REST API in spring boot

Category : Spring Boot | Sub Category : Spring Boot | By Prasad Bonam Last updated: 2023-07-11 08:56:28 Viewed : 727

REST API in spring boot:

To build a REST API using Spring Boot, you can follow these steps:

Step 1: Set up a Spring Boot Project Create a new Spring Boot project using your preferred IDE or Spring Initializr. Make sure to include the necessary dependencies, such as spring-boot-starter-web, which provides support for building web applications.

Step 2: Create a Controller Create a new Java class annotated with @RestController to define your API endpoints. Each endpoint is represented by a method within the controller class, and you can use various annotations to specify the HTTP method, request mapping, and request/response formats. For example:

javaCopy code
@RestController
@RequestMapping("/api")
public class MyController {

    @GetMapping("/hello")
    public String sayHello() {
        return "Hello, World!";
    }

    @PostMapping("/user")
    public ResponseEntity<User> createUser(@RequestBody User user) {
        // Logic to create a user
        return ResponseEntity.ok(user);
    }
}

In the above example, the /api/hello endpoint responds with "Hello, World!" when accessed with a GET request. The /api/user endpoint expects a POST request with a JSON payload representing a User object.

Step 3: Build and Run the Application Build the Spring Boot application and run it as a standalone Java application. The application will start an embedded web server and listen for incoming requests.

Step 4: Test the API Use a tool like cURL, Postman, or a web browser to test your API endpoints. For example, you can send a GET request to http://localhost:8080/api/hello to see the "Hello, World!" response.

Thats it! You have created a basic REST API using Spring Boot. You can expand upon this by adding more endpoints, incorporating data persistence with a database, implementing authentication and authorization, and handling more complex request/response scenarios. Spring Boot provides a rich ecosystem of libraries and features to support building robust and scalable RESTful applications.