我的Web应用程序上有一个小问题：一个与spring boot API连接的angular2应用程序。

我无法从angular2应用访问我的请求。我收到此错误：

Failed to load http://localhost:8080/deliveryMan/: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:4200' is therefore not allowed access.

Java代码：

@RestController
@RequestMapping(value = "/deliveryMan")
@CrossOrigin
public class DeliveryManController {

    @Autowired
    DeliveryManService deliveryManService;

    @RequestMapping(value = "/getAllDeliveryMan", method = RequestMethod.GET)
    public Iterable<DeliveryMan> getAllDeliveryMan(){
        return deliveryManService.findAll();
    }

    @RequestMapping(method = RequestMethod.PUT, consumes = "application/json")
    public DeliveryMan addDeliveryMan(@RequestBody DeliveryMan deliveryMan) throws InvalidObjectException {
        deliveryManService.save(deliveryMan);
        return deliveryMan;
    }

@SpringBootApplication
@EnableAutoConfiguration
@ComponentScan
public class MyApp{

    public static void main(String[] args) {
        SpringApplication.run(MyApp.class, args);
    }
}

angular2代码：

private apiUrl = 'http://localhost:8080/deliveryMan/';

getAll(): Promise<DeliveryMan[]> {
  const url = this.apiUrl + 'getAllDeliveryMan';
  return this.http.get(url)
    .toPromise()
    .then(response => response.json().data as DeliveryMan[])
    .catch(this.handleError);
}

saveDeliveryMan(deliveryMan: DeliveryMan): Promise<DeliveryMan> {
  const url = this.apiUrl;
  return this.http.put(url, JSON.stringify(deliveryMan), this.headers)
    .toPromise()
    .then(() => deliveryMan)
    .catch(this.handleError);
}

为了解决该问题，我在控制器类中添加了@CrossOrigin。它解决了getAll方法的问题，但没有解决其他方法的问题。

如何解决它，以便我可以使用PUT方法而不会出现此错误？