Spring — FactoryBean | Code Factory

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• If we implement FactoryBean then we have to implement 3 methods of FactoryBean interface.
  - getObject()
  - getObjectType()
  - isSingleton()

Create Java Project

• Open Eclipse
• Go to File -> New -> Others… -> Java Project
• Create FactoryClasseFactoryBean project
• Right click on project -> Build Path -> Configure Build Path -> Libraries tab -> Add External JARs
  - commons-logging-X.X.jar
  - spring-beans-X.X.X.jar
  - spring-context-X.X.X.jar
  - spring-core-X.X.X.jar
• * You can find dtd information from spring-beans-X.X.X.jar -> org -> springframework -> beans -> factory -> xml -> spring-beans.dtd (line no 36 & 37)

spring.java

<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN 2.0//EN"
	"http://www.springframework.org/dtd/spring-beans-2.0.dtd">
<beans>
	<bean id="cf" class="com.codeFactory.beans.CarFactory" >
		<property name="companyName" value="com.codeFactory.beans.JLR" />
	</bean>
</beans>

Car.java

package com.codeFactory.beans;
/**
 * @author code.factory
 *
 */
public interface Car {
	public void drive();
}

CarFactory.java

package com.codeFactory.beans;
import org.springframework.beans.factory.FactoryBean;
/**
 * @author code.factory
 *
 */
public class CarFactory implements FactoryBean {
	private String companyName;
	public void setCompanyName(String companyName) {
		this.companyName = companyName;
	}
	@Override
	public Object getObject() throws Exception {
		return Class.forName(companyName).newInstance();
	}
	@Override
	public Class getObjectType() {
		return Car.class;
	}
	@Override
	public boolean isSingleton() {
		/* true - for Singleton
		 * false - for Prototype */
		return true;
	}
}

Audi.java

package com.codeFactory.beans;
/**
 * @author code.factory
 *
 */
public class Audi implements Car {
	@Override
	public void drive() {
		System.out.println("Maximum speed is 200");
	}
}

JLR.java

package com.codeFactory.beans;
/**
 * @author code.factory
 *
 */
public class JLR implements Car {
	@Override
	public void drive() {
		System.out.println("Maximum speed is 250");
	}
}

Client.java

package com.codeFactory.test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import com.codeFactory.beans.Car;
/**
 * @author code.factory
 *
 */
public class Client {
	public static void main(String... args) {
		ApplicationContext context = new ClassPathXmlApplicationContext("com/codeFactory/resources/spring.xml");
		
		Car c = (Car) context.getBean("cf");
		c.drive();
	}
}

Output:

Maximum speed is 250