JAVA EE: How to Inject Map having Dependent Object in key and value using DI by Setter method

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How to Inject Map having Dependent Object in key and value using DI by Setter method

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 String getName()

    {

        return name;

    }

    public void setName(String name)

    {

        this.name = name;

    }

    public String getColor()

    {

        return color;

    }

    public void setColor(String color)

    {

        this.color = color;

    }

    @Override

    public String toString()

    {

        return "Fruit [name=" + name + ", color=" + color + "]";

    }

}

FruitSeller.java

package com.ram.model;

public class FruitSeller

{

    private String name;

    private String emailId;

    public String getName()

    {

        return name;

    }

    public void setName(String name)

    {

        this.name = name;

    }

    public String getEmailId()

    {

        return emailId;

    }

    public void setEmailId(String emailId)

    {

        this.emailId = emailId;

    }

    @Override

    public String toString()

    {

        return "FruitSeller [name=" + name + ", emailId=" + emailId + "]";

    }

}

FruitInfo.java

package com.ram.core;

import java.util.Iterator;

import java.util.Map;

import java.util.Map.Entry;

import java.util.Set;

import com.ram.model.Fruit;

import com.ram.model.FruitSeller;

public class FruitInfo

{

    private Map<FruitSeller, Fruit> mapOfFruitSellerAndFruit;

    public Map<FruitSeller, Fruit> getMapOfFruitSellerAndFruit()

    {

        return mapOfFruitSellerAndFruit;

    }

    public void setMapOfFruitSellerAndFruit(

            Map<FruitSeller, Fruit> mapOfFruitSellerAndFruit)

    {

        this.mapOfFruitSellerAndFruit = mapOfFruitSellerAndFruit;

    }

    public void displayFruitInfo()

    {

        System.out.println("FruitInfo [mapOfFruitSellerAndFruit="

                + mapOfFruitSellerAndFruit + "]");

        Set<Entry<FruitSeller, Fruit>> set = mapOfFruitSellerAndFruit

                .entrySet();

        Iterator<Entry<FruitSeller, Fruit>> itr = set.iterator();

        while (itr.hasNext())

        {

            Entry<FruitSeller, Fruit> entry = itr.next();

            System.out.println("FruitSeller = " + entry.getKey() + ", Fruit = "

                    + entry.getValue());

        }

    }

}

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="fruitSeller1" class="com.ram.model.FruitSeller">

        <property name="name" value="Peter"></property>

        <property name="emailId" value="Peter@yahoo.com"></property>

    </bean>

    <bean id="fruitSeller2" class="com.ram.model.FruitSeller">

        <property name="name" value="John"></property>

        <property name="emailId" value="John@gmail.com"></property>

    </bean>

    <bean id="fruit1" class="com.ram.model.Fruit">

        <property name="name" value="Apple"></property>

        <property name="color" value="Red"></property>

    </bean>

    <bean id="fruit2" class="com.ram.model.Fruit">

        <property name="name" value="Grapes"></property>

        <property name="color" value="Violet"></property>

    </bean>

    <bean id="fruitInfo" class="com.ram.core.FruitInfo">

        <property name="mapOfFruitSellerAndFruit">

            <map>

                <entry key-ref="fruitSeller1" value-ref="fruit1"></entry>

                <entry key-ref="fruitSeller2" value-ref="fruit2"></entry>

            </map>

        </property>

    </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("---------------------------------------");

        FruitInfo fruitInfo = (FruitInfo) context.getBean("fruitInfo");

        System.out.println(

                "Got fruitInfo object from the ApplicationContext(Spring container)");

        fruitInfo.displayFruitInfo();

    }

}

Output

May 17, 2018 8:47:52 AM org.springframework.context.support.AbstractApplicationContext prepareRefresh

INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@5b37e0d2: startup date [Thu May 17 08:47:52 IST 2018]; root of context hierarchy

May 17, 2018 8:47:52 AM org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions

INFO: Loading XML bean definitions from class path resource [applicationContext.xml]

---------------------------------------

Got fruitInfo object from the ApplicationContext(Spring container)

FruitInfo [mapOfFruitSellerAndFruit={FruitSeller [name=Peter, emailId=Peter@yahoo.com]=Fruit [name=Apple, color=Red], FruitSeller [name=John, emailId=John@gmail.com]=Fruit [name=Grapes, color=Violet]}]

FruitSeller = FruitSeller [name=Peter, emailId=Peter@yahoo.com], Fruit = Fruit [name=Apple, color=Red]

FruitSeller = FruitSeller [name=John, emailId=John@gmail.com], Fruit = Fruit [name=Grapes, color=Violet]