Dinesh on Java

Triangle.java

package com.sdnext.dineshonjava.beanfactory.tutorial;

public class Triangle 
{
 public void draw()
 {
     System.out.println("Drawing Triangle");
 }
}

spring.xml

<beans xmlns:aop="http://www.springframework.org/schema/aop" xmlns:p="http://www.springframework.org/schema/p" xmlns:>
Drawing.java
package com.sdnext.dineshonjava.beanfactory.tutorial;

import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.xml.XmlBeanFactory;
import org.springframework.core.io.FileSystemResource;

/**
 * @author Dinesh Rajput
 *
 */
public class DrawingApp 
{
 /**
  * @param args
  */
 public static void main(String[] args) 
 {
  //Triangle triangle = new Triangle();
      BeanFactory factory = new XmlBeanFactory(new FileSystemResource("spring.xml"));
  Triangle triangle = (Triangle) factory.getBean("triangle");
  triangle.draw();
 }
}
 
There are following two important points to note about the main program:

First step is to create factory object where we used framework API XmlBeanFactory() to create the factory bean and ClassPathResource() API to load the bean configuration file available in CLASSPATH. The XmlBeanFactory() API takes care of creating and initializing all the objects ie. beans mentioned in the configuration file.
Second step is used to get required bean using getBean() method of the created bean factory object. This method uses bean ID to return a generic object which finally can be casted to actual object. Once you have object, you can use this object to call any class method.

After run the Drawing class we will get following Output on console.

Output:
Jun 17, 2012 3:47:36 PM org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
INFO: Loading XML bean definitions from file [F:my workspacespring03BeanFactoryDemospring.xml]
Drawing Triangle