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

2. 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

<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 http://maven.apache.org/maven-v4_0_0.xsd"> <modelVersion>4.0.0</modelVersion>
<groupId>com.mkyong.core</groupId>
<artifactId>Spring3Example</artifactId>
<packaging>jar</packaging>
<version>1.0-SNAPSHOT</version>
<name>Spring3Example</name>
<url>http://maven.apache.org</url>

<properties>
<spring.version>3.0.5.RELEASE</spring.version>
</properties>

<dependencies>

<!-- Spring 3 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>

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

<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-3.0.xsd"> 
<bean id="helloBean" class="com.mkyong.core.HelloWorld">
<property name="name" value="Mkyong" />
</bean>

</beans>

5. Review project structure

Review directory structure as follows

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

“`