Endpoint REST fi Spring Boot huwa metodu fuq @RestController, immappjat għal verb u path HTTP. @RestController = @Controller + @ResponseBody, allura l-valuri ta' ritorn jiġu serjalizzati direttament fil-body tar-response (JSON permezz ta' Jackson) minflok ma jiġu solvuti f'view.
@RestController
@RequestMapping("/api/users") // base path for every method below
public class UserController {
private final UserService service;
public UserController(UserService service) { this.service = service; }
@GetMapping("/{id}") // GET /api/users/42
public UserDto get(@PathVariable Long id) { // bind {id} from the URL
return service.findById(id); // returned object -> JSON
}
@PostMapping // POST /api/users
@ResponseStatus(HttpStatus.CREATED) // 201 instead of 200
public UserDto create(@Valid @RequestBody UserDto body) { // JSON -> object
return service.create(body);
}
@GetMapping // GET /api/users?role=admin
public List<UserDto> list(@RequestParam(required = false) String role) {
return service.findByRole(role);
}
}
Annotations ewlenin: @PathVariable jiġbed valur mill-path, @RequestParam jaqra parametru tal-query-string, u @RequestBody jiddeserjalizza l-payload JSON. Li żżid @Valid iqabbad il-Bean Validation (@NotNull, @Email…) fuq id-DTO deħlin qabel ma jaħdem il-metodu tiegħek.
@GetMapping("/{id}")
public ResponseEntity<UserDto> get(@PathVariable Long id) {
return service.find(id)
.map(ResponseEntity::ok) // 200 + body
.orElse(ResponseEntity.notFound().build()); // 404, no body
}
Dan huwa xogħol backend tal-ħobż u l-butir, allura l-intervistaturi jistennew ħeffa. Tweġibiet b'saħħithom isemmu l-użu ta' DTOs minflok li tesponi entitajiet JPA, il-validazzjoni tal-input b'@Valid, u r-ritorn ta' status codes korretti b'ResponseEntity — id-differenza bejn endpoint tal-ġugarell u API reali.
Librerija ta' mistoqsijiet ta' intervisti tal-IT b'tweġibiet dettaljati — minn Junior sa Senior.
Iddona