[转]阿里巴巴数据库连接池 druid配置详解

一、背景

java程序很大一部分要操作数据库，为了提高性能操作数据库的时候，又不得不使用数据库连接池。数据库连接池有很多选择，c3p、dhcp、proxool等，druid作为一名后起之秀，凭借其出色的性能，也逐渐映入了大家的眼帘。接下来本教程就说一下druid的简单使用。

二、jar包下载、配置详解及配置示例

1. jar包获取

可以从/maven2/com/alibaba/druid/下载最新的jar包。如果想使用最新的源码编译，也可以从/alibaba/druid下载源码，然后使用maven命令行，或者导入到IDEA中进行编译获得。从maven的仓库中获取

<dependency><groupId>com.alibaba</groupId><artifactId>druid</artifactId><version>1.1.6</version></dependency>

2. 配置示例

spring.xml文件中加入：

<?xml version="1.0" encoding="UTF-8"?><beans xmlns="/schema/beans"xmlns:xsi="/2001/XMLSchema-instance"xsi:schemaLocation="/schema/beans /schema/beans/spring-beans-3.2.xsd"><bean name = "transactionManager"

class ="org.springframework.jdbc.datasource.DataSourceTransactionManager" ><property name = "dataSource" ref = "dataSource" ></ property ></bean ><bean id = "propertyConfigurer"

class ="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer" ><property name = "locations" ><list><value > /WEB-INF/classes/dbconfig.properties </ value ></list></property></bean><!-- 阿里 druid 数据库连接池 --><bean id = "dataSource" class = "com.alibaba.druid.pool.DruidDataSource" destroy-method = "close" ><!-- 数据库基本信息配置 --><property name = "url" value = "${jdbc.url}" /><property name = "username" value = "${jdbc.username}" /><property name = "password" value = "${jdbc.password}" /><property name = "driverClassName" value = "${jdbc.driverClassName}" /><property name = "filters" value = "${jdbc.filters}" /><!-- 最大并发连接数 --><property name = "maxActive" value = "${jdbc.maxActive}" /><!-- 初始化连接数量 --><property name = "initialSize" value = "${jdbc.initialSize}" /><!-- 配置获取连接等待超时的时间 --><property name = "maxWait" value = "${jdbc.maxWait}" /><!-- 最小空闲连接数 --><property name = "minIdle" value = "${jdbc.minIdle}" /><!-- 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒 --><property name = "timeBetweenEvictionRunsMillis" value ="${jdbc.timeBetweenEvictionRunsMillis}" /><!-- 配置一个连接在池中最小生存的时间，单位是毫秒 --><property name = "minEvictableIdleTimeMillis" value ="${jdbc.minEvictableIdleTimeMillis}" /><property name = "validationQuery" value = "${jdbc.validationQuery}" /><property name = "testWhileIdle" value = "${jdbc.testWhileIdle}" /><property name = "testOnBorrow" value = "${jdbc.testOnBorrow}" /><property name = "testOnReturn" value = "${jdbc.testOnReturn}" /><property name = "maxOpenPreparedStatements" value ="${jdbc.maxOpenPreparedStatements}" /><!-- 打开 removeAbandoned 功能 --><property name = "removeAbandoned" value = "${jdbc.removeAbandoned}" /><!-- 1800 秒，也就是 30 分钟 --><property name = "removeAbandonedTimeout" value ="${jdbc.removeAbandonedTimeout}" /><!-- 关闭 abanded 连接时输出错误日志 --><property name = "logAbandoned" value = "${jdbc.logAbandoned}" /></bean></beans>

dbconfig.properties

jdbc.url=jdbc:mysql://localhost:3306/newmjdbc.driverClassName=com.mysql.jdbc.Driverjdbc.username=rootjdbc.password=rootjdbc.filters=statjdbc.maxActive=20jdbc.initialSize=1jdbc.maxWait=60000jdbc.minIdle=10jdbc.maxIdle=15jdbc.timeBetweenEvictionRunsMillis=60000jdbc.minEvictableIdleTimeMillis=300000jdbc.validationQuery=SELECT 'x'jdbc.testWhileIdle=truejdbc.testOnBorrow=falsejdbc.testOnReturn=falsejdbc.maxOpenPreparedStatements=20jdbc.removeAbandoned=truejdbc.removeAbandonedTimeout=1800jdbc.logAbandoned=true

web.xml

<!-- 连接池 启用 Web 监控统计功能 start--><filter><filter-name>DruidWebStatFilter</filter-name><filter-class>com.alibaba.druid.support.http.WebStatFilter</filter-class><init-param><param-name>exclusions</param-name><param-value>*.js ,*.gif ,*.jpg ,*.png ,*.css ,*.ico ,/druid/*</param-value></init-param></filter><filter-mapping><filter-name>DruidWebStatFilter</filter-name><url-pattern>/*</url-pattern></filter-mapping><servlet><servlet-name>DruidStatView</servlet-name><servlet-class>com.alibaba.druid.support.http.StatViewServlet</servlet-class></servlet><servlet-mapping><servlet-name>DruidStatView</servlet-name><url-pattern>/druid/*</url-pattern></servlet-mapping><!-- 连接池 启用 Web 监控统计功能 end-->

访问监控页面：http://ip:port/projectName/druid/index.html.

3.druid的配置项详解