datasource配置有很多种，我介绍的一种是采用c3p0的，它的百科地址是：
http://baike.baidu.com/view/920062.htm
<!-- spring加载资源文件 -->
<bean name="propertiesConfig"
class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="locations">
<list>
<value>classpath:jdbc.properties</value>
</list>
</property>
</bean>
<!-- 数据源配置 -->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<property name="driverClass" value="${datasource.driverClassName}" />
<property name="jdbcUrl" value="${datasource.url}" />
<property name="user" value="${datasource.user}" />
<property name="password" value="${datasource.password}" />
<property name="minPoolSize" value="${datasource.minPoolSize}" />
<property name="maxPoolSize" value="${datasource.maxPoolSize}" />
<property name="maxIdleTime" value="${datasource.maxIdleTime}" />
<property name="acquireIncrement" value="${datasource.acquireIncrement}" />
<property name="maxStatements" value="${datasource.maxStatements}" />
<property name="initialPoolSize" value="${datasource.initialPoolSize}" />
<property name="idleConnectionTestPeriod" value="${datasource.idleConnectionTestPeriod}" />
<property name="acquireRetryAttempts" value="${datasource.acquireRetryAttempts}" />
<property name="breakAfterAcquireFailure" value="${datasource.breakAfterAcquireFailure}" />
<property name="testConnectionOnCheckout" value="${datasource.testConnectionOnCheckout}" />
</bean>
下面是jdbc.properties的配置：
#datasource.driverClass=oracle.jdbc.driver.OracleDriver
datasource.driverClassName=com.mysql.jdbc.Driver
datasource.url=jdbc\:mysql\://192.168.1.1\:3306/xxx
datasource.user=root
datasource.password=123456
#Optional
datasource.minPoolSize=1
datasource.maxPoolSize=50
datasource.maxIdleTime=25000
datasource.acquireIncrement=2
datasource.maxStatements=0
datasource.initialPoolSize=2
datasource.idleConnectionTestPeriod=25000
datasource.acquireRetryAttempts=30
datasource.breakAfterAcquireFailure=true
datasource.testConnectionOnCheckout=true
