Spring Boot is a popular Java framework for developing web applications. It makes it easy to create stand-alone, production-grade Spring-based applications that you can "just run."
In this post, we'll go over how to develop and deploy a Spring Boot application using Gradle. We'll start by setting up our project, then we'll write our code and package it into a jar file. Finally, we'll deploy our application to a server.
The first thing we need to do is set up our project. We'll create a new directory for our project and initialize a Gradle build script.
$ mkdir my-spring-boot-app
$ cd my-spring-boot-app
$ gradle init
Next, we need to add the Spring Boot dependency to our build script. We'll do this by adding the following line to our build.gradle
file:
dependencies {
compile 'org.springframework.boot:spring-boot-starter-web'
}
Now that our project is set up, we can start writing our code. We'll create a simple Spring Boot application that prints "Hello, world!"
First, we'll create a file called HelloWorldController.java
in our src/main/java
directory. This file will contain our controller:
package com.example.myapp;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class HelloWorldController {
@RequestMapping("/")
public String index() {
return "Hello, world!";
}
}
Next, we'll create a file called Application.java
in our src/main/java
directory. This file will contain our main application class:
package com.example.myapp;
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);
}
}
Now that our code is written, we need to package it into a jar file. We can do this by running the gradle build
command. This will create a jar file in our build/libs
directory.
Now that our application is packaged, we can deploy it to a server. We'll use the java -jar
command to run our jar file:
$ java -jar build/libs/my-spring-boot-app.jar
Our application will start up on port 8080. We can access it by going to http://localhost:8080 in our browser.
In this post, we've gone over how to develop and deploy a Spring Boot application using Gradle. We've set up our project, written our code, packaged it into a jar file, and deployed it to a server.