如何在SpringBoot 中使用 Druid 数据库连接池

<dependency>
	<groupid>com.alibaba</groupid>
	<artifactid>druid</artifactid>
	<version>1.1.14</version>
</dependency>
<dependency>
	<groupid>log4j</groupid>
	<artifactid>log4j</artifactid>
	<version>1.2.17</version>
</dependency>

server:
 servlet:
 context-path: /
 session:
  timeout: 60m
 port: 8080

spring:
 datasource:
 url: jdbc:mysql://127.0.0.1:9080/hospital?allowmultiqueries=true&useunicode=true&characterencoding=utf-8&zerodatetimebehavior=converttonull
 username: root
 password: root
 # 环境 dev|test|pro
 profiles:
  active: dev
 driver-class-name: com.mysql.cj.jdbc.driver

 ########################## druid配置 ##########################
 type: com.alibaba.druid.pool.druiddatasource
 # 初始化大小，最小，最大 
 initialsize: 5
 minidle: 1
 maxactive: 20
  # 配置获取连接等待超时的时间 
 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 
 timebetweenevictionrunsmillis: 60000
 # 配置一个连接在池中最小生存的时间，单位是毫秒 
 minevictableidletimemillis: 300000
 # 校验sql，oracle配置 validationquery=select 1 from dual，如果不配validationquery项，则下面三项配置无用 
 validationquery: select 1 from dual
 testwhileidle: true
 testonborrow: false
 testonreturn: false
 # 打开pscache，并且指定每个连接上pscache的大小 
 poolpreparedstatements: true
 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 
 filters: stat,wall,log4j
 # 通过connectproperties属性来打开mergesql功能；慢sql记录 
 connectionproperties: druid.stat.mergesql=true;druid.stat.slowsqlmillis=5000
 # 合并多个druiddatasource的监控数据 
 useglobaldatasourcestat: true
 
# mybatis配置
mybatis:
 mapperlocations: classpath:mapper/*.xml,classpath:mapper/extend/*.xml
 configuration:
 map-underscore-to-camel-case: true
 log-impl: org.apache.ibatis.logging.stdout.stdoutimpl

import java.sql.sqlexception;
import javax.sql.datasource;
import org.apache.log4j.logger;
import org.springframework.beans.factory.annotation.value;
import org.springframework.context.annotation.bean;
import org.springframework.context.annotation.configuration;
import org.springframework.context.annotation.primary;

import com.alibaba.druid.pool.druiddatasource;

@configuration
public class druiddbconfig {
	private logger logger = logger.getlogger(this.getclass());	//log4j日志

	@value("${spring.datasource.url}")
	private string dburl;

	@value("${spring.datasource.username}")
	private string username;

	@value("${spring.datasource.password}")
	private string password;

	@value("${spring.datasource.driver-class-name}")
	private string driverclassname;

	@value("${spring.datasource.initialsize}")
	private int initialsize;

	@value("${spring.datasource.minidle}")
	private int minidle;

	@value("${spring.datasource.maxactive}")
	private int maxactive;

	@value("${spring.datasource.maxwait}")
	private int maxwait;

	@value("${spring.datasource.timebetweenevictionrunsmillis}")
	private int timebetweenevictionrunsmillis;

	@value("${spring.datasource.minevictableidletimemillis}")
	private int minevictableidletimemillis;

	@value("${spring.datasource.validationquery}")
	private string validationquery;

	@value("${spring.datasource.testwhileidle}")
	private boolean testwhileidle;

	@value("${spring.datasource.testonborrow}")
	private boolean testonborrow;

	@value("${spring.datasource.testonreturn}")
	private boolean testonreturn;

	@value("${spring.datasource.poolpreparedstatements}")
	private boolean poolpreparedstatements;

	@value("${spring.datasource.maxpoolpreparedstatementperconnectionsize}")
	private int maxpoolpreparedstatementperconnectionsize;

	@value("${spring.datasource.filters}")
	private string filters;

	@value("{spring.datasource.connectionproperties}")
	private string connectionproperties;

	@bean // 声明其为bean实例
	@primary // 在同样的datasource中，首先使用被标注的datasource
	public datasource datasource() {
		druiddatasource datasource = new druiddatasource();

		datasource.seturl(dburl);
		datasource.setusername(username);
		datasource.setpassword(password);
		datasource.setdriverclassname(driverclassname);

		// configuration
		datasource.setinitialsize(initialsize);
		datasource.setminidle(minidle);
		datasource.setmaxactive(maxactive);
		datasource.setmaxwait(maxwait);
		datasource.settimebetweenevictionrunsmillis(timebetweenevictionrunsmillis);
		datasource.setminevictableidletimemillis(minevictableidletimemillis);
		datasource.setvalidationquery(validationquery);
		datasource.settestwhileidle(testwhileidle);
		datasource.settestonborrow(testonborrow);
		datasource.settestonreturn(testonreturn);
		datasource.setpoolpreparedstatements(poolpreparedstatements);
		datasource.setmaxpoolpreparedstatementperconnectionsize(maxpoolpreparedstatementperconnectionsize);
		try {
			datasource.setfilters(filters);
		} catch (sqlexception e) {
			//logger.error("druid configuration initialization filter", e);
			logger.error("druid configuration initialization filter", e);
			e.printstacktrace();
		}
		datasource.setconnectionproperties(connectionproperties);

		return datasource;
	}

}

import javax.servlet.annotation.webfilter;
import javax.servlet.annotation.webinitparam;
import com.alibaba.druid.support.http.webstatfilter;
@webfilter(filtername="druidwebstatfilter",urlpatterns="/*",
 initparams={
 @webinitparam(name="exclusions",value="*.js,*.gif,*.jpg,*.bmp,*.png,*.css,*.ico,/druid/*")//忽略资源
 }
)
public class druidstatfilter extends webstatfilter {
 }

import javax.servlet.annotation.webinitparam;
import javax.servlet.annotation.webservlet;
 
import com.alibaba.druid.support.http.statviewservlet;
 
@webservlet(urlpatterns="/druid/*",
 initparams={
   @webinitparam(name="allow",value="127.0.0.1,192.168.163.1"),// ip白名单(没有配置或者为空，则允许所有访问)
   @webinitparam(name="deny",value="192.168.1.73"),// ip黑名单 (存在共同时，deny优先于allow)
   @webinitparam(name="loginusername",value="admin"),// 用户名
   @webinitparam(name="loginpassword",value="admin"),// 密码
   @webinitparam(name="resetenable",value="false")// 禁用html页面上的“reset all”功能
})
public class druidstatviewservlet extends statviewservlet {
	private static final long serialversionuid = -2688872071445249539l;
 
}

@springbootapplication()
@mapperscan("cn.china.mytestproject.dao")
//添加servlet组件扫描，使得spring能够扫描到我们编写的servlet和filter
@servletcomponentscan
public class mytestprojectapplication {
 public static void main(string[] args) {
 springapplication.run(mytestprojectapplication.class, args);
 } 
}