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| What is Spring DI with a non-static factory method that returns the instance of another class? |
 |
| What is Spring DI with a non-static factory method that returns the instance of another class? |
 |
| What is Spring DI with a non-static factory method that returns the instance of another class? |
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%20http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.ram.core</groupId>
<artifactId>SpringDemo</artifactId>
<packaging>jar</packaging>
<version>1.0-SNAPSHOT</version>
<name>SpringDemo</name>
<url>http://maven.apache.org</url>
<properties>
<spring.version>5.0.2.RELEASE</spring.version>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<!-- Spring 5 dependencies -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>${spring.version}</version>
</dependency>
</dependencies>
</project>
Animal.java
package com.ram.model;
public interface Animal
{
public abstract void eat();
}
Cow.java
package com.ram.model;
public class Cow
implements Animal
{
public void eat
()
{
System.
out.
println("Cow eats grass..");
}
}
Dog.java
package com.ram.model;
public class Dog
implements Animal
{
public void eat
()
{
System.
out.
println("Dog eats chicken bone...");
}
}
AnimalFactory.java
package com.ram.factory;
import com.ram.model.Animal;
import com.ram.model.Dog;
public class AnimalFactory
{
public Animal getAnimal()
{
return new Dog();// return any one instance, either Dog or Cow
// return new Cow();
}
}
applicationContext.xml
<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-4.3.xsd">
<bean id="animalFactory" class="com.ram.factory.AnimalFactory"></bean>
<bean id="animal" class="com.ram.factory.AnimalFactory"
factory-method="getAnimal" factory-bean="animalFactory">
</bean>
</beans>
App.java
package com.ram.core;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import com.ram.model.Animal;
public class App
{
public static void main
(String[] args
)
{
ApplicationContext context =
new ClassPathXmlApplicationContext
(
"applicationContext.xml");
System.
out.
println("---------------------------------------");
Animal animal =
(Animal
)context.
getBean("animal");
System.
out.
println(
"Got " + animal +
" object from the ApplicationContext[Spring Container]");
animal.
eat();
}
}
Output
Jul 06, 2018 9:28:28 AM org.springframework.context.support.AbstractApplicationContext prepareRefresh
INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@5b37e0d2: startup date [Fri Jul 06 09:28:28 IST 2018]; root of context hierarchy
Jul 06, 2018 9:28:28 AM org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
INFO: Loading XML bean definitions from class path resource [applicationContext.xml]
---------------------------------------
Got com.ram.model.Dog@3ffc5af1 object from the ApplicationContext[Spring Container]
Dog eats chicken bone...
Click the below link to download the code:
https://sites.google.com/site/ramj2eev2/java_basics/SpringDemo_DI_Non-StaticfactoryMethod_another_class.zip?attredirects=0&d=1
Github Link:
https://github.com/ramram43210/javaee/tree/master/Spring_2018/SpringDemo_DI_Non-StaticfactoryMethod_another_class
Bitbucket Link:
https://bitbucket.org/ramram43210/spring/src/87c44fe2f8e6bec23f023e02860b09f4be9b1bfd/Spring_2018/SpringDemo_DI_Non-StaticfactoryMethod_another_class/?at=master
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