Introduction to REST and Creating Your First REST Endpoint
Introduction
Welcome to the first lesson of the course, "Building RESTful APIs with Spring Boot." This is the second course in our series, and by now, you should be comfortable with concepts like Dependency Injection and Spring Beans. In this course, you'll learn how to build a simple REST API with Spring Boot. If you're unfamiliar with the term REST, don't worry; we’ll explain everything step by step. In this specific lesson, you'll get acquainted with REST, understand its benefits, and see how Spring Boot supports it. You'll also learn about a significant building block of Spring Boot called the controller, and you'll create your first one. Let's dive in!
What is REST?
REST stands for Representational State Transfer. Although it may sound complex, let’s simplify it with a digital recipe book as an example. In our digital recipe book, the most important aspect is the data—the recipes.
Resources in REST
Each recipe is a distinct piece of information that you can access, read, modify, or delete. For instance, "Chocolate Chip Cookies" or "Spaghetti Bolognese" are examples of resources within your digital recipe book. In a RESTful web service, resources are identified by URIs (Uniform Resource Identifiers), which act like addresses in your recipe book.
Examples:
/recipes/cookiescould point to the "Chocolate Chip Cookies" recipe./recipes/spaghetticould refer to the "Spaghetti Bolognese" recipe.
Representations of Resources
When you view or share a recipe, you're interacting with its representation. This could be a list of ingredients and instructions formatted in a specific way. For instance, requesting the "Chocolate Chip Cookies" recipe might yield:
The actual recipe resides on the server, but you work with its representation.
HTTP Methods in REST
In REST, you manage resources using various HTTP methods, which correspond to actions you want to take on the recipes:
- GET: Retrieve a specific recipe.
- Example:
GET /recipes/cookiesretrieves the "Chocolate Chip Cookies" recipe.
- Example:
- POST: Add a new recipe.
- Example:
POST /recipescould create a new recipe, like "Banana Bread."
- Example:
- PUT: Update an existing recipe.
- Example:
PUT /recipes/cookiesupdates the "Chocolate Chip Cookies" recipe.
- Example:
- DELETE: Remove a recipe.
- Example:
DELETE /recipes/cookiesremoves the "Chocolate Chip Cookies" recipe from your collection.
- Example:
