Example program for springs

Example program for dependency injection: with using springs and without using spring

/*  DrawingApp.java */
package org.rajendra.spring;

public class DrawingApp 
{
public static void main(String args[])
{
Triangle triangle=new Triangle();

triangle.draw();
}

}
javac DrawingApp.java

package org.rajendra.spring;

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

javac Triangle .java

java DrawingApp

//with using spring:

• download the spring jar files
• set the class path of spring jar files

like below

package org.rajendra.spring;

import org.springframework.beans.factory.BeanFactory;

import org.springframework.beans.factory.xml.XmlBeanFactory;

import org.springframework.core.io.FileSystemResource;

public class DrawingApp 

{

public static void main(String args[])

{

//Triangle triangle=new Triangle();

//using bean Factory

BeanFactory factory=new XmlBeanFactory(new FileSystemResource("spring.xml"));

Triangle triangle=(Triangle)factory.getBean("triangle");

triangle.draw();

}

}

package org.rajendra.spring;

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

 }
}

• now create a xml file for beans

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN 2.0//EN" "http://www.springframework.org/dtd/spring-beans-2.0.dtd">

<beans>

 <bean id="triangle" class="org.rajendra.spring.Triangle"/>

</beans>

• now execute the program