Spring Boot REST API Tutorial

Introduction

Spring Boot accelerates Java API development with auto-configuration and embedded servers.

Controller

@RestController
@RequestMapping("/api/users")
public class UserController {
    private final UserService userService;

    @GetMapping("/{id}")
    public ResponseEntity<User> getUser(@PathVariable Long id) {
        return userService.findById(id)
            .map(ResponseEntity::ok)
            .orElse(ResponseEntity.notFound().build());
    }
}

Conclusion

Add Spring Security and OpenAPI documentation for production APIs.