https://blog.csdn.net/blueboz/article/details/54808915
classpath下新建一个cfg.properties

cfg.properties配置文件的内容

username=jay    
password=123

spring配置

<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

    <bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <!-- 对于读取一个配置文件采取的方案 -->
        <property name="location" value="classpath:cfg.properties"></property>
        <!-- 对于读取两个以上配置文件采取的处理方案 -->
        <!--
        <property name="locations"> 
            <list>
                <value>classpath:cfg.properties</value>
                <value>classpath:cfg2.properties</value>
            </list>
        </property>
        -->
    </bean>
</beans>

测试代码

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:applicationCtx.xml")
public class SpringCtxTst {


    @Value("${username}")
    private String uname;

    @Value("${password}")
    private String pwd;

    @Test
    public void test(){
        System.out.println("username:"+uname);
        System.out.println("password:"+pwd);
    }
}

另外的一个解决方案

<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-3.2.xsd">
    <!--采用这种方式简化配置文件-->
    <context:property-placeholder location="classpath:cfg.properties,classpath:cfg2.properties"/>

</beans>