Aware Injection

Project Structure :- (Three packages)

com.nt.beans

=> Engine.java

=> Vehicle.java

com.nt. cfgs

=> applicationContext.xml

com.nt.client

=> ClientTest.java

Engine.java

package com.nt.beans; public class Engine

{ public Engine() { System.out.println("Engine ::0-param constructor"); } public void start() { System.out.println("Engine started...."); } public void stop() { System.out.println("Engine stopped...."); }

}

 Vehicle.java

package com.nt.beans;

import org.springframework.beans.BeansException;

import org.springframework.context.ApplicationContext;

import org.springframework.context.ApplicationContextAware;

public class Vehicle implements ApplicationContextAware

{

private ApplicationContext ctx=null;

public Vehicle() 

{

System.out.println("Vehicle ::0-param constructor");

}

public void setApplicationContext(ApplicationContext ctx) throws BeansException 

{

System.out.println("Vehicle.setApplicationContext()");

this.ctx=ctx;

}

public void journey(String source, String destination) 

{

Engine engine=null;

System.out.println("Vehicle.journey(-,-)");

engine=ctx.getBean("engg",Engine.class);

engine.start();

System.out.println("Journey is going on from "+source+" to "+destination);

engine.stop();

}

}

applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.3.xsd">

<bean id="engg" class="com.nt.beans.Engine"/>
<bean id="vehicle" class="com.nt.beans.Vehicle"/>


</beans>


 ClientTest.java

package com.nt.client; import org.springframework.context.ApplicationContext; import org.springframework.context.support.AbstractApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; import com.nt.beans.Vehicle; public class ClientTest { public static void main(String[] args) { ApplicationContext ctx=null; ctx=new ClassPathXmlApplicationContext("com/nt/cfgs/applicationContext.xml"); Vehicle v= ctx.getBean("vehicle",Vehicle.class); v.journey("Hyderabad", "Banglore"); ((AbstractApplicationContext) ctx).close(); } }

 Output :- 

Engine ::0-param constructor Vehicle ::0-param constructor Vehicle.setApplicationContext() Vehicle.journey(-,-) Engine started.... Journey is going on from Hyderabad to Banglore Engine stopped....