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 () ; } }
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SimplestMVCInSpring.zip( 1,201 k)