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Spring Boot Application Walkthrough

Pragya Keshap answered on February 24, 2023 Popularity 1/10 Helpfulness 1/10

answer Spring Boot Application Walkthrough

Spring Boot Application Walkthrough

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Next, let's have a look at the REST API of the sample application. This API is all about serving data about the User resource in a RESTful manner.

@RestController
@RequestMapping(value = "/api/users", produces = APPLICATION_JSON_VALUE)
public class UserController {

  private final UserService userService;

  public UserController(UserService userService) {
    this.userService = userService;
  }

  @GetMapping
  public List<User> getAllUsers() {
    return userService.getAllUsers();
  }

  @GetMapping("/{id}")
  public User getUserById(@PathVariable("id") Long id) {
    return userService
      .getUserById(id)
      .orElseThrow(() -> new UserNotFoundException(String.format("User with id [%s] not found", id)));
  }

  @PostMapping(consumes = APPLICATION_JSON_VALUE)
  public ResponseEntity<Void> createNewUser(@RequestBody @Validated User user, UriComponentsBuilder uriComponentsBuilder) {
    User addedUser = this.userService.addNewUser(user)
      .orElseThrow(() -> new UserAlreadyExistsException(
        String.format("User with id [%s] is already present", user.getId())));

    UriComponents uriComponents =
      uriComponentsBuilder.path("/api/users/{id}").buildAndExpand(addedUser.getId());

    return ResponseEntity.created(uriComponents.toUri()).build();
  }

  @DeleteMapping("/{id}")
  public void deleteUser(@PathVariable("id") Long id) {
    this.userService.deleteUserById(id);
  }
}

Popularity 1/10 Helpfulness 1/10 Language java

Source: Grepper

Tags: java spring-boot walkthrough

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Contributed on Feb 24 2023

Pragya Keshap

0 Answers Avg Quality 2/10

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