参考文档: https://www.cnblogs.com/SimpleWu/p/10049825.html
##导入依赖

<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>druid</artifactId>
    <version>1.1.16</version>
</dependency>

application.yml

#mysql数据源配置
spring:
  datasource:
    url: jdbc:mysql://localhost:3306/shiro?serverTimezone=GMT%2B8&useUnicode=true&characterEncoding=utf8&useSSL=false
    driver-class-name:  com.mysql.cj.jdbc.Driver
    username: root
    password: root
    type: com.alibaba.druid.pool.DruidDataSource
    #   数据源其他配置
    initialSize: 5
    minIdle: 5
    maxActive: 20
    maxWait: 60000
    timeBetweenEvictionRunsMillis: 60000
    minEvictableIdleTimeMillis: 300000
    validationQuery: SELECT 1 FROM DUAL
    testWhileIdle: true
    testOnBorrow: false
    testOnReturn: false
    poolPreparedStatements: true
    #   配置监控统计拦截的filters，去掉后监控界面sql无法统计，
    #   stat:监控统计、'wall'用于防火墙、log4j：日志记录
    #   log4j需要导入依赖
    filters: stat,wall.log4j
    maxPoolPreparedStatementPerConnectionSize: 20
    useGlobalDataSourceStat: true
    connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=500

DruidConfig配置类

package com.common.project3.config;
/**
 * Druid数据的配置类
 */

import com.alibaba.druid.pool.DruidDataSource;
import com.alibaba.druid.support.http.StatViewServlet;
import com.alibaba.druid.support.http.WebStatFilter;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class DruidConfig {

    //DruidDataSource与application.yml的数据源配置绑定起来
    @ConfigurationProperties(prefix = "spring.datasource")
    @Bean
    public DruidDataSource druidDataSource(){
        return new DruidDataSource();
    }

    //后台监控
    @Bean
    public ServletRegistrationBean statViewServlet() {
        ServletRegistrationBean servletRegistrationBean = new ServletRegistrationBean(new StatViewServlet(), "/druid/*");
        // 添加IP白名单(后台要有人登陆，账号和密码配置)
        servletRegistrationBean.addInitParameter("allow", "127.0.0.1");
        // 添加IP黑名单，当白名单和黑名单重复时，黑名单优先级更高
//        servletRegistrationBean.addInitParameter("deny", "127.0.0.1");
        // 添加控制台管理用户
        servletRegistrationBean.addInitParameter("loginUsername", "root");
        servletRegistrationBean.addInitParameter("loginPassword", "root");
        // 是否能够重置数据
        servletRegistrationBean.addInitParameter("resetEnable", "false");
        return servletRegistrationBean;
    }

    //filter
    public FilterRegistrationBean statFilter() {
        FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean(new WebStatFilter());
        // 添加过滤规则
        filterRegistrationBean.addUrlPatterns("/*");
        // 忽略过滤格式
        filterRegistrationBean.addInitParameter("exclusions", "*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*,");
        return filterRegistrationBean;
    }
}

访问druid的数据监控界面

http://localhost:8080/druid/
或者
http://localhost:8080/druid/login