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UNIVERSITY SCIENCE PRESS

SPRING FRAMEWORK WITH JAVA—A PRACTICAL APPROACH

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Bran

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(ix)

1

C H A P T E R

SPRING CORE CONCEPTS

1

The Spring Framework (simply Spring) is a layered open-source application framework

for Java platform; simplifying Java Enterprise Edition application development by its

excellent features such as Inversion-of-Control (IoC), Aspect Oriented Programming, and

Transaction Management.

1.1 SETTING UP THE ENVIRONMENT

You can download the latest version of Spring Framework from Spring Source

Community webpage (http://www.springsource.org/download). The Spring Framework

version 3.2.1 (spring-framework-3.2.1.RELEASE-dist.zip) is used in the demonstration code

of this book. And Eclipse IDE (version Juno) with Windows platform is used for code

development. You can download the latest Eclipse IDE from its official download page

(http://www.eclipse.org/downloads).

Create a new Java Project named “SpringDemo” in Eclipse IDE. Choose File →New → Other → Java Project → Type “SpringDemo” as Project Name → Acceptthe defaults → Finish.

Create a new directory named “lib” under “SpringDemo”. Select “SpringDemo” →Right Click → New → Folder → Type “lib” as Folder name → Finish.

Include Spring library jar files in CLASSPATH. Copy all the Spring library jars

(from spring-framework-3.2.1.RELEASE\libs) to this “lib” directory. Select the project-

name “SpringDemo” → Right click → Properties → Java Build Path (left side) →Libraries Tab → Add JARs → Select All Jar files under the lib directory of ourproject and press OK → OK. Follow the same procedure to include dependent libraryfiles according to your application’s need into CLASSPATH.

Create a Package named “com.springdemo”. Select “src” directory of the project →Right Click → New → Package → Type “com.springdemo” as package name →Finish.

Now the IDE is ready and test Spring applications.

2 Spring Framework with Java—A Practical Approach

1.2 FIRST APPLICATION: DISPLAYING YOUR NAME

Store the following program under “com.springdemo” package.

//File Name: Employee.javapackage com.springdemo;

public class Employee { private String name;

public void setName(String name) { this.name = name; }

public String getName() { return name; }}

Store the following program under “com.springdemo” package.

//File Name: EmployeeApp.javapackage com.springdemo;import org.springframework.context.ApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;

public class EmployeeApp {

public static void main(String args[]) { ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml"); Employee employee = (Employee) context.getBean("employee"); System.out.println("My name is" + employee.getName()); }}

Store the following “beans.xml” file in “src” directory of the project.

Spring Core Concepts 3

Run the EmployeeApp as Java Application. Select “EmployeeApp.java” → RightClick → Run As → Java Application.

The output is shown below.

My name is Mohamed Ibrahim

1.3 INVERSE OF CONTROL (IoC), DEPENDENCY INJECTION

The Inverse of Control (IoC), also known as Dependency Injection (DI) is a technique

where objects define their dependencies. An object defines at runtime what the objects

that it will work with them are. The Spring container injects those dependencies (objects)

when it creates an object (bean).

The following example demonstrates how to apply IoC.

// File Name: DisplayRecord.java

package com.springdemo;

public interface DisplayRecord {

public void display();

}

// File Name: Student.java

package com.springdemo;

public class Student implements DisplayRecord {

@Override

public void display() {

System.out.println("STUDENT RECORD");

System.out.println("Roll Number : 1001");

System.out.println("Name : Mohamed Ibrahim");

System.out.println("Result : Pass]");

}

}

// File Name: Employee.java

package com.springdemo;

public class Employee implements DisplayRecord {

@Override

4 Spring Framework with Java—A Practical Approach

public void display() {

System.out.println("EMPLOYEE RECORD");

System.out.println("Employee Number : 1001");

System.out.println("Employee Name : Mohamed Ibrahim");

System.out.println("Salary : 10,000.00");

}

}

// File Name: AccessRecord.java

package com.springdemo;

public class AccessRecord {

DisplayRecord displayRecord;

public void setDisplayRecord(DisplayRecord displayRecord) {

this.displayRecord = displayRecord;

}

public void outputDetails() {

displayRecord.display();

}

}

// File Name: IoCDemo.java

package com.springdemo;

import org.springframework.context.ApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;

public class IoCDemo {

public static void main(String args[]) {

ApplicationContext context =

new ClassPathXmlApplicationContext("beans.xml");

AccessRecord accessRecord =

(AccessRecord) context.getBean("accessRecord");

accessRecord.outputDetails();

}

}

Spring Framework With Java-APractical Approach

Publisher : Laxmi Publications ISBN : 9789384872618Author : B. MohamedIbrahim

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Spring Framework With Java-A Practical Approach