SpringBoot使用Nacos动态配置数据源的方法

	<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    <java.version>1.8</java.version>
    <maven-jar-plugin.version>3.1.1</maven-jar-plugin.version>
  </properties>

  <dependencyManagement>
    <dependencies>
      <dependency>
        <groupId>com.alibaba.cloud</groupId>
        <artifactId>spring-cloud-alibaba-dependencies</artifactId>
        <version>2.1.1.RELEASE</version>
        <type>pom</type>
        <scope>import</scope>
      </dependency>
    </dependencies>
  </dependencyManagement>
  <dependencies>
    <dependency>
      <groupId>org.mybatis.spring.boot</groupId>
      <artifactId>mybatis-spring-boot-starter</artifactId>
      <version>2.1.4</version>
    </dependency>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-test</artifactId>
      <scope>test</scope>
      <exclusions>
        <exclusion>
          <groupId>org.junit.vintage</groupId>
          <artifactId>junit-vintage-engine</artifactId>
        </exclusion>
      </exclusions>
    </dependency>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
    </dependency>

    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <scope>runtime</scope>
    </dependency>
    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>druid-spring-boot-starter</artifactId>
      <version>1.1.22</version>
    </dependency>
    <dependency>
      <groupId>com.alibaba.cloud</groupId>
      <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
    </dependency>
    <dependency>
      <groupId>com.alibaba.cloud</groupId>
      <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
    </dependency>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-configuration-processor</artifactId>
      <optional>true</optional>
    </dependency>
    <dependency>
      <groupId>org.projectlombok</groupId>
      <artifactId>lombok</artifactId>
      <optional>true</optional>
      <scope>provided</scope>
      <version>1.18.12</version>
    </dependency>
  </dependencies>

spring:
 application:
 	#这个服务名称与最下面的file-extension: properties合起来
 	#即questionBank.properties为Nacos配置文件的名称
  name: questionBank
 cloud:
  nacos:
   #注册中心
   discovery:
    # 是否启用
    enabled: true
    # nacos服务地址
    server-addr: 127.0.0.1:8848
    # 服务名
    #service: ${spring.application.name}
    # 组名
    group: DEFAULT
    # 权重
    weight: 2
    # 元数据
    metadata:
     auth: sty
     version: 1.0
    # 日志名
    log-name: ${spring.application.name}
    # 是否开启watch
    watch: true
    # 多长时间从服务端拉取一次
    watch-delay: 30000
    # 集群名称
    cluster-name: DEFAULT
    # 是否开启注册，如果为false，不会将自身注册上去
    register-enabled: true
    # https
    secure: false
   #配置中心
   config:
    server-addr: 127.0.0.1:8848
    #个人比较喜欢用properties文件，yaml缩进老出错
    file-extension: properties
server:
 port: 8080

import com.alibaba.druid.pool.DruidDataSource;
import lombok.Data;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.cloud.context.config.annotation.RefreshScope;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
/**
 * @Author：STY
 * @Description: 数据源获取配置（配置中心）
 * @Date：2021/3/17
 */
@Configuration
@RefreshScope
@Data
public class DruidConfiguration {

  @Value("${spring.datasource.druid.url}")
  private String url;

  @Value("${spring.datasource.druid.username}")
  private String username;

  @Value("${spring.datasource.druid.password}")
  private String password;

  @Value("${spring.datasource.druid.url.driverClassName}")
  private String driverClassName;

  @Bean(name="datasource")
  @RefreshScope
  public DruidDataSource dataSource()
  {
    DruidDataSource datasource = new DruidDataSource();
    System.out.println(url);
    datasource.setUrl(this.url);
    datasource.setUsername(username);
    datasource.setPassword(password);
    datasource.setDriverClassName(driverClassName);
    return datasource;
  }
}