1.通过bean读取本地文件中的属性

文件db.propertis

user=root
password=root123
driver=com.mysql.jdbc.Driver
sb=123

<context:property-placeholder location="classpath:db.properties"/>
    <bean id="p1" class="com.igeek.lesson8.Person">
        <property name="userName" value="${user}"></property>
        <property name="password" value="${password}"></property>
        <property name="driver" value="${driver}"></property>
        <property name="sb" value="${sb}"></property>
    </bean>

ApplicationContext ac = new ClassPathXmlApplicationContext("com/igeek/lesson8/beans.xml");
        Person bean = (Person) ac.getBean("p2");
        System.out.println(bean);

输出结果:

Person [userName=root, password=root123, driver=com.mysql.jdbc.Driver, sb=123]