How to write a Simple Spring Program ?

This is one of the simplest program, which uses DI (Dependency Injection) feature of Spring.

For this tutorial you need Spring_2.5.jar and commons-logging-1.1.1.jar file.

I am using NetBeans 7.2 for this tutorial..

Lets Start -

1. Create a class with main function, in my example i am creating class FirstSpringProgram.java containing main class.

FirstSpringProgram.java

/**

 *

 * @author Vikas Kumar Verma

 */

public class FirstSpringProgram {

    /**

     * @param args the command line arguments

     */

    public static void main(String[] args) {

        System.out.println("JSR");

        /**

         * Create and dispense bean, It load Bean Definition and wire bean

         * together.

         */

        ApplicationContext applicationContext

                = new FileSystemXmlApplicationContext(

                        "E:\\vikas\\rnd\\FirstSpringProgram\\Spring.xml");

        /**

         * Get Bean using Bean ID declred in Spring.xml file.

         */

        SpringBean springBean = (SpringBean) applicationContext.getBean("SpringBean");

        /**

         * Executing the bean method.

         */

        System.out.println("Out put from Spring Bean: " + springBean.callSpring());

        System.out.println("Thanks");

    }

} /* End of class */

2. Now we need to create Interface which represent the Spring Bean, Name this file as

SpringBean.java - 

/*

 * Interface declaring prototype of Spring Bean

 */

package firstspringprogram.bean;

/**

 *

 * @author Vikas Kumar Verma

 */

public interface SpringBean {

    /**

     * Bean Method return bean message.

     *

     * @return String

     */

    public String callSpring();

}

/* End of class */

3. Create a Bean class implimenting SpringBean Interface, as SpringBeanImpl.java

SpringBeanImpl.java -

package firstspringprogram.bean;

/**

 * @author : Vikas Kumar Verma

 */

public class SpringBeanImpl implements SpringBean {

    /**

     * Bean Method return bean message.

     *     

* @return String

     */

    @Override

    public String callSpring() {

        /**

         * Return Bean Message

         */

        return "Thank You for Calling Me ... ";

    }

}

/* End of class */

4. Now we have to map the bean with spring container, to do this

you need to create and xml config file which register the bean(interface)

with its implimentation.

Spring.xml - 

<?xml version="1.0" encoding="UTF-8"?>

<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-2.0.xsd">

    <bean id="SpringBean" class="firstspringprogram.bean.SpringBeanImpl">

    </bean>

</beans>

Now you have done with it, just compile the program.

The output should be like this -

Output from Spring Bean:

Thank You for Calling Me …

Thanks