
  62.       <optional>true</optional>
  63.     </dependency>
  64.     <dependency>
  65.       <groupId>org.springframework.boot</groupId>
  66.       <artifactId>spring-boot-starter-test</artifactId>
  67.     </dependency>
  68.     <dependency>
  69.       <groupId>org.springframework.security</groupId>
  70.       <artifactId>spring-security-test</artifactId>
  71.     </dependency>
  72.     <dependency>
  73.       <groupId>com.baomidou</groupId>
  74.       <artifactId>mybatis-plus-boot-starter</artifactId>
  75.       <version>3.4.0</version>
  76.     </dependency>
  77.     <!--json工具-->
  78.     <dependency>
  79.       <groupId>com.alibaba</groupId>
  80.       <artifactId>fastjson</artifactId>
  81.       <version>1.2.47</version>
  82.     </dependency>
  84.     <dependency>
  85.       <groupId>cn.hutool</groupId>
  86.       <artifactId>hutool-all</artifactId>
  87.       <version>5.7.9</version>
  88.     </dependency>
  90.     <!-- https://mvnrepository.com/artifact/com.alibaba/druid-spring-boot-starter -->
  91.     <dependency>
  92.       <groupId>com.alibaba</groupId>
  93.       <artifactId>druid-spring-boot-starter</artifactId>
  94.       <version>1.1.10</version>
  95.     </dependency>
  97.     <dependency>
  98.       <groupId>org.apache.poi</groupId>
  99.       <artifactId>poi-ooxml</artifactId>
  100.       <version>4.1.2</version>
  101.     </dependency>
  103.     <!-- nacos -->
  104.     <dependency>
  105.       <groupId>com.alibaba.boot</groupId>
  106.       <artifactId>nacos-config-spring-boot-starter</artifactId>
  107.       <version>${latest.version}</version>
  108.     </dependency>
  110.     <dependency>
  111.       <groupId>com.alibaba.boot</groupId>
  112.       <artifactId>nacos-discovery-spring-boot-starter</artifactId>
  113.       <version>${latest.version}</version>
  114.     </dependency>
  116.   </dependencies>
  118.   <properties>
  119.     <java.version>1.8</java.version>
  120.     <latest.version>0.2.10</latest.version>
  121.   </properties>
  123.   <build>
  124.     <finalName>clown</finalName>
  125.     <resources>
  126.       <resource>
  127.         <directory>src/main/resources</directory>
  128.         <includes>
  129.           <include>**/*.*</include>
  130.         </includes>
  131.         <filtering>false</filtering>
  132.       </resource>
  133.       <resource>
  134.         <directory>src/main/java</directory>
  135.         <includes>
  136.           <include>**/*.*</include>
  137.         </includes>
  138.         <excludes>
  139.           <exclude>**/*.java</exclude>
  140.         </excludes>
  141.         <filtering>false</filtering>
  142.       </resource>
  143.     </resources>
  144.     <plugins>
  145.       <plugin>
  146.         <groupId>org.springframework.boot</groupId>
  147.         <artifactId>spring-boot-maven-plugin</artifactId>
  148.       </plugin>
  149.     </plugins>
  150.   </build>
  152. </project>

配置文件

  1. server:
  2.   port: 8080
  4. spring:
  5.   application:
  6.     name: clown
  8.   datasource:
  9.     type: com.alibaba.druid.pool.DruidDataSource
  10.     driver-class-name: com.mysql.cj.jdbc.Driver
  11.     url: ${clown.datasource.url}
  12.     username: ${clown.datasource.username}
  13.     password: ${clown.datasource.password}
  15. nacos:
  16.   config:
  17.     # 主配置服务器地址
  18.     server-addr: 127.0.0.1:8848
  19.   discovery:
  20.     server-addr: 127.0.0.1:8848
  21.     # 主配置 data-id
  22.     #    data-id: clown-dev.yaml
  23.     # 主配置 group-id
  24.     #    group: DEFAULT_GROUP
  25.     # 主配置 namespace
  26.     #    namespace: clown
  27.     # 主配置 配置文件类型
  28.     #    type: yaml
  29.     # 主配置 最大重试次数
  30.     #    max-retry: 10
  31.     # 主配置 开启自动刷新
  32.     #    auto-refresh: true
  33.     # 主配置 重试时间
  34.     #    config-retry-time: 3000
  35.     # 主配置 配置监听长轮询超时时间
  36.     #    config-long-poll-timeout: 46000
  37.     # 主配置 开启注册监听器预加载配置服务（除非特殊业务需求，否则不推荐打开该参数）
  38. #    enable-remote-sync-config: true
  41. logging:
  42.   level:
  43.     default: debug

启动器

  1. package com.clown;
  3. import com.alibaba.nacos.api.config.ConfigType;
  4. import com.alibaba.nacos.spring.context.annotation.config.NacosPropertySource;
  5. import org.springframework.boot.SpringApplication;
  6. import org.springframework.boot.autoconfigure.SpringBootApplication;
  7. import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
  9. /**
  10.  * @author xq
  11.  */
  12. @SpringBootApplication(exclude = {DataSourceAutoConfiguration.class,})
  13. @NacosPropertySource(dataId = "clown", type = ConfigType.YAML, autoRefreshed = true)
  14. public class ClownApplication {
  16.     public static void main(String[] args) {
  17.         SpringApplication.run(ClownApplication.class, args);
  18.     }
  20. }

注册Nacos

  1. package com.clown.common.config;
  3. import com.alibaba.nacos.api.annotation.NacosInjected;
  4. import com.alibaba.nacos.api.exception.NacosException;
  5. import com.alibaba.nacos.api.naming.NamingService;
  6. import org.springframework.beans.factory.annotation.Value;
  7. import org.springframework.context.annotation.Configuration;
  9. import javax.annotation.PostConstruct;
  11. /**
  12.  * 公共配置
  13.  *
  14.  * @author xq
  15.  * @date 2022年05月09日 11:42
  16.  */
  17. @Configuration
  18. public class NacosConfig {
  19.     @Value("${server.port}")
  20.     private int serverPort;
  21.     @Value("${spring.application.name}")
  22.     private String applicationName;
  23.     @NacosInjected
  24.     private NamingService namingService;
  26.     @PostConstruct
  27.     public void registerInstance() throws NacosException {
  28.         namingService.registerInstance(applicationName, "127.0.0.1", serverPort);
  29.     }
  30. }

启动项目

日志信息：
image.png
说明连接到了配置中心,配置加载成功

验证

测试接口

  1. package com.clown.system.controller;
  3. import javax.servlet.http.HttpServletResponse;
  5. import com.alibaba.nacos.api.config.annotation.NacosValue;
  6. import com.clown.common.config.TestNameConfig;
  7. import org.springframework.web.bind.annotation.GetMapping;
  8. import org.springframework.web.bind.annotation.PostMapping;
  9. import org.springframework.web.bind.annotation.RequestMapping;
  10. import org.springframework.web.bind.annotation.RestController;
  12. import java.io.File;
  13. import java.util.ArrayList;
  14. import java.util.List;
  16. /**
  17.  * @author clown
  18.  */
  19. @RestController
  20. @RequestMapping("/test")
  21. public class TestController {
  22.     @NacosValue(value = "${clown.test.name}", autoRefreshed = true)
  23.     private String name;
  25.     @GetMapping("/getName")
  26.     public String getName() {
  27.         return name;
  28.     }
  29. }

访问接口

image.png
没有问题,配置成功加载

通过Nacos控制台修改配置(项目不用重启,保持运行就可以):

image.png

修改完成后，点击发布》确认发布

再次访问接口

image.png
内容改变,Nacos配置中心的基本使用完成!