Java Spring sample application

Spring tutorial example

The Spring Framework consists of features organized into about 20 modules. These modules are grouped into Core Container, Data Access/Integration, Web, AOP (Aspect Oriented Programming),Instrumentation, and Test.

-The Core Container consists of the Core, Beans, Context, and Expression Language modules.

-The Data Access/Integration layer consists of the JDBC, ORM, OXM, JMS and Transaction modules.

-The Web layer consists of the Web, Web-Servlet, Web-Struts, and Web-Portlet modules.

-Spring's AOP module provides an AOP Alliance-compliant aspect-oriented programming.

-The Test module supports the testing of Spring components with JUnit or TestNG.

A simple example in spring (3.x)

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Create a 'test' package which has two java classes.

Hello.java and HelloTest.java

Required jar files:

commons-logging.jar

org.springframework.beans-3.0.0.M4.jar

org.springframework.core-3.0.0.M4.jar

The directory structure as follows:

Hello.java

package test;

public class Hello {
  public void sayHello()
 {
 System.out.println("Hello S L N V Praveen...!!!");
 }
}

HelloTest.java 

package test;

import org.springframework.beans.factory.xml.XmlBeanFactory;
import org.springframework.core.io.ClassPathResource;

public class HelloTest {
 public static void main(String[] args) {
 XmlBeanFactory xb = new XmlBeanFactory(new ClassPathResource("spring.xml"));
 Hello hl = (Hello)xb.getBean("springHello");
 hl.sayHello();
 }
}

Now define a spring config. file that will instantiate the Hello bean object and we'll get the instance using getBean() method of AbstractBeanFactory, which returns an object of type Object. 
-Object getBean(String name) 
-XmlBeanFactory - Create a new XmlBeanFactory with the given resource, which must be parsable using DOM.

Now define the 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" 
xmlns:aop="http://www.springframework.org/schema/aop" 
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">
<bean id="springHello" class="test.Hello"/>
</beans> 

Now run the HelloTest.java....
Happy coding!