Tuesday 26 June 2018

Spring bean inheritance | Spring bean configuration inheritance | Spring Tutorial | Spring basics


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Spring bean inheritance | Spring bean configuration inheritance | Spring Tutorial | Spring basics

Spring bean inheritance | Spring bean configuration inheritance | Spring Tutorial | Spring basics

Spring bean inheritance | Spring bean configuration inheritance | Spring Tutorial | Spring basics

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>

Person.java

package com.ram.model;

public class Person
{

    private int numberOfLegs;
    private int numberOfHands;
    private int id;
    private String name;

    public Person(int numberOfLegs, int numberOfHands)
    {
        System.out.println("Person(int numberOfLegs, int numberOfHands) "
                + "constructor is called by the Spring container");
        this.numberOfLegs = numberOfLegs;
        this.numberOfHands = numberOfHands;
    }

    public Person(int numberOfLegs, int numberOfHands, int id, String name)
    {
        System.out.println(
                "Person(int numberOfLegs, int numberOfHands, int id, String name) "
                        + "constructor is called by the Spring container");
        this.numberOfLegs = numberOfLegs;
        this.numberOfHands = numberOfHands;
        this.id = id;
        this.name = name;
    }

    public void displayPersonDetails()
    {
        System.out.println("Person [id=" + id + ", name=" + name
                + ", numberOfLegs=" + numberOfLegs + ", numberOfHands="
                + numberOfHands + "]");
    }

}

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="person" class="com.ram.model.Person">
        <constructor-arg type="int" value="2"></constructor-arg>
        <constructor-arg type="int" value="2"></constructor-arg>
    </bean>

    <bean id="personPeter" class="com.ram.model.Person" parent="person">
        <constructor-arg type="int" value="200"></constructor-arg>
        <constructor-arg type="String" value="Peter"></constructor-arg>
    </bean>

</beans>

App.java

package com.ram.core;

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

import com.ram.model.Person;

public class App
{
    public static void main(String[] args)
    {
        ApplicationContext context = new ClassPathXmlApplicationContext(
                "applicationContext.xml");

        System.out.println("---------------------------------------");

        Person person = (Person) context.getBean("person");
        System.out.println(
                "Got person object from the ApplicationContext(Spring Container)");
        person.displayPersonDetails();
     
        System.out.println("---------------------------------------");
     
        Person personPeter = (Person) context.getBean("personPeter");
        System.out.println(
                "Got personPeter object from the ApplicationContext(Spring Container)");
        personPeter.displayPersonDetails();

    }

}

Output

May 08, 2018 10:12:27 AM org.springframework.context.support.AbstractApplicationContext prepareRefresh
INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@5b37e0d2: startup date [Tue May 08 10:12:27 IST 2018]; root of context hierarchy
May 08, 2018 10:12:28 AM org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
INFO: Loading XML bean definitions from class path resource [applicationContext.xml]
Person(int numberOfLegs, int numberOfHands) constructor is called by the Spring container
Person(int numberOfLegs, int numberOfHands, int id, String name) constructor is called by the Spring container
---------------------------------------
Got person object from the ApplicationContext(Spring Container)
Person [id=0, name=null, numberOfLegs=2, numberOfHands=2]
---------------------------------------
Got personPeter object from the ApplicationContext(Spring Container)
Person [id=200, name=Peter, numberOfLegs=2, numberOfHands=2]

Click the below link to download the code:
https://sites.google.com/site/ramj2eev2/java_basics/SpringDemo_Sping_Inheritance.zip?attredirects=0&d=1

Github Link:
https://github.com/ramram43210/javaee/tree/master/Spring_2018/SpringDemo_Sping_Inheritance

Bitbucket Link:
https://bitbucket.org/ramram43210/spring/src/e3083a26f8b5dc28ef01dcb434963fb880058c7b/Spring_2018/SpringDemo_Sping_Inheritance/?at=master

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