We will see howe we can use interface to implement the lifecycle events of the bean. You can have two intrfaces. One is InitializingBean and has a method afterPropertiesSet. Other interface is DisposableBean which has the destroy . This method will be fired by Spring when you do not have rerefence to the bean and redy for garbage collection
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package com.kayak; import org.springframework.beans.factory.DisposableBean; import org.springframework.beans.factory.InitializingBean; public class Car implements InitializingBean,DisposableBean { Engine engine; private String name; public Car(String name) { this.name= name; System.out.println("Constructor method called"); } public String getName() { return name; } @Override public void afterPropertiesSet() throws Exception { System.out.println("afterPropertiesSet method called"); } @Override public void destroy() throws Exception { System.out.println("Object Disposed"); } } |
You can write the followong main() to test this code
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public static void main(String[] args) { ApplicationContext ctx = new ClassPathXmlApplicationContext("bean.xml"); Car car=(Car)ctx.getBean("car"); } |
Output :
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run: Feb 16, 2018 1:31:11 PM org.springframework.context.support.ClassPathXmlApplicationContext prepareRefresh INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@3d646c37: startup date [Fri Feb 16 13:31:11 IST 2018]; root of context hierarchy Feb 16, 2018 1:31:11 PM org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions INFO: Loading XML bean definitions from class path resource [bean.xml] Constructor method called afterPropertiesSet method called BUILD SUCCESSFUL (total time: 1 second) |