Program to demonstrate how to use init-method and destroy-method attributes in Spring Configuration file
Step 1 - Create a POJO class here its Employee.java having getters, setters, constructor, init method , destroy method
Step 2 - Create a Spring Configuration file having beans and init-method and destroy-method attributes.
Step 3 - Create a test class here its Test.java having AbstractApplicationContext class for providing registerShutdownHook method to execute destroy method.
Output of the program :
Step 1 - Create a POJO class here its Employee.java having getters, setters, constructor, init method , destroy method
package com.hubberspot.spring.InitDestroy; public class Employee { private String name; private int age; public Employee() { } public String getName() { return name; } public void setName(String name) { this.name = name; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } public void initialize() { System.out.println("Initializing the Employee bean ..."); } public void destroy() { System.out.println("Destroying the Employee bean ..."); } }
Step 2 - Create a Spring Configuration file having beans and init-method and destroy-method attributes.
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Step 3 - Create a test class here its Test.java having AbstractApplicationContext class for providing registerShutdownHook method to execute destroy method.
package com.hubberspot.spring.InitDestroy; import org.springframework.context.support.AbstractApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; public class Test { public static void main(String[] args) { // ApplicationContext is a Spring interface which // provides with the configuration for an application. // It provides us with all the methods that BeanFactory // provides. It loads the file resources in a older // and generic manner. It helps us to publish events to the // listener registered to it. It also provides quick support // for internationalization. It provides us with the object // requested, it reads the configuration file and provides // us with the necessary object required. // We are using concrete implementation of ApplicationContext // here called as ClassPathXmlApplicationContext because this // bean factory reads the xml file placed in the classpath of // our application. We provide ClassPathXmlApplicationContext // with a configuration file called as spring.xml placed // at classpath of our application. AbstractApplicationContext context = new ClassPathXmlApplicationContext(("spring.xml")); // Using AbstractApplicationContext registerShutdownHook() // method to demonstrate destroy() method being called context.registerShutdownHook(); // In order to get a object instantiated for a particular bean // we call getBean() method of ClassPathXmlApplicationContext // passing it the id for which the object is to be needed. // Here getBean() returns an Object. We need to cast it back // to the Employee object. Without implementing new keyword we // have injected object of Employee just by reading an xml // configuration file. Employee employee = (Employee)context.getBean("employee"); System.out.println("The name of Employee is : " + employee.getName()); System.out.println("The age of Employee is : " + employee.getAge()); } }
Output of the program :