数据库阿里连接池 druid配置详解

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，有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，也逐渐印入了大家的眼帘。接下来本教程就说一下druid的简单使用。

首先从 http://repo1.maven.org/maven2/com/alibaba/druid/下载最新的jar包。如果想使用最新的源码编译，可以从 https://github.com/alibaba/druid下载源码，然后使用maven命令行，或者导入到eclipse中进行编译。

和dbcp类似，druid的配置项如下

表1.1 配置属性

加入 druid-1.0.9.jar

ApplicationContext.xml

< 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 > 

ApplicationContext.xml配置druid

<!-- 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 = "${url}" />
    < property name = "username" value = "${username}" />
    < property name = "password" value = "${password}" />
    < property name = "driverClassName" value = "${driverClassName}" />
    < property name = "filters" value = "${filters}" />
    <!-- 最大并发连接数 -->
    < property name = "maxActive" value = "${maxActive}" />
    <!-- 初始化连接数量 -->
    < property name = "initialSize" value = "${initialSize}" />
    <!-- 配置获取连接等待超时的时间 -->
    < property name = "maxWait" value = "${maxWait}" />
    <!-- 最小空闲连接数 -->
    < property name = "minIdle" value = "${minIdle}" />
    <!-- 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒 -->
    < property name = "timeBetweenEvictionRunsMillis" value ="${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 ="${minEvictableIdleTimeMillis}" />
    < property name = "validationQuery" value = "${validationQuery}" />
    < property name = "testWhileIdle" value = "${testWhileIdle}" />
    < property name = "testOnBorrow" value = "${testOnBorrow}" />
    < property name = "testOnReturn" value = "${testOnReturn}" />
    < property name = "maxOpenPreparedStatements" value ="${maxOpenPreparedStatements}" />
    <!-- 打开 removeAbandoned 功能 -->
    < property name = "removeAbandoned" value = "${removeAbandoned}" />
    <!-- 1800 秒，也就是 30 分钟 -->
    < property name = "removeAbandonedTimeout" value ="${removeAbandonedTimeout}" />
    <!-- 关闭 abanded 连接时输出错误日志 -->
    < property name = "logAbandoned" value = "${logAbandoned}" />
 </ bean >

dbconfig.properties

url: jdbc:mysql:// localhost :3306/ newm
driverClassName: com.mysql.jdbc.Driver
username: root
password: root
filters: stat
maxActive: 20
initialSize: 1
maxWait: 60000
minIdle: 10
maxIdle: 15
timeBetweenEvictionRunsMillis: 60000
minEvictableIdleTimeMillis: 300000
validationQuery: SELECT 'x'
testWhileIdle: true
testOnBorrow: false
testOnReturn: false
maxOpenPreparedStatements: 20
removeAbandoned: true
removeAbandonedTimeout: 1800
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

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