Spring Boot tutorial

# Download Gradle binary-only
wget https://services.gradle.org/distributions/gradle-5.0-bin.zip

# Unpack the distribution
sudo mkdir /opt/gradle
unzip -d /opt/gradle gradle-5.0-bin.zip

# Configure your system environment
export PATH=$PATH:/opt/gradle/gradle-5.0/bin

# Verify your installation
gradle -v

Create project directory src/main/java/hello

mkdir -p src/main/java/hello

Create build gradle settings build.gradle (example with sublime text editor)

subl build.gradle

Add content

buildscript {
    repositories {
        mavenCentral()
    }
    dependencies {
        classpath("org.springframework.boot:spring-boot-gradle-plugin:2.0.5.RELEASE")
    }
}

apply plugin: 'java'
apply plugin: 'eclipse'
apply plugin: 'idea'
apply plugin: 'org.springframework.boot'
apply plugin: 'io.spring.dependency-management'

bootJar {
    baseName = 'gs-spring-boot'
    version =  '0.1.0'
}

repositories {
    mavenCentral()
}

sourceCompatibility = 1.8
targetCompatibility = 1.8

dependencies {
    compile("org.springframework.boot:spring-boot-starter-web")
    testCompile("junit:junit")
}

Create class HelloController (example with sublime text editor)

subl src/main/java/hello/HelloController.java

Add content

package hello;

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

@RestController
public class HelloController {

    @RequestMapping("/")
    public String index() {
        return "Greetings from Spring Boot!\n";
    }

}

Create class Application (example with sublime text editor)

subl src/main/java/hello/Application.java

Add content

package hello;

import java.util.Arrays;

import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.Bean;

@SpringBootApplication
public class Application {

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

    @Bean
    public CommandLineRunner commandLineRunner(ApplicationContext ctx) {
        return args -> {

            System.out.println("Let's inspect the beans provided by Spring Boot:");

            String[] beanNames = ctx.getBeanDefinitionNames();
            Arrays.sort(beanNames);
            for (String beanName : beanNames) {
                System.out.println(beanName);
            }

        };
    }

}

Run Gradle build

gradle build && java -jar build/libs/gs-spring-boot-0.1.0.jar

Wait to build the project...

Run:

curl localhost:8080

See result

Greetings from Spring Boot!

Barbalho12/spring-boot-guide

Spring Boot tutorial