Hello World Xml With DI : IoC Injection « Spring « Java
- Java
- Spring
- IoC Injection
Hello World Xml With DI
/*
Pro Spring
By Rob Harrop
Jan Machacek
ISBN: 1-59059-461-4
Publisher: Apress
*/
//File: beans.xml
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
<bean id="provider" class="HelloWorldModel">
<constructor-arg>
<value>This is a configurable message</value>
</constructor-arg>
</bean>
<bean id="renderer" class="StandardOutView">
<property name="model">
<ref local="provider"/>
</property>
</bean>
</beans>
///////////////////////////////////////////////////////////////////////////////////////
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 {
String mess;
public HelloWorldModel(String m){
mess = m;
}
public String getMessage() {
return mess;
}
}
///////////////////////////////////////////////////////////////////////////////////////
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.xml.XmlBeanFactory;
import org.springframework.core.io.FileSystemResource;
public class HelloWorldXmlWithDI {
public static void main(String[] args) throws Exception {
// get the bean factory
BeanFactory factory = getBeanFactory();
View mr = (View) factory.getBean("renderer");
mr.render();
}
private static BeanFactory getBeanFactory() throws Exception {
// get the bean factory
BeanFactory factory = new XmlBeanFactory(new FileSystemResource(
"build/beans.xml"));
return factory;
}
}
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