JAVA EE: How to create a concrete Map collection class (HashMap and TreeMap) using mapFactoryBean in Spring

Friday 10 August 2018

How to create a concrete Map collection class (HashMap and TreeMap) using mapFactoryBean in Spring

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How to create a concrete Map collection class (HashMap and TreeMap) using mapFactoryBean in Spring

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>

FruitShop.java

package com.ram.core;

import java.util.Iterator;

import java.util.Map;

import java.util.Map.Entry;

import java.util.Set;

public class FruitShop

{

    private String shopName;

    private Map<Integer, String> mapOfAvailableFruits;

    public String getShopName()

    {

        return shopName;

    }

    public void setShopName(String shopName)

    {

        this.shopName = shopName;

    }

    public Map<Integer, String> getMapOfAvailableFruits()

    {

        return mapOfAvailableFruits;

    }

    public void setMapOfAvailableFruits(

            Map<Integer, String> mapOfAvailableFruits)

    {

        this.mapOfAvailableFruits = mapOfAvailableFruits;

    }

    public void displayFruitShopInfo()

    {

        System.out.println("FruitShop [shopName=" + shopName

                + ", mapOfAvailableFruits=" + mapOfAvailableFruits + "]");

        System.out.println("Fruit ShopName = " + shopName);

        Set<Entry<Integer, String>> set = mapOfAvailableFruits.entrySet();

        Iterator<Entry<Integer, String>> itr = set.iterator();

        while (itr.hasNext())

        {

            Entry<Integer, String> entry = itr.next();

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

                    + ", Fruit Name = " + entry.getValue());

        }

    }

}

applicationContext.xml

<beans xmlns="http://www.springframework.org/schema/beans"

    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 

    xmlns:util="http://www.springframework.org/schema/util"

    xsi:schemaLocation="http://www.springframework.org/schema/beans

    http://www.springframework.org/schema/beans/spring-beans-4.3.xsd

    http://www.springframework.org/schema/util

    http://www.springframework.org/schema/util/spring-util-4.3.xsd">

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

        <property name="shopName" value="Fruit Mart"></property>

        <property name="mapOfAvailableFruits">

            <bean class="org.springframework.beans.factory.config.MapFactoryBean">

                <property name="targetMapClass">

                    <value>java.util.HashMap</value>

                </property>

                <property name="sourceMap">

                    <map>

                        <entry key="1" value="Apple"></entry>

                        <entry key="2" value="Grapes"></entry>

                    </map>

                </property>             

            </bean>

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

        FruitShop fruitShop = (FruitShop) context.getBean("fruitShop");

        System.out.println(

                "Got fruitShop object from the ApplicationContext(Spring Container)");

        fruitShop.displayFruitShopInfo();

    }

}

Output

Jul 31, 2018 9:22:25 AM org.springframework.context.support.AbstractApplicationContext prepareRefresh

INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@5b37e0d2: startup date [Tue Jul 31 09:22:25 IST 2018]; root of context hierarchy

Jul 31, 2018 9:22:25 AM org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions

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

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

Got fruitShop object from the ApplicationContext(Spring Container)

FruitShop [shopName=Fruit Mart, mapOfAvailableFruits={1=Apple, 2=Grapes}]

Fruit ShopName = Fruit Mart

Fruit Id = 1, Fruit Name = Apple

Fruit Id = 2, Fruit Name = Grapes