我有一个任务和条件：该服务应在HTTP接口接收数据，将其存储在SQL数据库中，并通过HTTP接口使其可用。如果我理解正确，那么在我的服务层中，我应该使用@HttpExchange，@GetExchange等。注解。在我看到的所有youtube视频中，所有人都写了一个没有业务逻辑的封闭服务，并将此逻辑放在控制器部分。使用HTTP接口的正确方法是什么？还是将业务逻辑放在服务层更合适？
我的服务

@HttpExchange("/transactions")
public interface TransactionClient {
    @GetExchange
    List<Transaction> findAll();

    @GetExchange("/{id}")
    Transaction findOne(@PathVariable Integer id);

    @PostExchange
    ResponseEntity<HttpStatus> saveTransaction(@RequestBody Transaction transaction);

    @PatchExchange("/{id}")
    void updateTransaction(@RequestBody Transaction transaction, @PathVariable Integer id);

    @DeleteExchange("/{id}")
    void deleteTransaction(@PathVariable Integer id);
}

我的控制器

@RestController
@Transactional(readOnly = true)
@RequestMapping("/transactions")
public class TransactionController {
    private final TransactionRepository transactionRepository;

    @Autowired
    public TransactionController(TransactionRepository transactionRepository) {
        this.transactionRepository = transactionRepository;
    }

    @GetMapping
    public List<Transaction> findAll() {
        return transactionRepository.findAll();
    }

    @GetMapping("/{id}")
    public Transaction findOne(@PathVariable("id") Integer id) {
        return transactionRepository.findById(id).orElse(null);
    }

    @Transactional
    @PostMapping
    public ResponseEntity<HttpStatus> saveTransaction(@RequestBody Transaction transaction) {
        transaction.setDateOfTransaction(new Timestamp(System.currentTimeMillis()));
        transactionRepository.save(transaction);
        return ResponseEntity.ok(HttpStatus.OK);
    }

    @Transactional
    @PatchMapping("/{id}")
    public void updateTransaction(@RequestBody Transaction transaction, @PathVariable("id") Integer id) {
        Transaction transactionFromDb = transactionRepository.findById(id).orElse(null);
        transaction.setId(id);
        transaction.setDateOfTransaction(transactionFromDb.getDateOfTransaction());
        transactionRepository.save(transaction);
    }

    @DeleteMapping("/{id}")
    @Transactional
    public void deleteTransaction(@PathVariable("id") Integer id) {
        transactionRepository.deleteById(id);
    }
}

我在youtube上看了很多视频，但是他们把逻辑放在控制器里，对吗？