Friday 25 May 2018

How to Inject List having Dependent Object using Spring dependency injection by constructor?


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How to Inject List having Dependent Object using Spring dependency injection by constructor?

How to Inject List having Dependent Object using Spring dependency injection by constructor?

How to Inject List having Dependent Object using Spring dependency injection by constructor?

How to Inject List having Dependent Object using Spring dependency injection by constructor?

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>

Fruit.java

package com.ram.model;

public class Fruit
{
    private String name;
    private String color;

    public Fruit(String name, String color)
    {
        System.out.println("Fruit(String name, String color) "
                + "constructor is called by the Spring container");
        this.name = name;
        this.color = color;
    }

    @Override
    public String toString()
    {
        return "Fruit [name=" + name + ", color=" + color + "]";
    }

}

FruitShop.java

package com.ram.core;

import java.util.List;

import com.ram.model.Fruit;

public class FruitShop
{
    private String shopName;
    private List<Fruit> listOfAvailableFruits;

    public FruitShop(String shopName, List<Fruit> listOfAvailableFruits)
    {
        System.out.println(
                "FruitShop(String shopName, List<Fruit> listOfAvailableFruits) "
                        + "constructor is called by the Spring container");
        this.shopName = shopName;
        this.listOfAvailableFruits = listOfAvailableFruits;
    }

    public void displayFruitShopInfo()
    {
        System.out.println("FruitShop [shopName=" + shopName
                + ", listOfAvailableFruits=" + listOfAvailableFruits + "]");
    }

}

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="fruit1" class="com.ram.model.Fruit">
        <constructor-arg type="String" value="Apple"></constructor-arg>
        <constructor-arg type="String" value="Red"></constructor-arg>
    </bean>

    <bean id="fruit2" class="com.ram.model.Fruit">
        <constructor-arg type="String" value="Grapes"></constructor-arg>
        <constructor-arg type="String" value="Violet"></constructor-arg>
    </bean>

    <bean id="fruitShop" class="com.ram.core.FruitShop">

        <constructor-arg type="String" value="Fruit Mart"></constructor-arg>
        <constructor-arg type="java.util.List">
            <list>
                <ref bean="fruit1" />
                <ref bean="fruit2" />
            </list>
        </constructor-arg>

    </bean>

</beans>

App.java

package com.ram.core;

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

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

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

        FruitShop fruitShop = (FruitShop) context.getBean("fruitShop");
        System.out.println(
                "Got fruitShop object from the ApplicationContext(Spring Container)");
        fruitShop.displayFruitShopInfo();

    }

}

Output

Apr 26, 2018 9:42:33 AM org.springframework.context.support.AbstractApplicationContext prepareRefresh
INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@5b37e0d2: startup date [Thu Apr 26 09:42:33 IST 2018]; root of context hierarchy
Apr 26, 2018 9:42:34 AM org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
INFO: Loading XML bean definitions from class path resource [applicationContext.xml]
Fruit(String name, String color) constructor is called by the Spring container
Fruit(String name, String color) constructor is called by the Spring container
FruitShop(String shopName, List<Fruit> listOfAvailableFruits) constructor is called by the Spring container
---------------------------------------
Got fruitShop object from the ApplicationContext(Spring Container)
FruitShop [shopName=Fruit Mart, listOfAvailableFruits=[Fruit [name=Apple, color=Red], Fruit [name=Grapes, color=Violet]]]

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

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

Bitbucket Link:
https://bitbucket.org/ramram43210/spring/src/a1d5b66cf948298a0bb7c33e9b2c0967275f5a95/Spring_2018/SpringDemo_DI_List_DependentObject/?at=master

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