- Spring Boot Cli Tutorial
- Spring Boot Cli Download On Mac High Sierra
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- Spring Boot Cli
- Spring Boot Cli Download
Hello friends!!! Welcome again for another Spring Boot tutorial. Here we are going to discuss more detail about Spring Boot CLI (Command Line Interface). Previously we have already discussed Introduction of Spring Boot and Essentials Key Components of Spring Boot. The quickest way to get started with Spring Boot is to install the Spring Boot CLI so that you can start writing code.
Name Email Dev Id Roles Organization; Pivotal: infopivotal.io: Pivotal Software, Inc. SpringブートCLIをインストールすると、 springコマンドを使用して実行できます。 コマンドラインヘルプを表示するには: $ spring help 最初のSpringブートプロジェクトを作成して実行するには: $ spring init my-app $ cd my-app $ spring run my-app.
What is Spring Boot CLI?
The Spring Boot CLI is a command line tool that can be used if we want to quickly develop with Spring. It allows us to run Groovy scripts, which means that we have a familiar Java-like syntax, without so much boilerplate code. We can also bootstrap a new project or write your own command for it.
It is Spring Boot software to run and test Spring Boot applications from command prompt. When we run Spring Boot applications using CLI, then it internally uses Spring Boot Starter and Spring Boot AutoConfigurate components to resolve all dependencies and execute the application.
It internally contains Groovy and Grape (JAR Dependency Manager) to add Spring Boot Defaults and resolve all dependencies automatically.
Installing the Spring Boot CLI
There are several ways to install the Spring Boot CLI:
- From a downloaded distribution
- Using the Groovy Environment Manager
- With OS X Homebrew
- As a port using MacPorts
MANUALLY INSTALLING THE SPRING BOOT CLI
We can install Spring Boot CLI software using either Windows Installer or Zip file. Both approaches are easy to install and will give us same Spring Boot CLI software.
Step 1: You can download the Spring CLI distribution from the Spring software repository:
Once downloaded, follow the INSTALL.txt instructions from the unpacked archive. In summary: there is a spring script (spring.bat for Windows) in a bin/ directory in the .zip file, or alternatively you can use java -jar with the .jar file (the script helps you to be sure that the classpath is set correctly).
Spring Boot Cli Tutorial
Step 2: Extract spring-boot-cli-1.4.0.BUILD-SNAPSHOT-bin.zip file into our local FileSystem.
Step 3: Set Spring Boot CLI Environment Variables in Windows System as shown below.
Step 4: Execute the below command to verify our installation process.
Once you have installed the CLI you can run it by typing spring.
We can use “spring –version” to know the Spring Boot CLI Version as shown below.
We can use “spring –help” to know the Spring Boot CLI Version as shown below.
Now our Spring Boot CLI Installation process is done successfully.
Quick start Spring Boot CLI Hello World Example
Here we are using same example provided in Spring Boot Documentation.
Please follow the following steps to develop a Spring Boot HelloWorld Example:
Step 1: Create an “app” Folder in our Local FileSystem to place our groovy scripts.
To compile and run the application type:
To pass command line arguments to the application, you need to use a — to separate them from the “spring” command arguments, e.g.
To set JVM command line arguments you can use the JAVA_OPTS environment variable, e.g.
If we observe our app.groovy, we can find the following important points.
- No imports
- No other XML configuration to define Spring MVC Components like Views,ViewResolver etc.
- No web.xml and No DispatcherServlet declaration
- No build scripts to create our Application war file
- No need to build war file to deploy this application
Open command prompt at “app” Folder in our Local FileSystem.
Execute the following command
Observe the output at “spring run” command console.
If we observe here, when we execute “spring run app.groovy”, it starts Embedded Tomcat server at Default port number: 8080.
Now our Spring Boot HelloWorld Example application is up and running. It’s time to test it now.
- Open browser and access the following link.
- Access this URL: http://localhost:8080/
In the above example we can observe following points.
- There is no Import
- There is no XML or JAVA configuration
- There is no DispatcherServlet and web.xml
- There is no build file for creating war like Maven or Gradle
It is the responsibility of Spring Boot Core Components, Groovy Compiler (groovyc) and Groovy Grape (Groovy’s JAR Dependency Manager).
Spring Boot Components uses Groovy Compiler and Groovy Grape to provide some Defaults lime adding required imports, providing required configuration, resolving jar dependencies, adding main() method etc. As a Spring Boot Developer, We don’t need to worry all these things. Spring Boot Framework will take care of all these things for us.
That’s the beauty of Spring Boot Framework.
Default import statements
To help reduce the size of your Groovy code, several import statements are automatically included. Notice how the example above refers to @Component,@RestController and @RequestMapping without needing to use fully-qualified names or import statements.
Automatic main method
Unlike the equivalent Java application, you do not need to include a public static void main(String[] args) method with your Groovy scripts. ASpringApplication is automatically created, with your compiled code acting as the source.
Summary
The Spring Boot CLI takes the simplicity offered by Spring Boot auto-configuration and starter dependencies and turns it up a notch. Using the elegance of the Groovy language, the CLI makes it possible to develop Spring applications with minimal code noise.
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- Introduction to Spring Boot
Hello friends lets discuss another way to create spring boot project structure by using Spring Boot Initializr. Spring Boot Initializr is used to quick start new Spring Boot Maven/Gradle projects within no time. It generates initial project structure and builds scripts to reduce Development time.
As previous chapter we have seen following ways for Spring Boot Initialzr.
- Spring Boot Initilizr through Spring Boot CLI
Before starting discussion for this tutorial we have to go through my previous chapter (Spring Boot CLI installation and Hello World Example) for Basic and Installation guide for Spring Boot CLI. As in previous chapter we saw, the Spring Boot CLI is a great way to develop Spring applications by just writing code. However, the Spring Boot CLI also has a few commands that can help us use the Initializr to kick-start development on a more traditional Java project.
Spring Boot CLI provides a “spring init” command to bootstrap Spring Applications.
Syntax for Init Command:
Here “options” are command options and “location” is specified our file system location to create new Spring Boot Project.
Examples for Spring Init Command:
Example 1: Use default setting
After contacting the Initializr web application, the init command will conclude by downloading a demo.zip file with following default setting.
- Default Build tool is “maven”.
- Default Spring Initilizr service target URL: https://start.spring.io
- Default project name: “demo”
- Default maven type: “jar”
- Default only baseline starter dependencies for Spring Boot and testing
![Spring Spring](https://www.kleemans.ch/images/405.png)
Example 2: Using required dependencies on web project
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Let’s say you want to start out by building a web application that uses JPA for data persistence and that’s secured with Spring Security. You can specify those initial dependencies with either –dependencies or -d:
$ spring init –dweb, jpa, security
This will give you a demo.zip containing the same project structure as before, but with Spring Boot’s web, JPA, and security starters expressed as dependencies in pom.xml.
Example 3: Using required dependencies on web project with change Build (Maven to Gradle)
For Gradle
$ spring init –dweb, jpa, security –build maven (maven is default build type)
Example 4: Change packaging
By default, the build specification for both Maven and Gradle builds will produce an executable JAR file. If you’d rather produce a WAR file, you can specify so with the –packaging or -p parameter:
$ spring init –dweb, jpa, security –build gradle –p war
Example 5: Change application name
$ spring init –dweb, jpa, security –build gradle –p war myapp.zip
Example 6: Specifying the Java version to compile with, and selecting a version of Spring Boot
$ spring init –dweb, jpa, security –build gradle –java-version=1.7 –boot-version=1.3.0.RELEASE –p war myapp.zip
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Other more commands
We can discover all of the parameters by using the help command:
$ spring help init
For lists several parameters that are supported by the Initializr.
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spring init -l
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Whether we use Initializr’s web-based interface, create our projects from Spring Tool Suite, or use the Spring Boot CLI to initialize a project, projects created using the Spring Boot Initializr have a familiar project layout, not unlike other Java projects we may have developed before.
Spring Boot Related Topics