一：直接使用context命名空间

<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"

xmlns:websocket="http://www.springframework.org/schema/websocket"

xsi:schemaLocation="http://www.springframework.org/schema/beans

http://www.springframework.org/schema/beans/spring-beans.xsd

http://www.springframework.org/schema/websocket

http://www.springframework.org/schema/websocket/spring-websocket.xsd

http://www.springframework.org/schema/context

http://www.springframework.org/schema/context/spring-context.xsd">

 

 

<context:property-placeholder location="classpath:log4j.properties" />  

 

二：在配置文件中配置PropertyPlaceholderConfigurer

<bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">

<property name="locations" value="classpath:jdbc.properties" />

</bean>

 

实例：