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Configure default initialization and destroy methods in all spring beans


In case, if you have many spring beans with initialization and destory method, then you need to define init-method and destroy-method on each individual spring bean. Spring provides an alternative and flexible way to configure this. You can define only once with same method signature and you can use across all spring beans. You need to configure default-init-method and default-destroy-method attributes on the <beans> element. This example shows how to configure it.

package com.java2novice.beans;

import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

public class NetworkManager{

	private HttpURLConnection connection;
	private String urlStr;
	
	public void setUrlStr(String urlStr){
		this.urlStr = urlStr;
	}
	
	public void init(){
		
		System.out.println("Inside init() method...");
		URL obj;
		try {
			obj = new URL(this.urlStr);
			//initialize http connection here
			this.connection = (HttpURLConnection) obj.openConnection();
		} catch (MalformedURLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	
	public void destroy(){
		try{
			System.out.println("Inside destroy() method...");
			if(this.connection != null) {
				connection.disconnect();
			}
		} catch(Exception ex){
			
		}
	}
	
	public void readData(){
		try {
			int responseCode = this.connection.getResponseCode();
			System.out.println("Response code: "+responseCode);
			/**
			 * do your business logic here
			 */
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
}

Xml based configuration file:

<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-3.0.xsd"
	default-init-method="init"
	default-destroy-method="destroy">

    <bean id="netManager" class="com.java2novice.beans.NetworkManager">
    	<property name="urlStr" value="http://www.google.com/search?q=java2novice"/>    
    </bean>
</beans>

Spring bean demo class:

package com.java2novice.test;

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

import com.java2novice.beans.NetworkManager;

public class SpringDemo {

	public static void main(String a[]){
		String confFile = "applicationContext.xml";
		ConfigurableApplicationContext context 
								= new ClassPathXmlApplicationContext(confFile);
		NetworkManager networkMng = (NetworkManager) context.getBean("netManager");
		networkMng.readData();
		context.close();
	}
}

Output:
Inside init() method...
Response code: 403
Inside destroy() method...
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Knowledge Centre
Difference between super() and this()
super() is used to call super class constructor, whereas this() used to call constructors in the same class, means to call parameterized constructors.
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About Author

I'm Nataraja Gootooru, programmer by profession and passionate about technologies. All examples given here are as simple as possible to help beginners. The source code is compiled and tested in my dev environment.

If you come across any mistakes or bugs, please email me to [email protected] or you can comment on the page.

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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java is registered trademark of Oracle.
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