Springboot2.X集成Druid連接池，並進行監控

項目中集成了Druid但是利用率一直很低，整理一下集成思路

程序配置

1.Maven引入Druid

pom.xml文件增加

<dependency>
	<groupId>com.alibaba</groupId>
	<artifactId>druid</artifactId>
	<version>1.0.25</version>
</dependency>

現在Springboot已經發布了starter二者選一即可

<dependency>
   <groupId>com.alibaba</groupId>
   <artifactId>druid-spring-boot-starter</artifactId>
   <version>1.1.10</version>
</dependency>

2.配置屬性

application.properties 或 application.yml 本項目選用properties

# 數據庫和數據源 
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/test?allowMultiQueries=true&useUnicode=true&characterEncoding=UTF-8
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
# druid連接池,初始化大小，最小，最大
spring.datasource.initialSize=20
spring.datasource.name="sys"
spring.datasource.minIdle=20
spring.datasource.maxActive=80
# 配置獲取連接等待超時的時間
spring.datasource.maxWait=60000
# 配置間隔多久才進行一次檢測，檢測需要關閉的空閒連接，單位是毫秒
spring.datasource.timeBetweenEvictionRunsMillis=60000
# 配置一個連接在池中最小生存的時間，單位是毫秒
spring.datasource.minEvictableIdleTimeMillis=300000
spring.datasource.validationQuery=SELECT 1
spring.datasource.testWhileIdle=true
spring.datasource.testOnBorrow=false
spring.datasource.testOnReturn=false
# 打開PSCache，並且指定每個連接上PSCache的大小
spring.datasource.poolPreparedStatements=true
spring.datasource.maxPoolPreparedStatementPerConnectionSize=20
# 配置監控統計攔截的filters，去掉後監控界面sql無法統計，'wall'用於防火牆
spring.datasource.filters=stat,wall,log4j
# 通過connectProperties屬性來打開mergeSql功能；慢SQL記錄
spring.datasource.connectionProperties=druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000
# 合併多個DruidDataSource的監控數據
spring.datasource.useGlobalDataSourceStat=true
#Druid監控賬號
druid.acount=admin
#Druid監控密碼
druid.password=admin

各個配置屬性說明在阿里的Druid GitHub上有介紹，地址：https://github.com/alibaba/druid/wiki/DruidDataSource%E9%85%8D%E7%BD%AE%E5%B1%9E%E6%80%A7%E5%88%97%E8%A1%A8
各個配置屬性參考值，地址：
https://github.com/alibaba/druid/wiki/%E9%85%8D%E7%BD%AE_DruidDataSource%E5%8F%82%E8%80%83%E9%85%8D%E7%BD%AE

3.增加Druid的基本配置，直接上代碼

import org.springframework.beans.factory.annotation.Value;
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 com.alibaba.druid.pool.DruidDataSource;
import com.alibaba.druid.support.http.StatViewServlet;
import com.alibaba.druid.support.http.WebStatFilter;
/**
 * Druid配置項
 */
@Configuration
public class DruidConfig {
    @Value("${druid.acount}")
    private String acount;
    @Value("${druid.password}")
    private String password;
    /**
     * 實現sql監控的配置數據源
     */
    @Bean
    @ConfigurationProperties(prefix="spring.datasource")
    public DruidDataSource druidDataSource() {
        return new DruidDataSource();
    }

    @Bean
    public ServletRegistrationBean druidServlet() {
        ServletRegistrationBean reg = new ServletRegistrationBean();
        reg.setServlet(new StatViewServlet());
        reg.addUrlMappings("/druid/*");
         //白名單：
        reg.addInitParameter("allow", "127.0.0.1");
        //IP黑名單（同時存在時，deny優先於allow）
        //如果滿足deny，就提示：sorry，you are not permitted to view this page
        reg.addInitParameter("deny", "192.168.1.73");
        //無需登錄密碼，註釋以下兩行即可
        //reg.addInitParameter("loginUsername", acount);
        //reg.addInitParameter("loginPassword", password);
        reg.addInitParameter("resetEnable", "false");
        return reg;
    }

    /**
     * 攔截器bean註冊
     * @return
     */
    @Bean
    public FilterRegistrationBean filterRegistrationBean() {
        FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean();
        filterRegistrationBean.setFilter(new WebStatFilter());
        filterRegistrationBean.addUrlPatterns("/*");
        filterRegistrationBean.addInitParameter("exclusions", "*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*");
        return filterRegistrationBean;
    }
}

4.對於SpringBoot的啓動類，加入註解：@ServletComponentScan

/**
 * springboot 入口
 */
@ServletComponentScan
@SpringBootApplication
public class Application {
	public static void main(String[] args) {
		SpringApplication.run(Application.class, args);
		System.out.println("...系統管理...啓動成功......");
	}
}

5.訪問測試

輸入地址：http://127.0.0.1:8082/druid/login.html 使用配置的用戶名密碼登錄


至此Springboot集成Druid連接池及監考完成
請注意：網上有人說Druid長時間的監控開啓會導致內存佔用過多