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How to create a basic application in Java Spring Boot

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Spring Boot is the most popular Java framework that is used for developing RESTful web applications. In this article, we will see how to create a basic Spring Boot application.
Spring Initializr is a web-based tool using which we can easily generate the structure of the Spring Boot project. It also provides various different features for the projects expressed in a metadata model. This model allows us to configure the list of dependencies that are supported by JVM. Here, we will create the structure of an application using Spring Initializr and then use an IDE to create a sample GET route.

Therefore, to do this, the following steps are followed: 

Step 1: Go to Spring Initializr

Fill in the details as per the requirements. For this application: 

Project: Maven
Language: Java
Spring Boot: 3.1.5
Packaging: JAR
Java: 17
Dependency: Spring Web
IDE: IntelliJ IDEA

NOTE: For creating a simple application in Java Spring Boot we can import our code directly into various IDEs:

  • Spring Tool Suite(STS)
  • IntelliJ IDEA
  • VSCode

Here, we have used IntelliJ IDEA for creating a basic Spring Boot application

Step 2: Specify Group Id and Artifact Id. Here we have provided the Group name as “com.gfg” and the Artifact ID as “Spring Boot app”.
Step 3: Click on Generate which will download the starter project. 

Spring-Initializr

Step 4: Extract the zip file. Now open a suitable IDE and then go to File->New->Project from existing sources->Spring-boot-app and select pom.xml. Click on import changes on prompt and wait for the project to sync. 

importing_spring_project

Note: In the Import Project for Maven window, make sure you choose the same version of JDK which you selected while creating the project.

Step 5: Go to src->main->java->com.gfg.Spring.boot.app, create a java class with name as Controller and add the annotation @RestController. Now create a GET API as shown below:
 

Java

@RestController
public class Controller {
  
    // One syntax to implement a
    // GET method
    @GetMapping("/")
    public String home()
    {
        String str
            = "<html><body><font color=\"green\">"
              + "<h1>WELCOME To GeeksForGeeks</h1>"
              + "</font></body></html>";
        return str;
    }
  
    // Another syntax to implement a
    // GET method
    @RequestMapping(
        method = { RequestMethod.GET },
        value = { "/gfg" })
  
    public String info()
    {
        String str2
            = "<html><body><font color=\"green\">"
              + "<h2>GeeksForGeeks is a Computer"
              + " Science portal for Geeks. "
              + "This portal has been "
              + "created to provide well written, "
              + "well thought and well explained "
              + "solutions for selected questions."
              + "</h2></font></body></html>";
        return str2;
    }
}

                    

Step 6: This application is now ready to run. Run the SpringBootAppApplication class and wait for the Tomcat server to start. 

output_screen

Note: The default port of the Tomcat server is 8080 and can be changed in the application.properties file.

Step 7: Now go to the browser and enter the URL localhost:8080. Observe the output and now do the same for localhost:8080/gfg

Output 

On running the above application, the following output is generated: 

Conclusion

By following the above steps, we have created a simple RESTful route with some message in it. In order to make a more complex application, more RESTful routes are added to perform the CRUD operations on the server.



Last Updated : 08 Nov, 2023
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