How to Run Your First Spring Boot Application in IntelliJ?

IntelliJ IDEA simplifies Spring Boot development, making it a favorite among Java developers. Its convention-over-configuration approach minimizes boilerplate code, allowing developers to focus on business logic. This tutorial demonstrates two methods for creating and running a basic Spring Boot application within IntelliJ IDEA.

This powerful IDE facilitates project creation with necessary dependencies and importing existing Spring Boot projects. Before beginning, ensure you have:

• A Java Development Kit (JDK) installed.
• IntelliJ IDEA installed and configured.
• Basic understanding of Java and Spring concepts.

Setting Up Your Spring Boot Project in IntelliJ IDEA

Step 1: IntelliJ IDEA Installation

1. Visit the IntelliJ IDEA website: https://www.php.cn/link/e8cb5f581442030021d62fd780fa674d
2. Click the "Download" button.
3. Select your preferred edition (Community or Ultimate).
4. Download and install, following on-screen instructions.
5. Launch IntelliJ IDEA and complete the initial setup.

Step 2: Project Generation using Spring Initializr

1. Navigate to the Spring Initializr website: https://www.php.cn/link/bafd1b75c5f0ceb81050a853c9faa911
2. Specify project details:
   • Select your Spring Boot version.
   • Enter a Group name.
   • Enter an Artifact name (e.g., newProject).
   • Choose required dependencies (e.g., Spring Web).
3. Click "Generate" to download the project as a ZIP file.

Step 3: Creating and Configuring the Spring Boot Project

There are two approaches: using Spring Initializr or creating a Maven project directly in IntelliJ.

Approach 1: Using Spring Initializr

1. Open the downloaded ZIP file in IntelliJ IDEA.
2. Create a controller package under newProject -> src/main/java.
3. Create a class ExampleC within the controller package.

4. Add the following code to ExampleC, ensuring you import necessary annotations:

package org.example.controller;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.ResponseBody;

@Controller
public class ExampleC {
   @RequestMapping("/firstApp")
   @ResponseBody
   public String firstSpringApp(){
      return "Welcome!";
   }
}

Approach 2: Creating a Maven Project in IntelliJ

1. Create a new Maven project in IntelliJ.
2. Add the following dependencies to your pom.xml within the <dependencies> tag:

package org.example.controller;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.ResponseBody;

@Controller
public class ExampleC {
   @RequestMapping("/firstApp")
   @ResponseBody
   public String firstSpringApp(){
      return "Welcome!";
   }
}

3. Update Maven configuration (install phase).

4. Add the @SpringBootApplication annotation to your main application class.

5. Add SpringApplication.run(Main.class, args); to your main method.

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter</artifactId>
        <version>2.5.3</version>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
        <version>2.5.3</version>
    </dependency>
</dependencies>

6. Create the ExampleC controller class as described in Approach 1.

Step 4: Running the Application

Click the green "Run" button in the toolbar. The console will display Tomcat startup information (port 8080).

Step 5: Viewing the Result

Access the application via your browser at http://localhost:8080/firstApp. You should see "Welcome!".

Conclusion

IntelliJ IDEA significantly simplifies Spring Boot application development. Whether using Spring Initializr or a manual Maven setup, the process is streamlined, enabling efficient creation of robust and scalable applications. Leverage IntelliJ IDEA's features alongside Spring Boot's convention-over-configuration for optimal development.

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