• 使用springboot默认的连接池

• 导入springboot data-jdbc依赖

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

• 配置文件配置连接池

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

• springboot默认的连接池

    //java项目www.fhadmin.org
    @Autowired
      DataSource dataSource;
    @Test
    void contextLoads() {
        System.out.println(dataSource.getClass());
        System.out.println("____________________________________");
    }

•  使用连接池druid

• 导入druid依赖

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

• 配置文件配置druid的属性

#java项目www.fhadmin.org
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

• 配置类中对druid属性进行绑定

//java项目www.fhadmin.org
@Configuration
public class DataSource_Druid_Configure {

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

• 配置Druid的监控后台

//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;
    }

•  访问 localhost:8090/druid/login.html

•  如果sql监控失效需要导入log4j 依赖

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