Java Tutorials Corner: Spring Hello World Program

Spring Hello World Program

In this tutorial we are going to see how to create Spring Hello World program.Step by step procedure to create Spring Program using Eclipse given below.
Follow the Simple steps.
1. Select File –> New –> Java Project from your Eclipse IDE.

2. Name your Project. I Created Project Name called Spring-HelloWorld1

3. Add the following jars into your build path.
commons-logging-1.1.3.jar
spring-beans-3.2.4.RELEASE.jar
spring-context-3.2.4.RELEASE.jar
spring-context-support-3.2.4.RELEASE.jar
spring-core-3.2.4.RELEASE.jar
spring-expression-3.2.4.RELEASE.jar
4. Now create package com.javatutorialscorner.spring under Spring-HelloWorld1 Project
5. Next create HelloWorld class under com.javatutorialscorner.spring package
HelloWorld.java

package com.javatutorialscorner.spring;

public class HelloWorld {
 private String sayHello;

 public void getSayHello() {
  System.out.println("Java Tutorials Corner "+sayHello);
 }

 public void setSayHello(String sayHello) {
  this.sayHello = sayHello;
 }

}

6. Now Create RunApp class which contains Bean configuration path to load configuration from Bean.xml file

RunApp.java

package com.javatutorialscorner.spring;

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

public class RunApp {

 /**
  * @param args
  */
 public static void main(String[] args) {
  // TODO Auto-generated method stub
  
  ApplicationContext context = new ClassPathXmlApplicationContext("Beans.xml");
  HelloWorld helloWorld = (HelloWorld)context.getBean("helloWorld");
  helloWorld.getSayHello();
 }

}

In above program

First step I created Application context using ClassPathXmlApplicationContext which load configuration from bean file which located in class path of application, It take care of creating and initializing all the objects (Beans) declared in bean.xml

Next getBean() method used to get particular bean from created context. This method used bean name as parameter and returns generic object. We can caste to actual object.

Once Object Created you can access any method from that class.

7. Create Bean.xml at where your class files created (ClassPathXmlApplicationContext tries to load bean file from class path).

Bean.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.xsd">
<bean id="helloWorld" class="com.javatutorialscorner.spring.HelloWorld">
<property name="sayHello" value="say Hello"></property>
</bean>

</beans>

Bean.xml is default name given to bean configuration file. You can choose any name for your bean.xml but you can use file name in main application to create context and your file available in your class path must be same.

Bean.xml is used to assign unique ID to different beans and controls the creation object with different values, using above file you can pass any value to variable sayHello without changing the class file.

Now your First Spring Hello World program ready to run.Now you can run the program see the following output in console.