pom.xml

        <!-- Druid 数据库连接池 -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.2.23</version>
        </dependency>

application.yml

spring:
  jackson:
    date-format: yyyy-MM-dd HH:mm:ss
    time-zone: GMT+8
  datasource:
    type: com.alibaba.druid.pool.DruidDataSource
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://localhost:3306/spring_boot_demo?useUnicode=true&characterEncoding=utf-8&useSSL=true&serverTimezone=Asia/Shanghai
    username: root
    password: 123456
    druid:
      initial-size: 5
      min-idle: 1
      max-wait: 60000
      stat-view-servlet:
      	# 可视化页面
        enabled: true
        # 可视化界面用户名
        login-username: admin
        # 可视化界面密码
        login-password: admin
        # 可视化界面地址前缀
        url-pattern: "/druid/*"
      web-stat-filter:
        enabled: true
        url-pattern: "/*"
        exclusions: "*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*"
      filter:
        stat:
          enabled: true
          # 数据库类型
          db-type: mysql
          # 记录慢SQL
          log-slow-sql: true
          # 默认慢SQL为500ms，这里改成2ms
          slow-sql-millis: 2

启动并执行一条SQL后打开监控页面

8080是你的SpringBoot项目端口

http://localhost:8080/druid/index.html

执行一条SQL

打开SQL监控页面查看慢SQL