Building an Application with Spring Boot

Category : Spring Boot | Sub Category : Spring Boot | By Prasad Bonam Last updated: 2023-07-09 06:40:41 Viewed : 304

Building an Application with Spring Boot:

Here is a simple example of a Spring Boot application with a RESTful API:

javaCopy code
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RestController;

@SpringBootApplication
public class MyApplication {
    public static void main(String[] args) {
        SpringApplication.run(MyApplication.class, args);
    }
}

@RestController
public class UserController {
    @GetMapping("/users/{id}")
    public User getUser(@PathVariable Long id) {
        // Logic to retrieve user from database
        User user = userRepository.findById(id);
        return user;
    }
    
    @PostMapping("/users")
    public User createUser(@RequestBody User user) {
        // Logic to save user to database
        User savedUser = userRepository.save(user);
        return savedUser;
    }
}

public class User {
    private Long id;
    private String name;
    private String email;

    // Getters and setters
    // Constructors
}

In this example, we have a MyApplication class annotated with @SpringBootApplication. It serves as the main entry point for the Spring Boot application.

The UserController class is annotated with @RestController, indicating that it handles RESTful API requests. It contains two methods: getUser() and createUser(). The getUser() method handles a GET request to retrieve a user by their ID, while the createUser() method handles a POST request to create a new user.

The User class represents a user entity with id, name, and email properties.

When the application is run, it starts a Spring Boot server, and you can access the RESTful APIs provided by the UserController class at the defined endpoints.

This is a basic example to illustrate the structure of a Spring Boot application with a RESTful API. In a real-world scenario, you would typically have additional components like a service layer, data access layer, and more complex business logic.