Spring configuration with property files
The Spring configuration files can include values from your properties files. You can easily customize this so that you can take control when the key and or the value of a property is requested. To do so, you must first tell Spring the location of your properties file:
<beans>
<bean class="com.mycompany.MyPropertyPlaceholderConfigurer">
<property name="locations">
<value>classpath:my.properties</value>
</property>
</bean>
...
Next you must create the class:
com.mycompay.MyPropertyPlaceholderConfigurer:
package com.mycompany;
import java.util.Properties;
import org.springframework.beans.factory.config.PropertyPlaceholderConfigurer;
import com.adobe.hs.spdf.common.PropReader;
public class MyPropertyPlaceholderConfigurer extends
PropertyPlaceholderConfigurer {
// process the key and then return the associated value...
protected String resolvePlaceholder(String placeholder, Properties props) {
String value = process-the-key-and-lookup-the-value;
return value;
}
}
Finally, you can use the Spring’s ${...} notation to reference values from your properties file. e.g.,
<bean id="dataSource"
class="org.apache.commons.dbcp.BasicDataSource"
destroy-method="close">
<property name="driverClassName"><value>com.mysql.jdbc.Driver</value></property>
<property name="url"><value>${mysql.server}</value></property>
<property name="username"><value>${mysql.username}</value></property>
<property name="password"><value>${mysql.password}</value></property>
</bean>
