org.springframework.beans.factory.config.PropertyPlaceholderConfigurerをプログラム上で読み込ませる

Main.java

import org.springframework.beans.factory.config.PropertyPlaceholderConfigurer;
import org.springframework.beans.factory.xml.XmlBeanFactory;
import org.springframework.context.support.GenericApplicationContext;
import org.springframework.core.io.ClassPathResource;

public class Main {

    /**
     * @param args
     */
    public static void main(String[] args) {

        XmlBeanFactory factory = new XmlBeanFactory(new ClassPathResource("sample.xml"));
        PropertyPlaceholderConfigurer cfg = new PropertyPlaceholderConfigurer();
        cfg.setLocation(new ClassPathResource("person.properties"));
        cfg.postProcessBeanFactory(factory);
        GenericApplicationContext context = new GenericApplicationContext(factory);

        Person person = (Person) context.getBean("sample");
        System.out.println(person.getName());
        System.out.println(person.getAge());

    }

}

Person.java

public class Person {

	private String name;

	private String age;

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public String getAge() {
		return age;
	}

	public void setAge(String age) {
		this.age = age;
	}

}

sample.properties

person.name=John
person.age=21

sample.xml

<?xml version="1.0" encoding="UTF-8"?>

<beans
    xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:beans="http://www.springframework.org/schema/beans"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:tx="http://www.springframework.org/schema/tx"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
    http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context-2.5.xsd
    http://www.springframework.org/schema/tx
    http://www.springframework.org/schema/tx/spring-tx-2.5.xsd">

    <bean id="sample" class="Person">
        <property name="name" value="${person.name}"/>
        <property name="age"><value>${person.age}</value></property>
    </bean>
        
</beans>