The Spring Boot CLI is a great tool for quickly bootstrapping Spring applications. It allows you to create stand-alone Spring-based applications that can be run from the command line without the need for a web server.
In this post, we'll take a look at how to customize the Spring Boot CLI for advanced development. We'll cover how to install the CLI, how to create and run Spring Boot applications, and how to customize the CLI for your own development needs.
The Spring Boot CLI is a command-line tool that can be used to quickly create and run Spring Boot applications. It is available as a standalone executable JAR file or as a Homebrew package.
To install the Spring Boot CLI, first download the latest version of the CLI from the Spring Boot website. Then, unzip the downloaded file and add the spring-boot-cli/bin
directory to your PATH
.
Alternatively, if you are using Homebrew, you can install the Spring Boot CLI by running the following command:
$ brew tap pivotal/tap
$ brew install springboot
Now that we have the Spring Boot CLI installed, let's create a simple Spring Boot application. We'll start by creating a new directory for our project:
$ mkdir my-app
$ cd my-app
Next, we'll create a new file called application.properties
in our project directory. This file will contain our Spring Boot application's configuration. We'll set the spring.main.banner-mode
property to off
so that the Spring Boot banner is not displayed when our application is run:
spring.main.banner-mode=off
Now, we can create our Spring Boot application. We'll use the spring
command to create a new @SpringBootApplication
class:
$ spring init -n com.example.myapp -d web my-app.jar
This will create a new my-app.jar
file in our project directory. We can run our application by executing the following command:
$ java -jar my-app.jar
Our application will start up and be accessible at http://localhost:8080
.
The Spring Boot CLI provides a number of options for customizing its behavior. These options can be specified either on the command line or in the spring
configuration file.
The spring
configuration file is a YAML file that is read by the Spring Boot CLI when it starts up. This file can be used to specify options for the spring
command, such as the default project directory and the default package name.
To create a spring
configuration file, create a new file called .spring-configuration.yaml
in your home directory. The contents of this file will be read by the Spring Boot CLI when it starts up.
Here is an example spring
configuration file:
spring:
project:
default-project-dir: ~/projects
package:
default-package-name: com.example
This file sets the default project directory to ~/projects
and the default package name to com.example
.
Now, when we create a new Spring Boot application, the spring
command will use these defaults:
$ spring init my-app
This will create a new Spring Boot application in the ~/projects/my-app
directory with a com.example
package name.
We can also specify options on the spring
command line. For example, we can use the --project-dir
option to set the project directory:
$ spring init --project-dir=~/my-app my-app
This will create a new Spring Boot application in the ~/my-app
directory.
In this post, we've looked at how to customize the Spring Boot CLI for advanced development. We've covered how to install the CLI, how to create and run Spring Boot applications, and how to customize the CLI for your own development needs.