ioc管理jdbc数据源

<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
  <property name="driverClassName" value="com.mysql.cj.jdbc.Drive"></property>
    <property name="url" value="jdbc:mysql://localhost:3306/ssm?serverTimezone=UTC"></property>
 <property name="username" value="root"></property>
    <property name="password" value="xuxjunn1522"></property>
</bean>

从外部导入配置信息
jdbc.property.xml
jdbc.driver = com.mysql.cj.jdbc.Driver
jdbc.url = jdbc:mysql://localhost:3306/ssm?serverTimezone=UTC
jdbc.username = root
jdbc.password = xuxjunn1522

 <context:property-placeholder location="jdbc.properties"></context:property-placeholder>
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="driverClassName" value="${jdbc.driver}"></property>
        <property name="url" value="${jdbc.url}"></property>
        <property name="username" value="${jdbc.username}"></property>
        <property name="password" value="${jdbc.password}"></property>
    </bean>