1. 
    <bean id ="dataSource" class="org.springframework.jdbc.datasource.SimpleDriverDataSource">
        <property name="driverClass" value="${jdbc.driverClassName}" />
        <property name="url" value="${jdbc.url}" />
        <property name="username" value="${jdbc.username}" />
        <property name="password" value="${jdbc.password}" />
    </bean>
2.
<context:property-placeholder location="classpath:conf.properties"/>
3.
src > conf.properties
# JDBC : WEB-INF/applicatioContext.xml
jdbc.driverClassName=oracle.jdbc.driver.OracleDriver
jdbc.url=jdbc:oracle:thin:@192.168.0.1:1521:tns_name
jdbc.username=user
jdbc.password=password