Simplest Usage of property config file In Spring


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



///////////////////////////////////////////////////////////////////////////////////////
//File: msf.properties

renderer.class=StandardOutView
provider.class=HelloWorldModel


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

public interface Model {

  public String getMessage();
}



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


public interface View {

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


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



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;

public class MessageSupportFactory {

    private static MessageSupportFactory instance = null;

    private Properties props = null;

    private View renderer = null;

    private Model provider = null;

    private MessageSupportFactory() {
        props = new Properties();

        try {
            props.load( MessageSupportFactory.class.getResource("msf.properties").openStream());

            // get the implementation classes
            String rendererClass = props.getProperty("renderer.class");
            String providerClass = props.getProperty("provider.class");

            renderer = (View) Class.forName(rendererClass).newInstance();
            provider = (Model) Class.forName(providerClass).newInstance();
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }

    static {
        instance = new MessageSupportFactory();
    }

    public static MessageSupportFactory getInstance() {
        return instance;
    }

    public View getView() {
        return renderer;
    }

    public Model getModel() {
        return provider;
    }

}



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

public class HelloWorldDecoupledWithFactory {

    public static void main(String[] args) {
        View mr = MessageSupportFactory.getInstance().getView();
        Model mp = MessageSupportFactory.getInstance().getModel();
        mr.setModel(mp);
        mr.render();
    }
}
SimplestMVCInSpring.zip( 1,201 k)
Related examples in the same category

1.	IoC XML Config
2.	Load Bean Definition From XML File
3.	Lookup Demo
4.	IoC in properties file
Simplest Usage of property config file In Spring : IoC Config « Spring « Java

Related examples in the same category
