How to use ApplicationContext interface[IoC Container] methods? | Spring Tutorial | Spring Framework

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How to use ApplicationContext interface[IoC Container] methods? | Spring Tutorial | Spring Framework

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>

Employee.java

package com.ram.model;

/**
 * Spring bean
 *
 */
public class Employee
{
    private String name;

    public void setName(String name)
    {
        this.name = name;
    }

    public void employeeDetails()
    {
        System.out.println("Employee Name =  " + name);
    }
}

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="employee" class="com.ram.model.Employee">
        <property name="name" value="Peter" />
    </bean>

</beans>

App.java

package com.ram.core;

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

import com.ram.model.Employee;

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

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

        // 1 st way of getting employee bean
        Object object = context.getBean("employee");
        Employee employee = (Employee) object;
        System.out.println(
                "Got employee object from the ApplicationContext(Spring Container)");
        employee.employeeDetails();

        // 2nd way of getting employee bean
        employee = context.getBean("employee", Employee.class);
        System.out.println(
                "\nGot employee object from the ApplicationContext(Spring Container)");
        employee.employeeDetails();

        // 3rd way of getting employee bean
        employee = context.getBean(Employee.class);
        System.out.println(
                "\nGot employee object from the ApplicationContext(Spring Container)");
        employee.employeeDetails();

        boolean result = context.containsBean("employee");
        System.out.println("\nis employee bean available? = " + result);

        boolean isSingleton = context.isSingleton("employee");
        System.out.println(
                "\nis employee bean Singleton[always return the same instance]? = "
                        + isSingleton);

        boolean isPrototype = context.isPrototype("employee");
        System.out.println(
                "\nis employee bean isPrototype[always return independent instances]? = "
                        + isPrototype);

        String displayName = context.getDisplayName();
        System.out.println("\ndisplayName = " + displayName);

    }

}

Output

Apr 08, 2018 9:20:49 AM org.springframework.context.support.AbstractApplicationContext prepareRefresh
INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@2096442d: startup date [Sun Apr 08 09:20:49 IST 2018]; root of context hierarchy
Apr 08, 2018 9:20:51 AM org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
INFO: Loading XML bean definitions from class path resource [applicationContext.xml]
---------------------------------------
Got employee object from the ApplicationContext(Spring Container)
Employee Name =  Peter

Got employee object from the ApplicationContext(Spring Container)
Employee Name =  Peter

Got employee object from the ApplicationContext(Spring Container)
Employee Name =  Peter

is employee bean available? = true

is employee bean Singleton[always return the same instance]? = true

is employee bean isPrototype[always return independent instances]? = false

displayName = org.springframework.context.support.ClassPathXmlApplicationContext@2096442d

Refer:

https://docs.spring.io/spring-framework/docs/current/javadoc-api/index.html?org/springframework/context/ApplicationContext.html

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

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

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

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