In this article, we will apprentice how to advance a simple “Hello World!” web appliance that highlights some of Bounce Boot’s key features. We use Maven to anatomy this activity back best IDEs abutment it.
We use the latest release of Bounce Cossack 2.0.5.RELEASE which requires Java 8 or 9, Bounce Framework 5.0.9.RELEASE or aloft and Adjudicator 3.2 .
Let’s get started with our cold is to anatomy a RESTful web account appliance Bounce Cossack 2.
We’ll anatomy a account that will acquire HTTP GET requests at:
and acknowledge with a JSON representation of a greeting:
We can adapt the greeting with an alternative name constant in the concern string:
The name constant amount overrides the absence amount of “World” and is reflected in the response:
Let me account accoutrement and technologies that we will use to advance RESTFul web casework appliance Bounce Cossack 2.
Spring Cossack — 2.0.5.RELEASE
JDK — 1.8 or later
Spring Framework — 5.0.9 RELEASE
Maven — 3.2
IDE — Eclipse or Bounce Tool Suite (STS)
There are abounding means to actualize a Bounce Cossack application. The simplest way is to use Bounce Initializr at http://start.spring.io/, which is an online Bounce Cossack appliance generator.
Refer aloft diagram and access the appropriate fields like Group, Artifact, baddest dependencies etc and click on Accomplish Activity on will accomplish a bounce cossack activity and downloads it. Next, Unzip the downloaded zip book and acceptation it into your admired IDE.
Following is the packing anatomy of this appliance for your reference-
Let’s accept pom.xml aboriginal and again we will alpha autograph cipher to advance RESTFul API.
From aloft pom.xml, let’s accept few important bounce cossack features.
The Bounce Cossack Adjudicator plugin provides abounding acceptable features:
It collects all the jars on the classpath and builds a single, runnable “über-jar”, which makes it added acceptable to assassinate and carriage your service.
It searches for the accessible changeless abandoned main() adjustment to banderole as a runnable class.
It provides a congenital annex resolver that sets the adaptation cardinal to bout Bounce Cossack dependencies. You can override any adaptation you wish, but it will absence to Boot’s called set of versions.
All Bounce Cossack projects about use spring-boot-starter-parent as the ancestor in pom.xml.
Parent Poms acquiesce you to administer the afterward things for assorted adolescent projects and modules:
To apperceive added how Bounce Cossack Starter Ancestor works on Overview of Bounce Cossack Starter Ancestor
Now that we’ve set up the activity and anatomy system, we can actualize your web service. The account will handle GET requests for /greeting, optionally with a name constant in the concern string. The GET appeal should acknowledgment a 200 OK acknowledgment with JSON in the anatomy that represents a greeting. It should attending commodity like this:
The id acreage is a different identifier for the greeting, and agreeable is the textual representation of the greeting.
To archetypal the greeting representation, you actualize a ability representation class. Provide a apparent old java commodity with fields, constructors, and accessors for the id and agreeable data:
Next, we actualize the ability ambassador that will serve these greetings.
In Spring’s access to architecture RESTful web services, HTTP requests are handled by a controller. These apparatus are calmly articular by the @RestController annotation, and the GreetingController beneath handles GET requests for /greeting by abiding a new instance of the Greeting class:
The @RequestMapping comment ensures that HTTP requests to /greeting are mapped to the greeting() method.
The aloft archetype does not specify GET vs. PUT, POST, and so forth, because of @RequestMapping maps all HTTP operations by default. Use @RequestMapping(method=GET) to attenuated this mapping.
@RequestParam binds the amount of the concern cord constant name into the name constant of the greeting() method. If the name constant is absent in the request, the defaultValue of “World” is used.
Although it is accessible to amalgamation this account as a acceptable WAR book for deployment to an alien appliance server, the simpler access approved beneath creates a standalone application. You amalgamation aggregate in a single, executable JAR file, apprenticed by a acceptable old Java main() method. Along the way, you use Spring’s abutment for embedding the Tomcat servlet alembic as the HTTP runtime, instead of deploying to an alien instance.
Spring cossack offers abounding means to arrange and run Bounce cossack applications. You can apprentice on Different Means of Active Bounce Cossack Application.
@SpringBootApplication is a accessibility comment that adds all of the following:1. @Configuration tags the chic as a antecedent of bean definitions for the appliance context.2. @EnableAutoConfiguration tells Bounce Cossack to alpha abacus beans based on classpath settings, added beans, and assorted acreage settings.2. @ComponentScan tells Bounce to attending for added components, configurations, and casework in the accost package, acceptance it to acquisition the controllers.
The main() method uses Bounce Boot’s SpringApplication.run() method to barrage an application. Did you apprehension that there wasn’t a distinct band of XML? No web.xml book either. This web appliance is 100% authentic Java and you didn’t accept to accord with configuring any accouterments or infrastructure.
Usually, we can alpha the standalone Bounce cossack appliance by adjudicator command or from IDE.
1. From the basis agenda of the appliance and blazon the afterward command to run it –
2. From your IDE, run the SpringbootHelloworldApplication.main() adjustment as a standalone Java chic that will alpha the anchored Tomcat server on anchorage 8080 and point the browser to http://localhost:8080/.
Now, our appliance is up and running, it’s time to analysis the service.
Now that the account is up, appointment http://localhost:8080/greeting, area you see:
Provide a name concern cord constant with http://localhost:8080/greeting?name=User. Apprehension how the amount of the agreeable aspect changes from “Hello, World!” to “Hello User!”:
That’s all, congratulations! You’ve aloof developed a RESTful web account with the latest absolution of Bounce Cossack 2.0.5 RELEASE.
This is a simple web application, to apprentice how to advance CRUD RESTFul API on Spring Cossack 2 Hibernate 5 MySQL CRUD REST API Tutorial
Learn how to do CRUD RESTFul APIs custom validation on Spring Cossack CRUD REST APIs Validation Example
Check out how to handle exceptions in Bounce cossack 2 REST API on Spring Cossack 2 Exception Handling for REST APIs.
Thanks for reading, achievement you enjoyed account this article. Happy learning, and accumulate coding!
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