Spring Bean init-method and destroy-method with Annotations

In This Tutorial We will Learn Spring bean int-method ad destroy-method with annotations. We can do this by usind @PostConstruct and @PreDestroy

Let's See an Example

Tools Used In This Article

• Spring 4.3.2
• Maven 4.0.0
• JDK 1.7

Project Directory Structure

Maven Dependencies

Add The Following Dependencies to the pom.xml

• spring-core
• spring-beans
• spring-context

1.pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 <modelVersion>4.0.0</modelVersion>
 <groupId>com.practice</groupId>
 <artifactId>postconstructpredestroy</artifactId>
 <version>0.0.1-SNAPSHOT</version>
 <packaging>war</packaging>
 <dependencies>

  <dependency>
   <groupId>org.springframework</groupId>
   <artifactId>spring-core</artifactId>
   <version>4.3.2.RELEASE</version>
  </dependency>

  <dependency>
   <groupId>org.springframework</groupId>
   <artifactId>spring-beans</artifactId>
   <version>4.3.2.RELEASE</version>
  </dependency>

  <dependency>
   <groupId>org.springframework</groupId>
   <artifactId>spring-context</artifactId>
   <version>4.3.2.RELEASE</version>
  </dependency>


 </dependencies>
</project>

2.Writing Spring Beans

In This Example Im Writing one Spring Bean Named With Demo

Demo.java

package com.practice;
import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;

public class Demo {
 private String message;

 public String getMessage() {
  return message;
 }

 public void setMessage(String message) {
  this.message = message;
 }
 @PostConstruct
 public void init()throws Exception{
  System.out.println("Init method :"+message);
 }
 
 @Override
 public String toString() {
  return "Demo [message=" + message + "]";
 }
 
    @PreDestroy
 public void cleanUp()throws Exception{
  
  System.out.println("destroy method ");
  
 }

}

2.Setting Up Spring Configuration File

applicationContext.xml

  <beans xmlns = "http://www.springframework.org/schema/beans"
  xmlns:xsi ="http://www.w3.org/2001/XMLSchema-instance" 
  xmlns:context = "http://www.springframework.org/schema/context"
  xsi:schemaLocation = "http://www.springframework.org/schema/beans
  http://www.springframework.org/schema/beans/spring-beans-4.3.xsd
  http://www.springframework.org/schema/context
  http://www.springframework.org/schema/context/spring-context-4.3.xsd">
  <context:annotation-config/>
  
  <bean id = "demoBean" class = "com.practice.Demo" >
  <property name = "message"  value = "welcome to javalschool"></property>
    </bean>
  </beans>

3.Now Create Test class ,RunThe Code

AppTest.java

package com.practice.test;

import org.springframework.context.ApplicationContext;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.context.support.AbstractApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.practice.Demo;

public class AppTest {

 
 public static void main(String[] args) {
  ConfigurableApplicationContext context = 
       new ClassPathXmlApplicationContext(new String[] {"applicationContext.xml"});
  Demo account  = (Demo)context.getBean("demoBean");
  
  System.out.println(account.toString());
  context.close();
  


 }

}

output:

INFO: Loading XML bean definitions from class path resource [applicationContext.xml]
Init method :welcome to javalschool
Demo [message=welcome to javalschool]
Sep 03, 2016 12:00:50 AM org.springframework.context.support.ClassPathXmlApplicationContext doClose
INFO: Closing org.springframework.context.support.ClassPathXmlApplicationContext@1be87a0: startup date [Sat Sep 03 00:00:49 IST 2016]; root of context hierarchy
destroy method