Spring 3 hello world example

This tutorial shows you how to create a simple hello world example in Spring 3.0.
Technologies used in this article :

• Spring 3.0.5.RELEASE
• Maven 3.0.3
• Eclipse 3.6
• JDK 1.6.0.13

P.S Spring 3.0, at least JDK 1.5 is required to work.

*Spring 3.0 dependencies
*In Spring 2.5.x, almost the entire Spring modules are grouped into a single spring.jar file. Since Spring 3.0, every modules are split into an individual jar file, for example, spring-core, spring-expression, spring-context, spring-aop and etc.

1. Generate project structure with Maven

Issue below Maven command to create a standard Java project structure.

mvn archetype:generate -DgroupId=com.mkyong.core -DartifactId=Spring3Example    -DarchetypeArtifactId=maven-archetype-quickstart -DinteractiveMode=false

2. Convert to Eclipse project

Convert Maven style project to Eclipse’s style project, and import into Eclipse IDE.

mvn eclipse:eclipse

3. Add Spring 3.0 dependency

Add the Spring 3.0 dependencies listed below in Maven’s pom.xml file. The Spring dependencies are available for download via Maven central repository.
File : pom.xml

  
    4.0.0  
    com.mkyong.core  
    Spring3Example 
    jar  
    1.0-SNAPSHOT 
    Spring3Example 
    http://maven.apache.org  
            
        3.0.5.RELEASE  
       
          
              
                    
            org.springframework          
            spring-core            
           ${spring.version}     
               
                    
           org.springframework           
           spring-context          
           ${spring.version}     
       
    

3. Spring bean

A simple Spring bean.

package com.mkyong.core;

/** * Spring bean * */
public class HelloWorld {   
    private String name;    
    public void setName(String name) {      
        this.name = name;   
    }   
    public void printHello() {      
        System.out.println("Spring 3 : Hello ! " + name);   
    }
}

4. Spring bean configuration file

Create a Spring configuration file, and declare all the available Spring beans.
File : SpringBeans.xml

5. Review project structure

Review directory structure as follows

Spring3-hello-world-example

6. Run It

Run it.

package com.mkyong.core;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class App {  
    public static void main(String[] args) {        
        ApplicationContext context = new ClassPathXmlApplicationContext("SpringBeans.xml");      
        HelloWorld obj = (HelloWorld) context.getBean("helloBean");     
        obj.printHello();   
    }
}

7. Output

Spring 3 : Hello ! Mkyong