1.匯入Druid依賴

<dependency>
     <groupId>com.alibaba</groupId>
     <artifactId>druid</artifactId>
     <version>1.1.21</version>
</dependency>

2.編寫application.yml配置檔案

spring:
  datasource:
    username: xxx
    password: xxx
    url: jdbc:mysql://localhost:3306/資料庫名?serverTimezone=UTC
 
&useUnicode=true&characterEncoding=utf-8&useSSL=true
    driver-class-name: com.mysql.cj.jdbc.Driver
    type: com.alibaba.druid.pool.DruidDataSource

    #Spring Boot 預設是不注入這些屬性值的，需要自己繫結
    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
    #配置監控統計攔截的filters，stat:監控統計、log4j：日誌記錄、wall：防禦sql注入
    #如果允許時報錯 java.lang.ClassNotFoundException:org.apache.log4j.Priority 
    #則匯入 log4j 依賴即可
    filters: stat,wall,log4j
    maxPoolPreparedStatementPerConnectionSize: 20
    useGlobalDataSourceStat: true
    connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=500
 

3.在application.yml裡配置Druid資料來源其他引數後並不會生效，我們需要編寫配置類，向容器裡注入元件

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;

import javax.servlet.Filter;
import javax.servlet.ServletRegistration;
import javax.sql.DataSource;
import java.util.HashMap;

@Configuration
public class DruidConfig {
    @Bean
    @ConfigurationProperties(prefix = "spring.datasource")
    public DataSource druidDataSource(){
        return new DruidDataSource();
    }
    //後臺監控
    @Bean
    public ServletRegistrationBean statviewservlet(){
        ServletRegistrationBean<StatViewServlet> bean = new ServletRegistrationBean<>(new StatViewServlet(), "/druid/*");
        //後臺需要有人登陸，賬號密碼配置
        HashMap<String, String> initParameters = new HashMap<>();
        //登陸的key是固定的loginUsername  loginPassword
        initParameters.put("loginUsername","admin");
        //允許誰可以訪問
        initParameters.put("allow","localhost");
        /**禁止誰能訪問
        *initParameters.put("xxxx","xxxx");
        */
        initParameters.put("loginPassword","123456");
        bean.setInitParameters(initParameters);;//設定初始化引數
        return bean;
    }
      //filter
     @Bean
     public FilterRegistrationBean webStartFilter(){
        FilterRegistrationBean<Filter> bean = new FilterRegistrationBean<>();
        bean.setFilter(new WebStatFilter());
        //可以過濾哪些請求
        HashMap<String, String> initParamters = new HashMap<>();
        initParamters.put("exclusion","*.js,*.css,/druid/*");
        bean.setInitParameters(initParamters);
        return bean;
    }
}

4.訪問localhost:8080/druid可以檢視監控資訊