java code for IoC in properties file

/*
Pro Spring
By Rob Harrop
Jan Machacek
ISBN: 1-59059-461-4
Publisher: Apress
*/


///////////////////////////////////////////////////////////////////////////////////////
//File: beans.properties
# The View
view.class=StandardOutView
view.model(ref)=model

# The Model
model.class=HelloWorldModel

///////////////////////////////////////////////////////////////////////////////////////

public interface View {

public void render();

public void setModel(Model m);
public Model getModel();
}


///////////////////////////////////////////////////////////////////////////////////////

public interface Model {

public String getMessage();
}

///////////////////////////////////////////////////////////////////////////////////////

public class StandardOutView implements View {

private Model model = null;

public void render() {
if (model == null) {
throw new RuntimeException(
"You must set the property model of class:"
+ StandardOutView.class.getName());
}

System.out.println(model.getMessage());
}

public void setModel(Model m) {
this.model = m;
}

public Model getModel() {
return this.model;
}

}

///////////////////////////////////////////////////////////////////////////////////////


public class HelloWorldModel implements Model {

public String getMessage() {

return "Hello World!";
}

}
///////////////////////////////////////////////////////////////////////////////////////

import java.io.FileInputStream;
import java.util.Properties;

import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.support.DefaultListableBeanFactory;
import org.springframework.beans.factory.support.PropertiesBeanDefinitionReader;

public class HelloWorldSpring {

public static void main(String[] args) throws Exception {

// get the bean factory
BeanFactory factory = getBeanFactory();

View v = (View) factory.getBean("view");
Model mp = (Model) factory.getBean("model");

v.setModel(mp);
v.render();
}

private static BeanFactory getBeanFactory() throws Exception {
// get the bean factory
DefaultListableBeanFactory factory = new DefaultListableBeanFactory();

// create a definition reader
PropertiesBeanDefinitionReader rdr = new PropertiesBeanDefinitionReader(
factory);

// load the configuration options
Properties props = new Properties();
props.load(HelloWorldSpring.class.getResource("beans.properties").openStream());

rdr.registerBeanDefinitions(props);

return factory;
}
}