我的Web應(yīng)用程序存在一個(gè)小問(wèn)題：一個(gè)與spring boot API連接的angular2應(yīng)用程序。我無(wú)法從angular2應(yīng)用訪問(wèn)我的請(qǐng)求。我收到此錯(cuò)誤：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代碼：@RestController@RequestMapping(value = "/deliveryMan")@CrossOriginpublic 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@ComponentScanpublic class MyApp{    public static void main(String[] args) {        SpringApplication.run(MyApp.class, args);    }}angular2代碼：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);}為了解決該問(wèn)題，我在控制器類中添加了@CrossOrigin。它解決了getAll方法的問(wèn)題，但沒(méi)有解決其他方法的問(wèn)題。如何解決它，以便我可以使用PUT方法而不會(huì)出現(xiàn)此錯(cuò)誤？