How to use Property placeholder in Spring XML to load from properties file ?

If you need to read properties file in your Spring application, all you need is to configure a PropertyPlaceholderConfigurer bean in your application context.

Setup your properties in a property file (Example: project.properties)

# project.properties - DB Info

jdbc.driver=org.hsqldb.jdbcDriver

jdbc.url=jdbc:hsqldb: db/myapp

jdbc.user=sa

jdbc.password=xsx

jdbc.maxConnections=25

Setup and use these properties in Spring configuration XML file

<bean id="propertyConfigurer"

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

    <property name="location">

        <value>classpath:project.properties</value>

     </property>

</bean>

<bean id="dataSource" 

 class="org.springframework.jdbc.datasource.DriverManagerDataSource"> 

    <property name="driverClassName">

        <value>${jdbc.driver}</value>

    </property>

    <property name="url">

         <value>${jdbc.url}</value>

    </property>

    <property name="username">

         <value>${jdbc.user}</value>

    </property>

    <property name="password">

         <value>${jdbc.password}</value>

    </property>

</bean>