Aware Injection | Interface Injection

 Directory structure

      








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....