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

引入配置文件

<?xml version="1.0" encoding="UTF-8"?>

<context:property-placeholder location="classpath:properties/database.properties" />

druid配置

<bean id="oracleDataSource" class="com.alibaba.druid.pool.DruidDataSource" destroy-method="close">
	<property name="driverClassName" value="${jdbc.oracle.dirver}" />
	<property name="url" value="${jdbc.oracle.url}" />
	<property name="username" value="${jdbc.oracle.username}" />
	<property name="password" value="${jdbc.oracle.password}" />
	<property name="filters" value="${jdbc.oracle.filters}" />
	<!-- 最大并发连接数 -->
	<property name="maxActive" value="${jdbc.oracle.maxActive}" />
	<!-- 初始化连接数量 -->
	<property name="initialSize" value="${jdbc.oracle.initialSize}" />
	<!-- 配置获取连接等待超时的时间 -->
	<property name="maxWait" value="${jdbc.oracle.maxWait}" />
	<!-- 最小空闲连接数 -->
	<property name="minIdle" value="${jdbc.oracle.minIdle}" />
	<!-- 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒 -->
	<property name = "timeBetweenEvictionRunsMillis" value ="${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>

database.properties

# oracle
jdbc.oracle.dirver = oracle.jdbc.OracleDriver
jdbc.oracle.url = jdbc:oracle:thin:@192.168.1.1:1521:test
jdbc.oracle.username = test
jdbc.oracle.password = test
jdbc.oracle.filters = stat
jdbc.oracle.maxActive = 20
jdbc.oracle.initialSize = 1
jdbc.oracle.maxWait = 60000
jdbc.oracle.minIdle = 10
jdbc.oracle.maxIdle = 15  
jdbc.oracle.timeBetweenEvictionRunsMillis = 60000
jdbc.oracle.minEvictableIdleTimeMillis = 300000
jdbc.oracle.validationQuery = SELECT 'x' 
jdbc.oracle.testWhileIdle = true
jdbc.oracle.testOnBorrow = false
jdbc.oracle.testOnReturn = false
jdbc.oracle.maxOpenPreparedStatements = 20
jdbc.oracle.removeAbandoned = true
jdbc.oracle.removeAbandonedTimeout = 1800
jdbc.oracle.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-->