Springboot2.X集成Druid连接池，并进行监控

项目中集成了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>

现在Springboot已经发布了starter二者选一即可

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

2.配置属性

application.properties 或 application.yml 本项目选用properties

# 数据库和数据源 
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连接池,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
# 配置获取连接等待超时的时间
spring.datasource.maxWait=60000
# 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒
spring.datasource.timeBetweenEvictionRunsMillis=60000
# 配置一个连接在池中最小生存的时间，单位是毫秒
spring.datasource.minEvictableIdleTimeMillis=300000
spring.datasource.validationQuery=SELECT 1
spring.datasource.testWhileIdle=true
spring.datasource.testOnBorrow=false
spring.datasource.testOnReturn=false
# 打开PSCache，并且指定每个连接上PSCache的大小
spring.datasource.poolPreparedStatements=true
spring.datasource.maxPoolPreparedStatementPerConnectionSize=20
# 配置监控统计拦截的filters，去掉后监控界面sql无法统计，'wall'用于防火墙
spring.datasource.filters=stat,wall,log4j
# 通过connectProperties属性来打开mergeSql功能；慢SQL记录
spring.datasource.connectionProperties=druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000
# 合并多个DruidDataSource的监控数据
spring.datasource.useGlobalDataSourceStat=true
#Druid监控账号
druid.acount=admin
#Druid监控密码
druid.password=admin

各个配置属性说明在阿里的Druid GitHub上有介绍，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
各个配置属性参考值，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，直接上代码

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配置项
 */
@Configuration
public class DruidConfig {
    @Value("${druid.acount}")
    private String acount;
    @Value("${druid.password}")
    private String password;
    /**
     * 实现sql监控的配置数据源
     */
    @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/*");
         //白名单：
        reg.addInitParameter("allow", "127.0.0.1");
        //IP黑名单（同时存在时，deny优先于allow）
        //如果满足deny，就提示：sorry，you are not permitted to view this page
        reg.addInitParameter("deny", "192.168.1.73");
        //无需登录密码，注释以下两行即可
        //reg.addInitParameter("loginUsername", acount);
        //reg.addInitParameter("loginPassword", password);
        reg.addInitParameter("resetEnable", "false");
        return reg;
    }

    /**
     * 拦截器bean注册
     * @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.对于SpringBoot的启动类，加入注解：@ServletComponentScan

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

5.访问测试

输入地址：http://127.0.0.1:8082/druid/login.html 使用配置的用户名密码登录


至此Springboot集成Druid连接池及监考完成
请注意：网上有人说Druid长时间的监控开启会导致内存占用过多