application文件

spring:
  application:
    name: 
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    type: com.alibaba.druid.pool.DruidDataSource
    url: jdbc:mysql://localhost:3306/xxx?useSSL=false&useUnicode=true&characterEncoding=UTF-8&serverTimezone=GMT%2B8
    username: root
    password: root
    druid:
      initial-size: 5 #连接池初始化大小
      min-idle: 10 # 最小空闲连接数
      max-active: 20 # 最大连接数
      web-stat-filter:
        exclusions: "*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*"     # 不统计这些请求数据
      stat-view-servlet: # 访问监控网页的登录用户名和密码
        enabled: true    # 新版默认值是 false, 需要手动打开
        login-username: root
        login-password: 123456
        reset-enable: true
        allow: ""        # 允许所有ip访问

DruidConfig

@Configuration
public class DruidConfig {

    /*
        将自定义的Druid数据源添加到容器中，不再让springboot自动创建
     */
    // javax.sql.DataSource
    @ConfigurationProperties(prefix = "spring.datasource")
    @Bean
    public DataSource druidDataSource() {
        return new DruidDataSource();
    }
}

测试

@SpringBootTest
class SportManageApiApplicationTests {

    @Autowired
    DataSource dataSource;
    @Test
    void contextLoads() throws SQLException {
        System.out.println(dataSource.getClass());
        Connection connection = dataSource.getConnection();
        System.out.println(connection);
        DruidDataSource dataSource = (DruidDataSource) this.dataSource;
        System.out.println(dataSource.getMaxActive());
    }
}

配置成功！