Easy !

<bean id="SAPconnectionProperties" class="org.springframework.beans.factory.config.PropertiesFactoryBean">
<property name="location">

This configuration will create at runtime a Properties object and fill it with the properties contained in sapconnection.properties.
Then i just have to inject this bean in a containing bean, which has indeed a member such as described below :

private Properties SAPconnectionProperties;
And appropriate getter and setter of course...