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


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

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

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

Bitbucket Link:
https://bitbucket.org/ramram43210/spring/src/463ef0439e374e3884b06b8ead881ecf3ac4364f/Spring_2018/SpringDemo_MapFactoryBean/?at=master

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