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:

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

<?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.

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26

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.