Injecting file dependency into Spring bean

Continuing to explore power of Spring Framework, I would like to explain how to inject file resource into the Spring bean using @Resource annotation.

First of all, let's start with beans definition file. We need basically to declare file dependency we would like to inject:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="
      http://www.springframework.org/schema/beans
      http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">

   <context:annotation-config />   
   <context:component-scan base-package="org.example" />

   <bean id="source" class="org.springframework.core.io.ClassPathResource">
      <constructor-arg index="0" value="some.file.txt" />
   </bean>

</beans>

Having configuration part is ready, we can inject file to a bean.

package org.example;

import java.util.List;

import javax.annotation.Resource;

import org.apache.commons.io.IOUtils;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.io.InputStreamSource;
import org.springframework.stereotype.Component;

@Component
public class SomeBean implements InitializingBean {   
 @Autowired @Resource( name = "source" ) private InputStreamSource source; 
 
 public SomeBean () {
 }
 
 @Override
 public void afterPropertiesSet() throws Exception {
     for( final String line: ( List< String > )IOUtils.readLines( source.getInputStream() ) ) {
                // do something here    
     }
 }
}

That's it :)
Pretty easy and powerful technique.