Wednesday, 18 July 2018

What is Spring Dependency Injection with static Factory Method?


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What is Spring Dependency Injection with static Factory Method?

What is Spring Dependency Injection with static Factory 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>

Employee.java

package com.ram.model;

/*
 * This class is a singleton class
 */

public class Employee
{
    private String name;
    private int age;

    private static Employee employee = null;

    private Employee()
    {
        name = "Peter";
        age = 42;
    }

    public static Employee getEmployee()
    {
        System.out.println("getEmployee() factory method "
                + "is called by the spring container ");
        if (employee == null)
        {
            employee = new Employee();
        }

        return employee;
    }

    public void displayEmployeeDetails()
    {
        System.out.println("Employee [name=" + name + ", age=" + age + "]");
    }

}

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" factory-method="getEmployee">
    </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("---------------------------------------");

        Employee employee = (Employee) context.getBean("employee");
        System.out.println(
                "Got employee object from the ApplicationContext[Spring Container]");
       
        employee.displayEmployeeDetails();
    }

}

Output

<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="address" class="com.ram.model.Address" >
        <constructor-arg value="Chennai"></constructor-arg>
        <constructor-arg value="Tamil Nadu"></constructor-arg>
        <constructor-arg value="India"></constructor-arg>
    </bean>

    <bean id="employee" class="com.ram.model.Employee" autowire="no">
        <constructor-arg value="Peter"></constructor-arg>
    </bean>

</beans>


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

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

Bitbucket Link:
https://bitbucket.org/ramram43210/spring/src/a2a3948db9c8932cede027a3aaf7ba5a87170ed8/Spring_2018/SpringDemo_DI_StaticfactoryMethod/?at=master

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