我知道我可以使用@GetMapping和Spring控制器来公开一个RESTFUL端点。例如：

@Controller
@ResponseBody
class CustomerRestController {

  private final CustomerService cs;

  CustomerRestController(CustomerService cs) {
    this.cs = cs;
  }

  @GetMapping("/customers")
  Collection<Customer> get() {
    return this.cs.getCustomers();
  }
}

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现在我想知道如何在不使用注解的情况下实现相同的功能。例如，考虑以下代码：

public static void main(String[] args) throws SQLException {
    var edb = new EmbeddedDatabaseBuilder()
        .setType(EmbeddedDatabaseType.H2)
        .build();

    var cs = new CustomerService(edb);
    var customers = cs.getCustomers();
    
    // Now I want to expose the list of customers as a RESTFUL endpoint.
  }

型