Creating a Simple Spring Application

Creating a simple Spring application helps developers understand how the Spring Framework simplifies Java development by managing dependencies and application flow. It provides a lightweight and flexible way to build scalable, maintainable applications.

• Uses Dependency Injection (DI) to reduce tight coupling between components
• Supports easy configuration through annotations or XML
• Simplifies development of enterprise-level Java applications

Prerequisites:

• Install Java Development Kit (JDK).
• Download and install IntelliJ.

Step-by-Step Implementation

Follow these steps to build and run a simple application using the Spring Framework efficiently.

Step 1: Create a Maven project

Let’s start by creating a simple Maven-based Spring project following step by step.

• Open IntelliJ IDEA.
• Navigate to the File tab-> Click new-> Project.
• Choose Maven as a project type.
• Click Next and select Quick Start Archetype.
• Fill in the details like-> GroupId: com.Vishnu, ArtifactId: SpringApplication.
• Choose a location for the project and click Finish.

Step 2: Project Structure

After creating the project successfully and adding the necessary dependencies to your Spring application. The project structure will looks something like this.

Step 3: Add the Dependency to pom.xml File

Follow these steps below to add dependencies to pom.xml:

• Open the pom.xml file.
• Visit the Maven repository site to add necessary dependencies.
• Add dependencies inside pom.xml.
• And right click reload maven dependencies.

pom.xml:

<project xmlns="https://maven.apache.org/POM/4.0.0" 
         xmlns:xsi="https://www.w3.org/2001/XMLSchema-instance" 
         xsi:schemaLocation="https://maven.apache.org/POM/4.0.0 
         https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.example</groupId>
    <artifactId>spring-demo</artifactId>
    <version>1.0-SNAPSHOT</version>
    <dependencies>
    <!-- Spring Core -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-core</artifactId>
        <version>5.3.29</version>
    </dependency>

    <!-- Spring Context -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
        <version>5.3.29</version>
    </dependency>
</dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.11.0</version>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

Step 4: Open the Main class and Run

Open the main class that contains the main method and run your Spring application. If everything is set up correctly, then your spring application will run successfully, and you will see the desired output on the console.

App.java:

package org.vishnu;

public class App {

    public static void main(String[] args)
    {
        System.out.println("Hello World.");
    }
}

Output: