Druid介紹： Druid是阿里巴巴開源平臺(tái)上一個(gè)數(shù)據(jù)庫連接池實(shí)現(xiàn)，它不但結(jié)合了C3P0、DBCP、PROXOOL等數(shù)據(jù)庫連接池的優(yōu)點(diǎn)，同時(shí)還加入了日志監(jiān)控，可以分別監(jiān)控DB池連接和SQL的執(zhí)行情 況，是一款針對(duì)監(jiān)控而生的數(shù)據(jù)庫連接池

環(huán)境：
IDEA版本2017.3.1 x64
JDK1.8
SpringBoot2.1.1
Druid1.1.8

流程概括：

• 利用Spring Initializr創(chuàng)建一個(gè)springboot項(xiàng)目
• pom添加druid數(shù)據(jù)源依賴
• 配置Druid數(shù)據(jù)源屬性文件
• 實(shí)現(xiàn)Druid的配置類
• 啟動(dòng)，訪問localhost:8080/druid 進(jìn)入druid數(shù)據(jù)源監(jiān)控系統(tǒng)

一、利用Spring Initializr（需要連網(wǎng)）創(chuàng)建一個(gè)springboot項(xiàng)目

最后選擇組件時(shí)，把mysql和web勾上

二、pom添加druid數(shù)據(jù)源依賴

在pom.xml添加druid依賴

<dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.8</version>
</dependency>

三、配置Druid數(shù)據(jù)源屬性文件

創(chuàng)建application.yml全局配置文件，配置數(shù)據(jù)源參數(shù)，或者在application.properties配置亦可

spring:
  datasource:
#   數(shù)據(jù)源基本配置
    username: yourusername
    password: yourpassword
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://ip:3306/springboot_druid
    type: com.alibaba.druid.pool.DruidDataSource
#   數(shù)據(jù)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
#   配置監(jiān)控統(tǒng)計(jì)攔截的filters，去掉后監(jiān)控界面sql無法統(tǒng)計(jì)，'wall'用于防火墻
    filters: stat,wall
    maxPoolPreparedStatementPerConnectionSize: 20
    useGlobalDataSourceStat: true
    connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=500

四、實(shí)現(xiàn)Druid的配置類

需要編寫一個(gè)配置類，添加數(shù)據(jù)源組件

@Configuration
public class DruidConfig {

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

    //配置Druid的監(jiān)控
    //1、配置一個(gè)管理后臺(tái)的Servlet
    @Bean
    public ServletRegistrationBean statViewServlet(){
        ServletRegistrationBean bean = new ServletRegistrationBean(new StatViewServlet(), "/druid/*");
        Map<String,String> initParams = new HashMap<>();

        initParams.put("loginUsername","admin");
        initParams.put("loginPassword","123456");
        initParams.put("allow","");//默認(rèn)就是允許所有訪問
        initParams.put("deny","192.168.15.21");

        bean.setInitParameters(initParams);
        return bean;
    }


    //2、配置一個(gè)web監(jiān)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;
    }
}

五、啟動(dòng)springboot應(yīng)用，訪問localhost:8080/druid 進(jìn)入druid數(shù)據(jù)源監(jiān)控系統(tǒng)

訪問成功代表數(shù)據(jù)源整合成功，訪問之前可以編寫持久層訪問數(shù)據(jù)庫，Druid會(huì)顯示sql語句以及執(zhí)行次數(shù)

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