案例

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
                           http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
<!--    普通连接-->
<!--    <bean id="druid" class="com.alibaba.druid.pool.DruidDataSource">-->
<!--        <property name="driverClassName" value="com.mysql.jdbc.Driver"/>-->
<!--        <property name="url" value="jdbc:mysql://localhost:3306/coco"/>-->
<!--        <property name="username" value="zcc"/>-->
<!--        <property name="password" value="123456"/>-->
<!--    </bean>-->
<!--    引入外部文件连接-->
    <context:property-placeholder location="classpath:druidLink.properties"/>
    <bean id="druid" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="driverClassName" value="${prop.driverClass}"/>
        <property name="url" value="${prop.url}"/>
        <property name="username" value="${prop.userName}"/>
        <property name="password" value="${prop.password}"/>
    </bean>
</beans>

Java运行

@Test
public void test9() throws SQLException {
    ApplicationContext context = new ClassPathXmlApplicationContext("xmls/BeanDruid.xml");
    DruidDataSource conn = context.getBean("druid", DruidDataSource.class);
    Connection c1 = conn.getConnection();
    c1.close();
}