Spring examples #1 - beginning with spring

I decided to prepare for Spring certification. Therefore, in the series of 'Spring examples' posts I will introduce and clean up the most important Spring concepts.

The source code for this post is available at:

git clone git@bitbucket.org:marpiech/iseqspringcore.git

Prerequisities:
- eclipse: download 'Eclipse IDE for Java EE Developers' from http://www.eclipse.org/downloads/
- maven: download it from http://maven.apache.org/download.html or by sudo apt-get install maven2 
- m2eclipse: in eclipse Help -> Marketplace -> Maven integration for Eclipse -> install
- SpringSource Tool Suite: in eclipse Help -> Marketplace -> STS -> install

First, we have to create directory structure. bash

mkdir iseqspringcore
cd iseqspringcore
mkdir -p src/{test,main}/{java,resources}

Next, we need to set up maven.

nano pom.xml

and paste:

 4.0.0

 com.intelliseq
 spring-tutorial
 1.0

 Spring Tutorial Part 1

Now, we have to prepare eclipse project. bash

mvn install
mvn eclipse:eclipse

Let's switch to eclipse.
File -> Import -> General -> Existing Projects into workspace
RightClick on Project -> Configure -> Convert to maven project

Add maven repository to pom.xml

 
       central
       Maven Repository Switchboard
       default
       http://repo1.maven.org/maven2
       
         false
       
   

RightClick on Project -> Maven -> Add Dependency -> org.springframework, spring-context
Have a look at pom.xml and in project at Maven Dependencies set of libraries.

In src/main/java create package com.intelliseq.springexamples.core Create application-context.xml in the com.intelliseq.springexamples package. There are two two types of bean instantiation through setters: classic one and modern one (see below).

Let's create Person class in the com.intelliseq.springexamples.core package.

package com.intelliseq.springexamples.core;

public class Person {
 
 private String firstName;
 private String familyName;
 
 public void setFirstName(String firstName) {
  this.firstName = firstName;
 }

 public void setFamilyName(String familyName) {
  this.familyName = familyName;
 }

 @Override
 public String toString() {
  return firstName + " " + familyName;
 }
}

And finally let's create application runner class SpringApp in the com.intelliseq.springexamples.core package. The SpringApp class uses application-context through ClassPathXmlApplicationContext class.

package com.intelliseq.springexamples.core;

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

public class SpringApp {

 public static void main (String[] args) {
  ApplicationContext context =
       new ClassPathXmlApplicationContext(new String[] {"com/intelliseq/springexamples/application-context.xml"});
  Person person = (Person) context.getBean("person");
  System.out.println(person);
  Person modernPerson = (Person) context.getBean("person-modern");
  System.out.println(modernPerson);
 }
 
}

Run Spring App and voila.