Example program for Injecting Objects

Example program: steps: (Error in this program)
1. import the jar files (set the class path)
2. xml file
3. java files

//DrawingApp .java

package org.rajendra.spring;

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

import org.springframework.context.ApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;

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"));

ApplicationContext context=new ClassPathXmlApplicationContext("spring.xml");

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

triangle.draw();

}

}

/*Point.java*/

package org.rajendra.spring;

public class Point
{
private int x;
private int y;
public int getX()
{
return x;
}
public void setX(int x)
{
this.x = x;
}
public int getY()
{
return y;
}
public void setY(int y)
{
this.y = y;
}


}

//Triangle.java

package org.rajendra.spring;

public class Triangle 

{

private Point pointA;

private Point pointB;

private Point pointC;

//use spring dependency injection to pre populate

 public Point getPointA() {

return pointA;

}

public void setPointA(Point pointA) {

this.pointA = pointA;

}

public Point getPointB() {

return pointB;

}

public void setPointB(Point pointB) {

this.pointB = pointB;

}

public Point getPointC() {

return pointC;

}

public void setPointC(Point pointC) {

this.pointC = pointC;

}

public void draw()

 {

System.out.println("Point A=("+getPointA().getX()+","+getPointA().getY()+")");

System.out.println("Point B=("+getPointB().getX()+","+getPointB().getY()+")" );

System.out.println("Point c=("+getPointC().getX()+","+getPointC().getY()+")");

 

 }

}

//spring.xml file

<?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">

 <property name="pointA" ref="zeroPoint"/>

 <property name="pointB" ref="point2"/>

 <property name="pointC" ref="point3"/>

 </bean>

         

<bean id="zeroPoint" class="org.rajendra.Point">

 <property name="x" value="0"/>

 <property name="y" value="0"/>

</bean>

<bean id="point2" class="org.rajendra.Point">

 <property name="x" value="-20"/>

 <property name="y" value="0"/>

</bean>

<bean id="point3" class="org.rajendra.Point">

 <property name="x" value="20"/>

 <property name="y" value="0"/>

</bean>

</beans>