Understanding RestController

Any RESTful API needs to answer requests coming from their client; these requests are handled in Spring by a controller object. In this section, we will understand what a controller actually is and how the RestController will help us to create our first component in a RESTful API.

What is a controller

Each request coming to a RESTful API is a stateless message that mainly will:

• Ask for a resource
• Update a resource
• Create a resource
• Delete a resource

Those requests will use JSON as the mechanism to interchange information.

JavaScript Object Notation (JSON) is a human-readable data format to transmit objects. It is a language-independent data format, but it was derived from JavaScript. Most programming...