The PropertyPlaceholderConfigurer, implemented as a bean factory post-processor, is used
to externalize some property values from a BeanFactory definition, into another separate
file in Java Properties format.

Create PropertyPlaceholderConfigurer  Programmatically :

<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
  <property name="driverClassName" value="${jdbc.driverClassName}"/>
  <property name="url" value="${jdbc.url}"/>
  <property name="username" value="${jdbc.username}"/>
  <property name="password" value="${jdbc.password}"/>
</bean>

jdbc.driverClassName=org.hsqldb.jdbcDriver
jdbc.url=jdbc:hsqldb:hsql://production:9002
jdbc.username=sa
jdbc.password=root

XmlBeanFactory factory = new XmlBeanFactory(new FileSystemResource("beans.xml"));
PropertyPlaceholderConfigurer cfg = new PropertyPlaceholderConfigurer();
cfg.setLocation(new FileSystemResource("jdbc.properties"));
cfg.postProcessBeanFactory(factory);

By Config :

 <bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <property name="locations">
            <list>
                <value>classpath:your.properties</value>
            </list>
        </property>
        <property name="ignoreUnresolvablePlaceholders" value="true"/>
    </bean>

By Using Util :
<util:properties id="messages" location="classpath:messages.properties"/>

By Using PropertySource :
@Configuration
@PropertySource(name = "someName", value = {"classpath:a.properties", "classpath:b.properties"})
public class MyConfiguration {
}

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