<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jdbc</artifactId>
        </dependency>

spring:
  datasource:
    username: root
    password: 5201314
    url: jdbc:mysql:///jqmb?serverTimezone=UTC
    driver-class-name: com.mysql.cj.jdbc.Driver

@Autowired
      DataSource dataSource;
    @Test
    void contextLoads() {
        System.out.println(dataSource.getClass());
        System.out.println("____________________________________");
    }

<dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.0.18</version>
        </dependency>

spring:
  datasource:
    username: root
    password: 5201314
    url: jdbc:mysql:///jqmb?serverTimezone=UTC
    driver-class-name: com.mysql.cj.jdbc.Driver
    type: com.alibaba.druid.pool.DruidDataSource
    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
    filters: stat,wall,log4j
    maxPoolPreparedStatementPerConnectionSize: 20
    useGlobalDataSourceStat: true
    connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=500

@Configuration
public class DataSource_Druid_Configure {

    @ConfigurationProperties(prefix = "spring.datasource")
    @Bean
    public DruidDataSource getDataSour(){
        return new DruidDataSource();
    }

 //配置Druid的监控
    //1、配置一个管理后台的Servlet
    @Bean
    public ServletRegistrationBean statViewServlet(){
        ServletRegistrationBean bean = new ServletRegistrationBean(new StatViewServlet(), "/druid/*");
        Map<String,String> initParams = new HashMap<>();

        initParams.put("loginUsername","admin");//登录用户名
        initParams.put("loginPassword","123456");//登录密码
        initParams.put("allow","");//默认就是允许所有访问
        initParams.put("deny","192.168.15.21");//拒绝访问

        bean.setInitParameters(initParams);
        return bean;
    }


    //2、配置一个web监控的filter
    @Bean
    public FilterRegistrationBean webStatFilter(){
        FilterRegistrationBean bean = new FilterRegistrationBean();
        bean.setFilter(new WebStatFilter());
        Map<String,String> initParams = new HashMap<>();
        initParams.put("exclusions","*.js,*.css,/druid/*");
        bean.setInitParameters(initParams);
        bean.setUrlPatterns(Arrays.asList("/*"));

        return  bean;
    }

   <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
        </dependency>