Spring Boot In Action !new! «10000+ EXTENDED»

@Component @RabbitListener(queues = "order.queue") public class OrderListener { @RabbitHandler public void handleOrder(Order order) { System.out.println("Received order: " + order.getId()); } } File Upload @PostMapping("/upload") public ResponseEntity<String> handleUpload(@RequestParam("file") MultipartFile file) throws IOException { Path path = Paths.get("uploads/" + file.getOriginalFilename()); Files.write(path, file.getBytes()); return ResponseEntity.ok("File uploaded successfully"); } // Async file processing @Async public CompletableFuture<String> processFile(MultipartFile file) { // Process large files asynchronously } 14. Error Handling Global Exception Handler @RestControllerAdvice public class GlobalExceptionHandler { @ExceptionHandler(MethodArgumentNotValidException.class) @ResponseStatus(HttpStatus.BAD_REQUEST) public Map<String, String> handleValidation(MethodArgumentNotValidException ex) { return ex.getBindingResult().getFieldErrors().stream() .collect(Collectors.toMap( FieldError::getField, FieldError::getDefaultMessage )); }

@Service public class EmailService { @Async public CompletableFuture<Void> sendEmail(String to, String content) { // Simulate email sending return CompletableFuture.completedFuture(null); } } RabbitMQ @Configuration public class RabbitConfig { @Bean public Queue queue() { return new Queue("order.queue", false); } @Bean public TopicExchange exchange() { return new TopicExchange("order.exchange"); } } spring boot in action

@Override public void addInterceptors(InterceptorRegistry registry) { registry.addInterceptor(new LoggingInterceptor()) .addPathPatterns("/api/**"); } } @RestController public class ReactiveUserController { @GetMapping("/flux/users") public Flux<User> getAllReactive() { return userReactiveRepository.findAll() .delayElements(Duration.ofSeconds(1)); } @Component @RabbitListener(queues = "order

@CacheEvict(value = "users", key = "#user.id") public User update(User user) { return userRepository.save(user); } return ResponseEntity.ok("File uploaded successfully")

@Test @Transactional @Rollback void databaseTest() { // Rollback after test } } @DataJpaTest class UserRepositoryTest { @Autowired private TestEntityManager entityManager; @Autowired private UserRepository repository; }