Spring BeanFactory Container Example

In this post, we will look into Spring BeanFactory Container with an Example

The Spring IOC container

Spring IOC container is mainly responsible for instantiating, configuring, and assembling the Spring beans. The Spring container gets instructions on what are objects to instantiate, configure, and assemble by reading configurational metadata. The configurational metadata is represented in XML config file or Java annotations

Spring framework provides the following two types of containers.

BeanFactory container
ApplicationContext container

In this post, we post let’s have a look into Spring BeanFactory container using a demo Project.

Spring BeanFactory Container

This is the simplest container that provides the basic support for DI and defined by the org.springframework.beans.factory.BeanFactory interface.
XmlBeanFactory is the implementation class of BeanFactory

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.kkhindigyan.org</groupId>
	<artifactId>SpringBeanFactoryContainer</artifactId>
	<version>0.0.1-SNAPSHOT</version>

	<properties>
		<org.springframework.version>5.2.13.RELEASE</org.springframework.version>
	</properties>

	<dependencies>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-context</artifactId>
			<version>${org.springframework.version}</version>
		</dependency>
	</dependencies>
</project>

<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">

<groupId>com.kkhindigyan.org</groupId>

<artifactId>SpringBeanFactoryContainer</artifactId>

<version>0.0.1-SNAPSHOT</version>

<org.springframework.version>5.2.13.RELEASE</org.springframework.version>

</properties>

<groupId>org.springframework</groupId>

<artifactId>spring-context</artifactId>

<version>${org.springframework.version}</version>

</dependency>

</dependencies>

</project>

Message.java

package com.kkhindigyan.model;

public class Message {
	
	private Integer messageId;
	private String message;
	
	public Integer getMessageId() {
		return messageId;
	}
	public void setMessageId(Integer messageId) {
		this.messageId = messageId;
	}
	public String getMessage() {
		return message;
	}
	public void setMessage(String message) {
		this.message = message;
	}
}

package com.kkhindigyan.model;

public class Message {

private Integer messageId;

private String message;

public Integer getMessageId() {

return messageId;

}

public void setMessageId(Integer messageId) {

this.messageId = messageId;

}

public String getMessage() {

return message;

}

public void setMessage(String message) {

this.message = message;

}

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"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
        https://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        https://www.springframework.org/schema/context/spring-context.xsd">
        
	<bean id="message" class="com.kkhindigyan.model.Message">
		<property name="messageId" value="101"></property>
		<property name="message" value="Welcome to Spring Framework!!"></property>
	</bean>
</beans>

<?xml version="1.0" encoding="UTF-8"?>

<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

https://www.springframework.org/schema/beans/spring-beans.xsd

http://www.springframework.org/schema/context

https://www.springframework.org/schema/context/spring-context.xsd">

</bean>

</beans>

ClientTest.java

package com.kkhindigyan.org;

import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.xml.XmlBeanFactory;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.Resource;

import com.kkhindigyan.model.Message;

public class ClientTest {

	public static void main(String[] args) {
		
		BeanFactory beanFactory = null;
		
		try {
			
			//Creating Instance of BeanFactory Spring Container
			Resource resource = new ClassPathResource("ApplicationContext.xml");
			beanFactory = new XmlBeanFactory(resource);
			
			//Asking Spring Container to return Spring bean with id "message"
			Object object = beanFactory.getBean("message");
			//Covert Spring bean into your business Object
			Message message = (Message)object;
			
			//Print Spring bean state
			System.out.println(message.getMessageId()+"\t"+message.getMessage());
			
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}

package com.kkhindigyan.org;

import org.springframework.beans.factory.BeanFactory;

import org.springframework.beans.factory.xml.XmlBeanFactory;

import org.springframework.core.io.ClassPathResource;

import org.springframework.core.io.Resource;

import com.kkhindigyan.model.Message;

public class ClientTest {

public static void main(String[] args) {

BeanFactory beanFactory = null;

try {

//Creating Instance of BeanFactory Spring Container

Resource resource = new ClassPathResource("ApplicationContext.xml");

beanFactory = new XmlBeanFactory(resource);

//Asking Spring Container to return Spring bean with id "message"

Object object = beanFactory.getBean("message");

//Covert Spring bean into your business Object

Message message = (Message)object;

//Print Spring bean state

System.out.println(message.getMessageId()+"\t"+message.getMessage());

} catch (Exception e) {

e.printStackTrace();

}

If you run ClientTest.java as Java Application then it will give the below output:

101 Welcome to Spring Framework!!

That’s all about Spring BeanFactory Container Example

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