IoC = Inversion of Control

<project xmlns="http://maven.apache.org/POM/4.0.0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
                        http://maven.apache.org/xsd/maven-4.0.0.xsd">
 
 <modelVersion>4.0.0</modelVersion>
 <groupId>ictdiscovery</groupId>
 <artifactId>HelloSpring</artifactId>
 <version>0.0.1-SNAPSHOT</version> 

     <dependencies>
       <!-- Spring Core -->
       <!-- http://mvnrepository.com/artifact/org.springframework/spring-core -->
       <dependency>
           <groupId>org.springframework</groupId>
           <artifactId>spring-core</artifactId>
           <version>4.1.4.RELEASE</version>
       </dependency>
     
       <!-- Spring Context -->
       <!-- http://mvnrepository.com/artifact/org.springframework/spring-context -->
       <dependency>
           <groupId>org.springframework</groupId>
           <artifactId>spring-context</artifactId>
           <version>4.1.4.RELEASE</version>
       </dependency>    
   </dependencies>

</project>

package ictdiscovery.spring.helloworld;
/*
 * author ictDiscovery
 * Vesion 1.0 Jul 8, 2016
 */
public interface HelloWorld {
 
  public void sayHello();
 
}

package ictdiscovery.spring.helloworld;
/*
 * author ictDiscovery
 * Vesion 1.0 Jul 8, 2016
 */
public class HelloWorldService {
private HelloWorld helloWorld;

  public HelloWorldService() {

  }
  public void setHelloWorld(HelloWorld helloWorld) {
      this.helloWorld = helloWorld;
  }
  public HelloWorld getHelloWorld() {
      return this.helloWorld;
  }
}

package ictdiscovery.spring.helloworld.impl;
import ictdiscovery.spring.helloworld.HelloWorld;
/*
 * author ictDiscovery
 * Vesion 1.0 Jul 8, 2016
 */
public class SpringHelloWorld implements HelloWorld {
public void sayHello() {
      System.out.println("Spring Say Hello!!");
  }
}

package ictdiscovery.spring.helloworld.impl;
import ictdiscovery.spring.helloworld.HelloWorld;
/*
 * author ictDiscovery
 * Vesion 1.0 Jul 8, 2016
 */
public class StrutsHelloWorld implements HelloWorld {

  public void sayHello() {
      System.out.println("Struts Say Hello!!");
  }
}

package ictdiscovery.spring;
import ictdiscovery.spring.helloworld.HelloWorld;
import ictdiscovery.spring.helloworld.HelloWorldService;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
/*
 * author ictDiscovery
 * Vesion 1.0 Jul 8, 2016
 */
public class HelloProgram {
public static void main(String[] args) {
     
      ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");
     
      HelloWorldService service = (HelloWorldService) context.getBean("helloWorldService");
     
      HelloWorld hw= service.getHelloWorld();
     
      hw.sayHello();
  }
}

<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.xsd">

   <bean id="springHelloWorld"
       class="ictdiscovery.spring.helloworld.impl.SpringHelloWorld"></bean>
   <bean id="strutsHelloWorld"
       class="ictdiscovery.spring.helloworld.impl.StrutsHelloWorld"></bean>

   <bean id="helloWorldService"
       class="ictdiscovery.spring.helloworld.HelloWorldService">
       <property name="helloWorld" ref="springHelloWorld" />
   </bean>

</beans>