spring整合c3p0连接池

<!-- 读取db.properties文件 -->
	<context:property-placeholder location="classpath:db.properties"/>
<!-- 配置c3p0连接池 -->
	<bean name="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
		<property name="driverClass" value="${jdbc.driverClass}"></property>
		<property name="user" value="${jdbc.user}"></property>
		<property name="password" value="${jdbc.password}"></property>
		<property name="jdbcUrl" value="${jdbc.jdbcUrl}"></property>
    </bean>
<!-- 读取db.properties文件 -->
	<context:proper