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Simple Spring Boot Example

In this tutorial, I am going to show you the most popular and trending module in Spring Framework that is Spring Boot. By this tutorials you can get to know how to write a Simple Spring Boot Example.

Used Technologies :

  • Spring 3.2.3
  • Spring Boot 1.5.1
  • Java 8
  • Maven 3

Spring Boot Example :

Here I am going to implement a basic hello world spring boot example.

Project Structure :

Spring Boot Example

Maven Dependencies :

To make our example as simple as possible, I have placed dependencies in pom.xml what just I want.


<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>org.springframework.samples</groupId>
    <artifactId>Spring_Boot_Example</artifactId>
    <version>0.0.1-SNAPSHOT</version>

    <properties>

        <!-- Generic properties -->
        <java.version>1.8</java.version>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>

        <!-- Spring -->
        <spring-framework.version>3.2.3.RELEASE</spring-framework.version>

    </properties>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.1.RELEASE</version>
    </parent>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

Create Application Class :


package com.onlinetutorialspoint.spring.boot;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class Application {
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }    
}

@SpringBootApplication annotation tells the spring application context, it is an spring boot application. Most of the developers can used to define the spring boot main classes with the @Configuration, @EnableAutoConfiguration and @ComponentScan annotations. Since these annotations are mandatory to every Spring application, the Spring Boot given us an annotation called @SpringBootApplication instead.

Here @Configuration + @EnableAutoConfiguration + @ComponentScan = @SpringBootApplication

Create a Controller Class :

HelloController.java


package com.onlinetutorialspoint.spring.boot;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class HelloController {
    @RequestMapping("/")
    public String index() {
        return "Hello World Spring !";
    }
}

Running the Spring Boot Example :

On e of the biggest advantage of Spring boot application is, to run we don’t deploy the application in any server. We can run the above spring boot example as a simple Java standalone application.

Run the main method in Application.java.

If every thing goes well, you can find the below text in your console.

Spring Boot Example out
Now it is time to show out hello message on browser.

Spring boot example output

Happy Learning 🙂

Download Example

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